研究者詳細 - 三木　直子

論文 - 三木　直子

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Life history of Juniperus sabina L. adapted to the sand shifting environment in the Mu Us Sandy Land, China: A review 査読

Nobuhito Ohte, Naoko H. Miki, Naoko Matsuo, Lingli Yang, Muneto Hirobe, Norikazu Yamanaka, Yoshiaki Ishii, Ayumi Tanaka-Oda, Michiko Shimizu, Guosheng Zhang, Keiji Sakamoto, Linhe Wang, Ken Yoshikawa

Landscape and Ecological Engineering 2021年3月

Imperforate tracheary elements and vessels alleviate xylem tension under severe dehydration: insights from water release curves for excised twigs of three tree species 査読

Kenichi Yazaki, Delphis F. Levia, Akiko Takenouchi, Makoto Watanabe, Daisuke Kabeya, Naoko H. Miki, Haruhiko Taneda, Mayumi Y. Ogasa, Michio Oguro, Shin‐Taro Saiki, Hiroyuki Tobita, Kenji Fukuda

American Journal of Botany 107 ( 8 ) 1122 - 1135 2020年8月

Allelopathic effects of the revegetation species Juniperus sabina L. in semiarid areas of China 査読

Long Qin, Naoko H. Miki, Guosheng Zhang, Yoshiharu Fujii

Landscape and Ecological Engineering 2019年10月

Short-time xylem tension relaxation prevents vessel refilling and alleviates cryo-fixation artifacts in diffuse-porous Carpinus tschonoskii and Cercidiphyllum japonicum 査読

Mayumi Y Ogasa, Kenichi Yazaki, Yasuhiro Utsumi, Naoko H Miki, Kenji Fukuda

Tree Physiology 39 ( 10 ) 1685 - 1695 2019年10月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Oxford University Press (OUP)

<title>Abstract</title>
Xylem tension relaxation is an important procedure that closely resembles the in vivo xylem water distribution when measuring conductivity or observing water distribution of plant tissue samples by cryo-scanning electron microscopy (cryo-SEM). Recent studies have shown that partial xylem embolism occurs when samples under tension are cut under water and that gas-filled vessels are refilled during tension relaxation. Furthermore, the frequency of gas-filled vessels has been reported to increase in samples without tension relaxation before cryo-fixation by liquid nitrogen, particularly in samples with significant tension. Here, we examined the effect of tension relaxation on these artifacts in Carpinus tschonoskii and Cercidiphyllum japonicum using magnetic resonance imaging. We observed that xylem embolism rarely occurs in bench-dried samples cut under water. In both species, a small portion of the xylem was refilled within ~1 h after tension relaxation. Cryo-SEM observations revealed that short-time (&lt;1 h) xylem tension relaxation decreases the frequency of gas-filled vessels in samples frozen after xylem tension relaxation regardless of the water potential compared with that in samples frozen without rehydration in both species. Therefore, short-time tension relaxation is necessary to retain xylem water distribution during sample preparation against artifacts.

DOI： 10.1093/treephys/tpz072

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その他リンク： http://academic.oup.com/treephys/article-pdf/39/10/1685/31773009/tpz072.pdf

Stump sprout dynamics of Quercus serrata Thunb. and Q. acutissima Carruth. four years after cutting in an abandoned coppice forest in western Japan 査読

Tai Tien Dinh, Chihiro Kajikawa, Yasuaki Akaji, Kazuhiro Yamada, Tetsuya K. Matsumoto, Takushi Makimoto, Naoko H. Miki, Muneto Hirobe, Keiji Sakamoto

Forest Ecology and Management 435 45 - 56 2019年3月

Water movement via adventitious roots of the prostrate shrub Juniperus sabina in semiarid areas of China 査読

N.H. Miki, K. Sato, M. Aoki, L. Yang, N. Matsuo, G. Zhang, L. Wang, K. Yoshikawa

Acta Horticulturae 1222 137 - 146 2018年11月

Effects of soil nutrient conditions on water transport properties and recovery from severe drought stress in Pinus densiflora saplings 査読

