Faculty Profiles - MIYAZAKI Yuko

Papers - MIYAZAKI Yuko

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Dynamics of internal carbon resources during masting behavior in trees Reviewed

Yuko Miyazaki

ECOLOGICAL RESEARCH 28 ( 2 ) 143 - 150 2013.3

Language：English Publishing type：Research paper (scientific journal) Publisher：SPRINGER JAPAN KK

Several proximate factors of masting have been provided. Here, I focus on the role of internal factors, especially the relationship between internal carbon resources and modular structures in trees. I summarize various studies of carbon resource allocation for reproduction during masting events in terms of the proximate factors of masting and discuss the modular structure in which trees accumulate and consume carbon resources as well as the timing when internal carbon resources affect masting since trees have complex resource dynamics among organs. The resource budget model, which provides a simple mechanistic explanation of the masting mechanism, is supported by various study lines. This model assumes decreasing levels of stored photosynthate after flowering and fruiting. According to several studies, however, carbon reserves do not decrease after fruiting in species in which the modules autonomously allocate current photosynthate for fruiting. In addition, it is important to elucidate when carbon resources affect masting events because during their long developmental processes, trees pass through various stages until they produce maturing fruits to create successful masting events. To explore the mechanisms of masting in future studies, it would be important to figure out how and when candidate factors (including nutrients other than carbon) may influence the entire reproduction process, for example, using field manipulation experiments.

DOI： 10.1007/s11284-011-0892-6

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Dwarf bamboos (Sasa pubiculmis Makino subsp. pubiculmis) are not monocarpic plants : evidence from flowering pattern and genetic structure(<Feature>Why bamboos show gregarious flowering habits? -with special reference to the evolutional tren Reviewed

Miyazaki Yuko, Ohnishi Naoki, Hino Takafumi, Hiura Tsutom

JAPANESE JOURNAL OF ECOLOGY 60 ( 1 ) 73 - 79 2010

Language：Japanese Publisher：日本生態学会暫定事務局

ササ類は開花・結実の豊凶がきわめて明瞭であり、加えて生涯で一度のみ繁殖する一回繁殖型植物と考えられてきた。一方、ササ類は個体群の遺伝構造の把握が困難であったため、これまで一回繁殖性について検証されることはなかった。しかしササ類の特異的な繁殖特性を解明するにはまず一回繁殖性の検証が不可欠である。そこで、オモエザサ個体群において遺伝構造を調べると共に、4年間の開花パターンの調査を行い、一回繁殖性の検証を行った。その結果、開花稈は全て同一ジェネットに属し、ジェネットの占有面積は3ha以上に及んだ。しかし、同一ジェネット内の稈が全て開花したのではなく、大別すると、全ての稈が開花していない範囲、開花稈と非開花稈が混在している範囲、全ての稈が開花している範囲がそれぞれ、同一ジェネット内に同時に存在した。全ての稈が開花した範囲のうち、開花後に全ての地上部が枯死した範囲もあったが、翌年以降も稈が生残する範囲もあった。開花後に地上部が枯死した範囲の地下茎からは、翌年以降に新しい稈や花序が再生する現象がみられた。開花が起こる範囲は年毎に変化したが、同一ジェネットに属していても4年間でまだ一度も開花していない範囲も存在した。また、ラメット間の生理的統合を調べるため、炭素安定同位体(<sup>13</sup>C)を用いてトレース実験を行った結果、非開花稈から地下茎で繋がった開花稈へ<sup>13</sup>Cが転流していた。これらのことから、研究対象としたオモエザサは一斉に開花はするものの、必ずしも一回繁殖型の生活史を有していないことが分かった。

DOI： 10.18960/seitai.60.1_73

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Resource level as a proximate factor influencing fluctuations in male flower production in Cryptomeria japonica D. Don Reviewed

Yuko Miyazaki, Takeshi Osawa, Yoshiaki Waguchi

JOURNAL OF FOREST RESEARCH 14 ( 6 ) 358 - 364 2009.12

Language：English Publishing type：Research paper (scientific journal) Publisher：SPRINGER JAPAN KK

Airborne pollen of Cryptomeria japonica causes severe pollinosis, and the number of people suffering from pollinosis has increased rapidly during recent decades. Male flower production in C. japonica shows annual variability; thus, predicting male flower production for the following spring could be a countermeasure against pollinosis. We analyzed factors that explain fluctuations in male flower production of C. japonica according to parameters reflecting internal resource dynamics based on field observations. In addition, we carried out experiments to regulate available resource levels using artificial shading to test the effect of internal resource levels on the number of male flowers produced. We found that temperature and precipitation in the previous summer and a relative increase in male flower production in the previous year were negatively related, whereas sunshine duration in the previous summer and diameter at breast height were positively related to the current year increase in male flower production. The number of male flowers was significantly reduced by the shading treatment and was positively correlated with the amount of total non-structural carbohydrates in the root. These results suggest that understanding the parameters controlling internal resource levels could lead to more accurate predictions of male flower production.

