Heat stress induced impairment of starch mobilisation regulates pollen viability and grain yield in wheat: Study in Eastern Indo-Gangetic Plains
Heat stress induced impairment of starch mobilisation regulates pollen viability and grain yield in wheat: Study in Eastern Indo-Gangetic Plains
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DOI：
10.1016/j.fcr.2017.03.006
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发表时间：
2017-05-01
影响因子：
5.8
通讯作者：
Arora, A.
中科院分区：
文献类型：
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作者：
Dwivedi, S. K.;Basu, Sahana;Arora, A.
印度恒河平原东部（EIGP）种植的长持续时间水稻品种由于收获晚而导致春小麦延迟播种，导致与高温相关的产量损失。本研究旨在评估高温对春小麦基因型（n = 30）的生理、产量属性和产量的影响，这些基因型在田间连续三个冬季播种，具有不同的播种窗口; 11月（适时）、12月（晚）和1月（很晚）。晚播（LS）和极晚播（VLS）条件下开花期的平均温度分别比适时播（TS）条件下高2.7 ℃和5.2 ℃，这导致与TS条件相比，晚播条件下平均减产18%，极晚播条件下平均减产34%。热胁迫使LS和VLS条件下的平均灌浆持续时间分别缩短8.6和12.6天，使试验粒重分别下降17%和39%。分蘖数（-2）、穗长、膜稳定性指数和穗粒数（-1）的遗传力较高，而产量和千粒重的遗传力较低。在我们的研究中，基因型变异是明显的，在所有性状的热敏性。Halna是所研究的小麦品系之一，在所考虑的基因型中表现出极端的耐热性，具有最低的籽粒产量的热敏感性指数（HSI < 0.5）。NW 1012和Raj 4238在TS条件下表现出较高的产量，但在高温胁迫下（HSI > 1.0）不能维持其产量。此外，高温驱动的叶绿素降解可能会降低光合能力。此外，受损的运输光合产物（淀粉动员）从绿色叶（源）花药组织（库）导致高花粉死亡率，从而降低籽粒产量。结果表明，高温对小麦开花期的光合作用有显著的负面影响，光合作用与淀粉动员、花粉生活力和籽粒产量有直接关系。本研究还介绍了一个作物模型系统，以进一步揭示植物耐热性的分子背景。(C)2017 Elsevier B. V.版权所有。
Delayed sowing of spring wheat due to late harvesting of long duration rice varieties sown in Eastern IndoGangetic Plains (EIGP), results in yield loss associated with high temperatures. Present study intended to evaluate the consequences of high temperature on physiology, yield attributes and yield of spring wheat genotypes (n = 30) sown in the field for three consecutive winter seasons with different sowing windows; November (timely), December (late) and January (very late). The average temperature during anthesis stage of late (LS) and very late sowing (VLS) conditions were 2.7 degrees C and 5.2 degrees C higher than that of the timely sowing (TS) condition, which caused an average yield reduction of 18% under LS and 34% under VLS conditions as compared to the TS condition. Heat stress induced 8.6 days reduction in average grain filling duration under LS and 12.6 days under VLS condition, in turn caused 17 and 39% respective decrease in the test weight. High heritability was observed for tiller no. m(-2), spike length, membrane stability index and grain no. spike(-1) while low heritability for grain yield and thousand grain weight among the genotypes studied. In our study, genotypic variation was obvious in all traits regarding thermal susceptibility. Halna, one of the wheat lines studied, displayed extreme heat tolerance among the considered genotypes with the lowest heat susceptibility index for grain yield (HSI < 0.5). NW1012 and Raj4238 presented high yield under TS conditions but could not sustain their ability when exposed to heat stress (HSI > 1.0). Furthermore, high temperature driven degradation of chlorophyll probably reduced photosynthetic capacity. Moreover, impaired transport of photosynthate (starch mobilization) from green foliage (source) to anther tissues (sink) leaded to high pollen mortality and thereby decreased grain yield. The results suggested that high temperature caused the significant negative influence on wheat genotypes at anthesis stage establishing a direct association of photosynthesis with starch mobilisation, pollen viability and grain yield. The study also introduced a crop model system for further revelation of the molecular background of thermo-tolerance in plants. (C) 2017 Elsevier B.V. All rights reserved.