Abscisic acid and ethylene interact in wheat grains in response to soil drying during grain filling.
Abscisic acid and ethylene interact in wheat grains in response to soil drying during grain filling.
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DOI：
10.1111/j.1469-8137.2006.01753.x
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发表时间：
2006-07
期刊：
影响因子：
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通讯作者：
Jianchang Yang;Jianhua Zhang;Kai Liu;Zhiqing Wang;Lijun Liu
中科院分区：
文献类型：
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作者：
Jianchang Yang;Jianhua Zhang;Kai Liu;Zhiqing Wang;Lijun Liu
灌浆是一个受土壤干燥和植物激素调控的密集运输过程。研究了土壤干燥对小麦籽粒灌浆的影响，探讨了脱落酸（ABA）与乙烯的相互作用是如何介导土壤干燥对小麦籽粒灌浆的影响。两个小麦品种，cv。扬麦6号和cv。杨麦11号为大田栽培品种，从花后第9 d至成熟，施用水分充足、中度土干（MD）和重度土干（SD） 3种灌溉处理。优势粒（穗内灌浆早、灌浆大的）ABA浓度高于劣势粒（穗内灌浆晚、灌浆小的），乙烯和1-氨基环丙烷-1-羧酸（ACC）浓度低于劣势粒（穗内灌浆晚、灌浆小的），且优势粒灌浆率较高。MD处理下ABA浓度升高，乙烯和ACC浓度降低，籽粒灌浆速率加快；SD处理下乙烯、ACC和ABA浓度升高，籽粒灌浆速率减慢。化学调节剂的应用也得到了类似的结果。结果在两个品种之间没有差异。小麦籽粒灌浆速率是由籽粒中ABA与乙烯的平衡调节的，ABA与乙烯比例的增加可以提高籽粒灌浆速率。
Grain filling is an intensive transportation process regulated by soil drying and plant hormones. This study investigated how the interaction between abscisic acid (ABA) and ethylene is involved in mediating the effects of soil drying on grain filling in wheat (Triticum aestivum). Two wheat cultivars, cv. Yangmai 6 and cv. Yangmai 11, were field-grown, and three irrigation treatments, well-watered, moderately soil-dried (MD) and severely soil-dried (SD), were imposed from 9 d post anthesis until maturity. A higher ABA concentration and lower concentrations of ethylene and 1-aminocylopropane-1-carboxylic acid (ACC) were found in superior grains (within a spike, those grains that were filled earlier and reached a greater size) than in inferior grains (within a spike, those grains that were filled later and were smaller), and were associated with a higher filling rate in the superior grains. An increase in ABA concentration and reductions in ethylene and ACC concentrations in grains under MD conditions increased the grain-filling rate, whereas much higher ethylene, ACC and ABA concentrations under SD conditions reduced the grain-filling rate. Application of chemical regulators gave similar results. The results did not differ between the two cultivars. The grain-filling rate in wheat is mediated by the balance between ABA and ethylene in the grains, and an increase in the ratio of ABA to ethylene increases the grain-filling rate.