DOI： 10.1007/s10310-009-0148-2

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Genets of dwarf bamboo do not die after one flowering event: evidence from genetic structure and flowering pattern Reviewed

Yuko Miyazaki, Naoki Ohnishi, Hino Takafumi, Tsutom Hiura

JOURNAL OF PLANT RESEARCH 122 ( 5 ) 523 - 528 2009.9

Language：English Publishing type：Research paper (scientific journal) Publisher：SPRINGER TOKYO

Dwarf bamboos in the genus Sasa are believed to be long-lived, synchronously flowering, and monocarpic plants. However, the monocarpy of dwarf bamboo has not been confirmed, because whether all ramets within one genet flower at the same time cannot be determined without differentiating the genetic structure among ramets. This study aims to evaluate the reproductive traits of Sasa pubiculmis by verifying the monocarpy and physiological integration between flowering ramets and non-flowering ramets during a 4-year flowering period. One genotypically identified genet, which covered an area of approximately 3 ha, had both flowering and non-flowering patches of ramets during the 4-year flowering period (2004-2007). A fraction of the flowering genet remained non-flowering during the 4 years of observation, and did not die after mass flowering. Flowering ramets were physically connected to non-flowering ramets via rhizomes, and assimilated (13)C was allocated from non-flowering ramets to flowering ramets. Consequently, we clarified that this dwarf bamboo potentially has polycarpic reproductive traits rather than monocarpic, and a genet can keep rhizomes and non-flowering patches alive to sustain the organism after mass flowering.

DOI： 10.1007/s10265-009-0241-9

Development and characterization of polymorphic microsatellite DNA markers for Sasa senanensis (Poaceae: Bambuseae) Reviewed

Yuko Miyazaki, Naoki Ohnishi, Kimiko Hirayama, Junco Nagata

CONSERVATION GENETICS 10 ( 3 ) 585 - 587 2009.6

Language：English Publishing type：Research paper (scientific journal) Publisher：SPRINGER

Sasa senanensis is a dwarf bamboo species distributed on the floors of cool temperate forests in Japan and adjacent regions. We isolated eight polymorphic microsatellite loci from this species. The number of alleles ranged from two to eight and the observed heterozygosity per locus from 0.13 to 0.74. Seven of the eight loci were also polymorphic in Sasa nipponica. Most of these markers were successfully amplified in other dwarf bamboo species. These markers will be useful for investigating clonal structure and population genetics in some dwarf bamboo species.

DOI： 10.1007/s10592-008-9575-4

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Phylogeographical analysis by genotyping chloroplast DNA in Zelkova serrata

Fukatsu Eitaro, Shimada Hiromasa, Takii Tadato, Kabemura Yuji, Ubukata Masatoshi, Takahashi Makoto, Nakada Ryogo, Yano Keisuke, Watanabe Atsushi, Koyama Yasuhiro, Odani Jiro, Saito Maki, Miyazaki Yuko

The Japanese Forest Society Congress 119 40 - 40 2008

Allocation of photo-assimilated C-13 from reproductive and non-reproductive shoots to fruits in Styrax obassia Reviewed

Yuko Miyazaki, Tsutom Hiura, Ryo Funada

PLANT SPECIES BIOLOGY 22 ( 1 ) 53 - 57 2007.4

Allocation of resources to reproduction in Styrax obassia in a masting year Reviewed

Y Miyazaki, T Hiura, E Kato, R Funada

ANNALS OF BOTANY 89 ( 6 ) 767 - 772 2002.6

Language：English Publishing type：Research paper (scientific journal) Publisher：OXFORD UNIV PRESS

An analysis is presented of three possible pathways of reproductive allocation, namely, allocation of resources to reproductive organs from reproductive shoots, from non-reproductive shoots and from the main trunk. These pathways were examined by comparing the amount of storage starch in reproductive shoots, non-reproductive shoots and the main trunk in Styrax obassia, a typical masting tree species, during a year of little flowering (1999) and in a mass-flowering year (2000), In addition, we measured rates of light-saturated photosynthesis in leaves of reproductive and non-reproductive shoots to examine the contribution of photosynthetic production to reproductive costs. In both the main trunk and non-reproductive shoots the pattern of seasonal variation in the amount of starch did not differ between 1999 and 2000. However, in the mass-flowering year, the amount of starch in the reproductive shoots was less than that in non-reproductive shoots during the growing season. Thus, reproductive shoots bore most of the cost of reproduction, although non-reproductive shoots and the main trunk also bore some of the cost. Mass-based rates of light-saturated photosynthesis of the leaves of reproductive shoots were significantly higher than those of non-reproductive shoots during both the flowering and the fruiting period. However, leaves of reproductive shoots had a significantly smaller area, a lower mass per area, and lower concentrations of nitrogen than leaves of non-reproductive shoots, although the number of leaves did not differ between the two types of shoots. Therefore, the amount of photosynthate per shoot was significantly lower in reproductive shoots than in non-reproductive shoots. These results suggest that the cost of reproduction depends predominantly on storage starch in reproductive shoots, although it is still unclear how much photosynthate is allocated to reproductive organs from non-reproductive shoots. (C) 2002 Annals of Botany Company.

DOI： 10.1093/aob/mcf107

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