New target for rice lodging resistance and its effect in a typhoon
New target for rice lodging resistance and its effect in a typhoon
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DOI：
10.1007/s00425-007-0642-8
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发表时间：
2008-02-01
期刊：
影响因子：
4.3
通讯作者：
Hirotsu, Naoki
中科院分区：
文献类型：
--
作者：
Ishimaru, Ken;Togawa, Eiji;Hirotsu, Naoki
我们证明了水稻抗倒伏的新目标。通过对水稻“越光”遗传背景下抗台风倒伏位点（lrt 5）近等基因系（暂定名为S1）的生理功能分析，在2004年9月的台风期间（抽穗后28天），观察到S1的抗倒伏性较高，当时“越光”的大多数其他植物都发生了倒伏。肉眼观察发现，在台风期间，上部茎的弯曲引发倒伏;“越光”的上部茎完全弯曲，而S1的上部茎保持笔直。除了台风期间的强雨和大风外，被压扣的上部植物部件的重量增加了对相邻植物的压力，并在“越光”中造成多米诺骨牌效应。杨氏模量，杆的刚度的指标，是显着高于S1比“越光”。在上部秆中，S1的淀粉含量是“越光”的4.8倍，并且S1的上部叶衰老延迟。这些结果表明，较高的淀粉含量的上部秆的刚性（由于在上部叶片的延迟衰老）可能是负责在台风期间水稻较高的抗倒伏性。
We demonstrated the new target for lodging resistance in rice (Oryza sativa L.) by the analysis of physiological function of a locus for lodging resistance in a typhoon (lrt5) with the near isogenic line under rice "Koshihikari" genetic background (tentatively named S1). The higher lodging resistance of S1 was observed during a typhoon in September 2004 (28 days after heading), when most other plants in "Koshihikari" became lodged. Visual observations showed that bending of the upper stems triggered lodging during the typhoon; the upper stem of "Koshihikari" buckled completely, whereas that of S1 remained straight. In addition to the strong rain and winds during the typhoon, the weight of the buckled upper plant parts increased the pressure on adjacent plants and caused a domino effect in "Koshihikari". Young's modulus, an indicator of the rigidity of the culm, was significantly higher in S1 than in "Koshihikari". In the upper culm, the starch content in S1 was 4.8 times the value in "Koshihikari", and senescence was delayed in the upper leaves of S1. These results suggest that the rigidity of the upper culm by the higher starch content (as a result of delayed senescence in the upper leaves) may be responsible for the higher lodging resistance during a typhoon in rice.