Naoko H. Miki, Satoshi Sasaki, Lingli Yang, Mayumi Y. Ogasa

Journal of Forest Research 22 ( 3 ) 177 - 184 2017年5月

Effective Water Use and Growth of a Prostrate Lifeform Shrub, Juniperus Sabina, in Semiarid Areas of China 査読

H. MIKI Naoko, KUBORI Fumiaki, YANG Lingli, MATSUO Naoko, ZHANG Guosheng, WANG Linhe, YOSHIKAWA Ken

沙漠研究 26 ( 3 ) 95 - 99 2016年11月

担当区分：筆頭著者記述言語：英語出版者・発行元：日本沙漠学会

<p>Juniperus sabina L. is an evergreen shrub with prostrate life form that may effectively stabilize sand dunes and moving sand. Therefore, it serves as an important woody species for revegetation in semiarid areas of China. The main root system of J. sabina can reach deep into soil while adventitious roots mostly extend into surface soil. To evaluate water movement between different soil-layers these root systems that is associated with rainfall-induced vertical heterogeneity in soil moisture, we measured changes in sap flow and soil moisture content as well as atmospheric temperature and humidity. The patch radius of twenty-four patches was also measured for 7 years to monitor changes in growth rate. Nighttime sap flow between the main root system and adventitious roots during periods of no rainfall was measured; nighttime sap flow decreased or disappeared after rainfall. The annual growth rate of the patch radius was significantly correlated with the annual deposition rate of sand and the amount of annual precipitation. It was suggested that water movement occurs from the deeper moist soil layer to dry surface soil layer via the main root system and adventitious roots by hydraulic redistribution (HR). This movement increased with the progression of drought in the surface soil layer after a rain event. J. sabina can effectively use both subsoil water during periods of drought and rainwater in surface soil layer after an occasional rain event through the HR. This allows the plant to survive and continuously grow under water-limited conditions and in a mobile sand environment in semiarid areas.</p>

DOI： 10.14976/jals.26.3_95

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Erratum to: Water transport properties of seven woody species from the semi-arid Mu Us Sandy Land, China (Landscape and Ecological Engineering, DOI:10.1007/s11355-015-0290-2) 査読

Y. Murakami, N. H. Miki, L. Yang, G. Zhang, L. H. Wang, K. Yoshikawa

Landscape and Ecological Engineering 12 ( 2 ) 221 - 222 2016年7月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Springer-Verlag Tokyo

Unfortunately, the variable ab has changed globally as b in Table 2 and published incorrectly in the original publication of the article.The corrected Table 2 should read as given in this Erratum. The original article has also been updated.

DOI： 10.1007/s11355-016-0299-1

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Water transport properties of seven woody species from the semi-arid Mu Us Sandy Land, China 査読

Y. Murakami, N. H. Miki, L. Yang, G. Zhang, L. H. Wang, K. Yoshikawa

LANDSCAPE AND ECOLOGICAL ENGINEERING 12 ( 2 ) 209 - 220 2016年7月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：SPRINGER JAPAN KK

Maintenance of water transport is very important for plant growth and survival. We studied seven woody species that inhabit the semi-arid Mu Us Sandy Land, China, to understand their strategies for maintaining hydraulic function. We evaluated water transport properties, including cavitation resistance, hydraulic recovery, and water loss regulation by stomatal control, which are associated with xylem structural and leaf physiological traits. We also discussed the water-use characteristics of these species by comparing them with those of species in other regions. Species with tracheids had higher levels of xylem resistance to cavitation and a smaller midday transpiration rate than the other species studied. Although species with vessels were less resistant to cavitation, some recovered hydraulic conductivity within 12 h of rehydration. Species with xylem tracheids could maintain their hydraulic function through resistance to cavitation and by relaxing xylem tension. Although species with vessels had less resistant xylem, they could maintain hydraulic function through hydraulic recovery even when xylem dysfunction occurred. Additionally, the species studied here were less resistant to cavitation than species in semi-arid environments, and equally or less resistant than species in humid environments. Rather than allow hydraulic dysfunction due to drought-induced dehydration, they may develop water absorption systems to avoid or recover quickly from hydraulic dysfunction. Thus, not only stem cavitation resistance to drought but also stem-root coordination should be considered when selecting plants for the revegetation of arid regions.

