Effect of high temperature and water stress on pollen germination and spikelet fertility in rice
Effect of high temperature and water stress on pollen germination and spikelet fertility in rice
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DOI：
10.1016/j.envexpbot.2010.08.009
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发表时间：
2011-01-01
影响因子：
5.7
通讯作者：
Heuer, S.
中科院分区：
文献类型：
--
作者：
Rang, Z. W.;Jagadish, S. V. K.;Heuer, S.
在未来的气候条件下，水稻可能会更频繁地受到同时高温和水分胁迫在敏感的发育阶段，如开花。在这项研究中，5个水稻基因型暴露于高温，水分胁迫和高温和水分胁迫的组合开花期间，以量化其响应通过小穗育性。显微镜分析显示，治疗和基因型之间的花药开裂的显着差异，与柱头上萌发的花粉粒的数量有适度的高关联。小穗育性与柱头上萌发花粉数有密切关系。虽然三种胁迫处理均导致小穗不育，但高温胁迫导致的不育性在所有五种基因型中最高。小穗育性的累积线性下降与独立的高温胁迫和结合水分胁迫的持续时间进行了量化。在高温、水分胁迫和复合胁迫下，N22的花药开裂率、花粉萌发率和小穗育性均高于IR64、Apo和Moroberekan，表明N22具有较强的耐多种非生物胁迫能力。(C)2010 Elsevier B.V.保留所有权利。
In future climates, rice could more frequently be subjected to simultaneous high temperature and water stress during sensitive developmental stages such as flowering. In this study, five rice genotypes were exposed to high temperature, water stress and combined high temperature and water stress during flowering to quantify their response through spikelet fertility. Microscopic analyses revealed significant differences in anther dehiscence between treatments and genotypes, with a moderately high association with the number of germinated pollen grains on the stigma. There was a strong relationship between spikelet fertility and the number of germinated pollen on stigmas. Although, all three stress treatments resulted in spikelet sterility, high-temperature stress caused the highest sterility in all five genotypes. A cumulative linear decline in spikelet fertility with increasing duration of independent high-temperature stress and in combination with water stress was quantified. Better anther dehiscence, higher in vivo pollen germination, and higher spikelet fertility were observed in both the N22 accessions compared with IR64, Apo and Moroberekan under high temperature, water stress and combined stress, indicating its ability to tolerate multiple abiotic stresses. (C) 2010 Elsevier B.V. All rights reserved.