High temperature stress and its effect on pollen development and morphological components of harvest index in the C3 model grass Brachypodium distachyon.
High temperature stress and its effect on pollen development and morphological components of harvest index in the C3 model grass Brachypodium distachyon.
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高温胁迫及其对C3模式草二穗短柄草花粉发育和收获指数形态成分的影响
DOI：
10.1093/jxb/ert142
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发表时间：
2013-07
影响因子：
6.9
通讯作者：
Sage TL
中科院分区：
文献类型：
--
作者：
Harsant J;Pavlovic L;Chiu G;Sultmanis S;Sage TL
为了解决在全球气候变化下提高谷类作物产量的关键问题，研究了高温对两个品系(Bd21和Bd21-3)收获指数(HI)和影响收获指数的形态成分的影响。结果表明，温度≥32°C消除了HI。在32℃时，产量下降的主要原因是花粉活力下降、花粉在花药中滞留和花粉萌发，而小孢子在单核期败育，这与绒被层发育异常有关，导致36℃时产量下降。在24℃和28℃时，籽粒主要在分蘖穗中发育，但腋枝上的穗也形成籽粒。随着温度从24℃升高到28℃，分蘖穗粒数减少，而腋枝穗粒数增加。Bd21和Bd21-3小穗内腋枝和小花发育的不同模式导致Bd21-3腋枝在28℃时产量较高。
The effect of high temperatures on harvest index (HI) and morphological components that contribute to HI was investigated in two lines (Bd21 and Bd21-3) of Brachypodium distachyon, a C3 grass recognized as a tractable plant, to address critical issues associated with enhancing cereal crop yields in the presence of global climate change. The results demonstrated that temperatures ≥32 °C eliminated HI. Reductions in yield at 32 °C were due primarily to declines in pollen viability, retention of pollen in anthers, and pollen germination, while abortion of microspores by the uninucleate stage that was correlated with abnormal tapetal development resulted in yield failure at 36 °C. Increasing temperatures from 24 to 32 °C resulted in reductions in tiller numbers but had no impact on axillary branch numbers per tiller. Grain developed at 24 and 28 °C primarily in tiller spikes, although spikes on axillary branches also formed grain. Grain quantity decreased in tiller spikes but increased in axillary branch spikes as temperatures rose from 24 to 28 °C. Differential patterns of axillary branching and floret development within spikelets between Bd21 and Bd21-3 resulted in higher grain yield in axillary branches of Bd21-3 at 28 °C. The response of male reproductive development and tiller branching patterns in B. distachyon to increasing temperatures mirrors that in other cereal crops, providing support for the use of this C3 grass in assessing the molecular control of HI in the presence of global warming.
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影响因子：
4.3
作者：
Jain, Mukesh;Prasad, P. V. Vara;Chourey, Prem S.
通讯作者：
Chourey, Prem S.
影响因子：
3.1
作者：
Oshino, Takeshi;Abiko, Mafumi;Higashitani, Atsushi
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Higashitani, Atsushi
影响因子：
46.9
作者：
Bennetzen, Jeffrey L.;Schmutz, Jeremy;Devos, Katrien M.
通讯作者：
Devos, Katrien M.
影响因子：
--
作者：
DAWSON, IA;WARDLAW, IF
通讯作者：
WARDLAW, IF
影响因子：
2.5
作者：
Matsui, Tsutomu;Omasa, Kenji;Horie, Takeshi
通讯作者：
Horie, Takeshi