DOI： 10.1007/s11355-015-0290-2

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Cutting stems before relaxing xylem tension induces artefacts in Vitis coignetiae, as evidenced by magnetic resonance imaging 査読

Mayumi Y. Ogasa, Yasuhiro Utsumi, Naoko H. Miki, Kenichi Yazaki, Kenji Fukuda

PLANT CELL AND ENVIRONMENT 39 ( 2 ) 329 - 337 2016年2月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：WILEY-BLACKWELL

It was recently reported that cutting artefacts occur in some species when branches under tension are cut, even underwater. We used non-destructive magnetic resonance imaging (MRI) to investigate the change in xylem water distribution at the cellular level in Vitis coignetiae standing stems before and after relaxing tension. Less than 3% of vessels were cavitated when stems under tension were cut under water at a position shorter than the maximum vessel length (MVL) from the MRI point, in three of four plants. The vessel contents remained at their original status, and cutting artefact vessel cavitation declined to <1% when stems were cut at a position farther than the MVL from the MRI point. Water infiltration into the originally cavitated vessels after cutting the stem, i. e. vessel refilling, was found in <1% of vessels independent of cutting position on three of nine plants. The results indicate that both vessel cavitation and refilling occur in xylem tissue under tension following stem cutting, but its frequency is quite small, and artefacts can be minimized altogether if the distance between the monitoring position and the cutting point is longer than the MVL.

DOI： 10.1111/pce.12617

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Vulnerability to cavitation differs between current-year and older xylem: non-destructive observation with a compact magnetic resonance imaging system of two deciduous diffuse-porous species. 査読国際誌

Kenji Fukuda, Daichi Kawaguchi, Tomo Aihara, Mayumi Y Ogasa, Naoko H Miki, Tomoyuki Haishi, Toshihiro Umebayashi

Plant, cell & environment 38 ( 12 ) 2508 - 18 2015年12月

記述言語：英語掲載種別：研究論文（学術雑誌）

Development of xylem embolism during water stress in two diffuse-porous hardwoods, Katsura (Cercidiphyllum japonicum) and Japanese white birch (Betula platyphylla var. japonica), was observed non-destructively under a compact magnetic resonance imaging (MRI) system in addition to conventional quantitation of hydraulic vulnerability to cavitation from excised stem segments. Distribution of white and dark areas in MR images corresponded well to the distribution of water-filled/embolized vessels observed by cryo-scanning electron microscopy in both species. Water-filled vessels were observed in MR images as white areas in Katsura and as white dots in Japanese white birch, respectively, and embolisms could be detected as a change to dark areas. The increase in the relative embolized area (REA: %) in the cross-sectional area of total xylem during water stress, which was estimated from the binarized MR images, was consistent with the hydraulic vulnerability curves of these species. From the non-destructive MRI observations, cavitation induced by water stress was shown to develop earlier in 1- or 2-year-old xylem than in the current-year xylem in both species; that is, the vulnerability to cavitation differs between vessels in the current-year xylem and those in older annual rings.

DOI： 10.1111/pce.12510

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Water loss regulation to soil drought associated with xylem vulnerability to cavitation in temperate ring-porous and diffuse-porous tree seedlings 査読

Mayumi Ogasa, Naoko H. Miki, Maria Okamoto, Norikazu Yamanaka, Ken Yoshikawa

TREES-STRUCTURE AND FUNCTION 28 ( 2 ) 461 - 469 2014年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：SPRINGER

Sustainable stomatal opening despite xylem cavitation occurs in ring-porous species and stomatal closure prior to cavitation in diffuse-porous species during soil drought.
To elucidate the relationship between water loss regulation and vulnerability to cavitation associated with xylem structure, stomatal conductance (g (s)), defoliation, vulnerability curves, and vessel features were measured on seedlings of ring-porous Zelkova serrata and Melia azedarach, and diffuse-porous Betula platyphylla var. japonica, Cerasus jamasakura and Carpinus tschonoskii. Under prolonged drought conditions, the percentage loss of hydraulic conductivity (PLC) increased and g (s) decreased gradually with decreasing predawn (I-pd) or xylem water potential (I-xylem) in Z. serrata. During the gentle increase of PLC in M. azedarach, g (s) increased in the early stages of dehydration while leaves were partly shed. A sharp reduction in g (s) was observed before the onset of an increase in the PLC for drying plants of the three diffuse-porous species, suggesting cavitation avoidance by stomatal regulation. In the ring-porous species, xylem-specific hydraulic conductivity (K (s)) was higher, whereas the vessel multiple fractions, the ratio of the number of grouped vessels to total vessels, was lower than that in the diffuse-porous species, suggesting that many were distributed as solitary vessels. This may explain the gradual increase in the PLC with decreasing I-xylem because isolated vessels provide less opportunity for air seeding. Different water loss regulation to soil drought was identified among the species, with potential mechanisms being sustainable gas exchange at the expense of xylem dysfunction or partial leaf shedding, and the avoidance of xylem cavitation by strict stomatal regulation. These were linked to vulnerability to cavitation that appears to be governed by xylem structural properties.

DOI： 10.1007/s00468-013-0963-0

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Contribution of Adventitious Roots to Water Use Strategy of Juniperus sabina in a Semiarid Area of China 査読

Yang, L, Miki, N. H, Matsuo, N, Zhang, G, Wang, L, Yoshikawa, K

Journal of Agricultural Science and Technology A 4 ( 3A ) 251 - 259 2014年

Recovery performance in xylem hydraulic conductivity is correlated with cavitation resistance for temperate deciduous tree species 査読

Mayumi Ogasa, Naoko H. Miki, Yuki Murakami, Ken Yoshikawa

TREE PHYSIOLOGY 33 ( 4 ) 335 - 344 2013年4月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：OXFORD UNIV PRESS

Woody species hydraulically vulnerable to xylem cavitation may experience daily xylem embolism. How such species cope with the possibility of accumulated embolism is unclear. In this study, we examined seven temperate woody species to assess the hypothesis that low cavitation resistance (high vulnerability to cavitation) is compensated by high recovery performance via vessel refilling. We also evaluated leaf functional and xylem structural traits. The xylem recovery index (XRI), defined as the ratio of xylem hydraulic conductivity in plants rewatered after soil drought to that in plants under moist conditions, varied among species. The xylem water potential causing 50% loss of hydraulic conductivity (Psi(50)) varied among the species studied, whereas only a slight difference was detected with respect to midday xylem water potential (Psi(min)), indicating smaller hydraulic safety margins (Psi(min) - Psi(50)) for species more vulnerable to cavitation. Cavitation resistance (vertical bar Psi(50)vertical bar) was negatively correlated with XRI across species, with cavitation-vulnerable species showing a higher performance in xylem recovery. Wood density was positively correlated with cavitation resistance and was negatively correlated with XRI. These novel results reveal that coordination exists between cavitation resistance and xylem recovery performance, in association with wood functional traits such as denser wood for cavitation-resistant xylem and less-dense but water-storable wood for refillable xylem. These findings provide insights into long-term maintenance of water transport in tree species growing under variable environmental conditions.

DOI： 10.1093/treephys/tpt010

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Changes of hydraulic conductivity during dehydration and rehydration in Quercus serrata Thunb. and Betula platyphylla var. japonica Hara: the effect of xylem structures 査読

Mayumi Ogasa, Naoko Miki, Ken Yoshikawa

TREE PHYSIOLOGY 30 ( 5 ) 608 - 617 2010年5月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：OXFORD UNIV PRESS

Xylem cavitation and its recovery were studied in 1-year-old stems of ring-porous Quercus serrata Thunb. and diffuse-porous Betula platyphylla var. japonica Hara. The Q. serrata had 5-100 mu m vessel diameter in the functional current xylem and 5-75 mu m in nonconducting 1-year-old xylem; B. platyphylla had a narrower range of vessel diameters of 5-55 mu m and more than double the number of vessels in both functional growth rings. Although hydraulic conductivity of Q. serrata appeared to decrease after release of moderate water stress of a half loss of native hydraulic conductivity-about -2 MPa in xylem water potential-no significant recovery of hydraulic conductivity was observed, probably because of intraspecific variation in vessel diameter distribution, which induced variable vulnerability to cavitation. Furthermore, in terms of xylem anatomy, larger and more efficient vessels of the current xylem did not show obvious refilling. In B. platyphylla, after release of water stress, rapid (1 h) recoveries of both hydraulic conductivity and water potential were apparent after rewatering: so-called 'novel refilling'. During that time, a high degree of vessel refilling was observed in both xylems. At 12 h after rewatering, embolized vessels of the current xylem had refilled completely, although about 20% of vessels were still embolized in 1-year-old xylem. This different pattern of vessel refilling in relation to xylem age for B. platyphylla might be attributable to structural faults in the 1-year-old xylem, such as pit degradation or perhaps xylem aging itself. Results show that Q. serrata performs water conduction using highly efficient large vessels instead of unclear vessel refilling. In contrast, B. platyphylla transports water via less efficient but numerous vessels. If cavitation occurs, B. platyphylla improves water conduction by increasing the degree of vessel refilling.

DOI： 10.1093/treephys/tpq011

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The Impact of Phenological Gaps on Leaf Characteristics and Foliage Dynamics of an Understory Dwarf Bamboo, Sasa kurilensis 査読

Chongyang Wu, Ryota Tanaka, Kyohei Fujiyoshi, Yasuaki Akaji, Muneto Hirobe, Naoko Miki, Juan Li, Keiji Sakamoto, Jian Gao

Plants 13 ( 5 ) 719 - 719 2024年3月

掲載種別：研究論文（学術雑誌）出版者・発行元：MDPI AG

Phenological gaps exert a significant influence on the growth of dwarf bamboos. However, how dwarf bamboos respond to and exploit these phenological gaps remain enigmatic. The light environment, soil nutrients, leaf morphology, maximum photosynthetic rate, foliage dynamics, and branching characteristics of Sasa kurilensis were examined under the canopies of Fagus crenata and Magnolia obovata. The goal was to elucidate the adaptive responses of S. kurilensis to phenological gaps in the forest understory. The findings suggest that phenological gaps under an M. obovata canopy augment the available biomass of S. kurilensis, enhancing leaf area, leaf thickness, and carbon content per unit area. However, these gaps do not appreciably influence the maximum photosynthetic rate, total leaf number, leaf lifespan, branch number, and average branch length. These findings underscore the significant impact of annually recurring phenological gaps on various aspects of S. kurilensis growth, such as its aboveground biomass, leaf morphology, and leaf biochemical characteristics. It appears that leaf morphology is a pivotal trait in the response of S. kurilensis to phenological gaps. Given the potential ubiquity of the influence of phenological gaps on dwarf bamboos across most deciduous broadleaf forests, this canopy phenomenon should not be overlooked.

DOI： 10.3390/plants13050719

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Characterization of polymorphic microsatellite markers for a coniferous shrub Juniperus sabina (Cupressaceae) 査読

Qifang Geng, Hua Qing, Ziran Ling, Nasreen Jeelani, Jie Yang, Ken Yoshikawa, Naoko H. Miki, Zhongsheng Wang, Chunlan Lian

PLANT SPECIES BIOLOGY 32 ( 3 ) 252 - 255 2017年7月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：WILEY

Juniperus sabinaL. is an evergreen coniferous shrub, with a widespread distribution in Asia and Europe. It is one of the key species for restoration of the ecosystem in desertification areas. In the present study, we isolated and characterized eight microsatellite loci of this species. The number of alleles per locus ranged from two to 27, with observed heterozygosity values ranging from 0.256 to 0.744 and expected heterozygosity from 0.276 to 0.939. The markers developed in this study could be useful for population genetics studies of J. sabina.

DOI： 10.1111/1442-1984.12152

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Freezing xylem conduits with liquid nitrogen creates artifactual embolisms in water-stressed broadleaf trees 査読

Toshihiro Umebayashi, Mayumi Y. Ogasa, Naoko H. Miki, Yasuhiro Utsumi, Tomoyuki Haishi, Kenji Fukuda

Trees - Structure and Function 30 ( 1 ) 305 - 316 2016年2月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2015, Springer-Verlag Berlin Heidelberg. Key message: Freezing with liquid nitrogen promotes the expansion of air in water columns of water-stressed, intact trees that are not transpiring. Abstract: In analyses of the distribution of water-filled and embolized conduits, xylem sap is frozen with liquid nitrogen and visualized using cryo-scanning electron microscopy (cryo-SEM). However, artifacts may be introduced during preparation of samples for these analyses. If the xylem is frozen intact, conduits may embolize during freezing when xylem water potential (Ψxylem) is substantially negative, whereas rehydration to release negative pressure may induce artifactual refilling. To evaluate these sampling phenomena during dehydration and rehydration, we monitored dynamic changes in xylem functional status in the stem of Dendropanax trifidus by compact magnetic resonance imaging (CMRI). We also visualized the water distribution in xylem (under low Ψxylem and with no transpiration) after freezing D. trifidus and Carpinus tschonoskii stems with liquid nitrogen. Artifactual refilling of embolized conduits was sometimes observed in D. trifidus samples cut underwater prior to freezing; however, the extent of refilling may have no influence on hydraulic measurements. Living cells in all samples were dramatically restored after rehydration by cutting underwater. In the current-year xylem, intact saplings of C. tschonoskii frozen with liquid nitrogen after dehydration had a greater number of embolized vessels than samples cut underwater. When a low Ψxylem (≤−2.5 MPa) was maintained, artifactual embolisms were rarely observed in samples directly frozen after rehydration. Thus, relaxation of negative Ψxylem and rehydration are important factors for consideration when assessing the distribution of embolized conduits by cryo-SEM.

DOI： 10.1007/s00468-015-1302-4

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中国半乾燥地の固定砂丘上における Artemisia ordosica Krasch. 群落の構造にJuniperus sabina L. と土壌表層の環境条件が与える影響査読

松本哲也, 三木直子, 廣部宗, 張国盛, 王林和, 吉川賢

日本緑化工学会誌 41 ( 1 ) 56 - 61 2015年

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：日本緑化工学会

中国内蒙古自治区の毛烏素沙地において，緑化植物である落葉半灌木 Artemisia ordosica Krasch.の群落構造に，同じ固定砂丘上に分布する匍匐性針葉樹 Juniperus sabina L.と土壌表層の環境条件が与える影響について調査を行った。固定砂丘上の群落に調査区を設置し，株密度，株位置，株サイズ，結実状況を調査し，表層土壌の環境条件を測定した。その結果，両種は排他的な分布をしており，土壌表層の養分量が多く J. sabina と近い場所では群落の株密度と合計樹冠投影面積は小さい傾向があった。したがって，固定砂丘上では土壌表層の養分条件の差異よりも，J. sabina との資源を巡る競合が A. ordosica 群落に影響する可能性が示唆された。

DOI： 10.7211/jjsrt.41.56

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