Institut de Recherche en Biologie Végétale, Université de Montréal, 4101 Sherbrooke est, Montréal, Quebec, Canada H1X 2B2.
Plant Physiol. 1992 Nov;100(3):1599-602. doi: 10.1104/pp.100.3.1599.
A possible role of abscisic acid (ABA) in the regulation of grain set in water-stressed wheat (Triticum aestivum L.) was investigated using a split root system to dry half the roots while the remainder were kept watered. Water uptake by the wet roots maintained the leaf water potential at the normal level, whereas the ABA produced in the dry roots was transported to the spike. This caused the spikelet ABA level to increase to the same extent as when the entire root system was stressed to permit a drop in the leaf water potential. In spite of this, the former treatment did not induce a reduction in grain set, whereas the latter did. Thus, contrary to previous reports, water stress-induced changes in spikelet ABA level alone do not appear to regulate grain set.
使用分根系统来干燥一半的根系，同时保持另一半根系浇水，研究了脱落酸（ABA）在调节水分胁迫小麦（Triticum aestivum L.）结实中的可能作用。湿根吸收水分使叶片水势保持在正常水平，而在干燥根中产生的 ABA 被运输到穗部。这导致小穗 ABA 水平增加到与整个根系受到胁迫以允许叶片水势下降相同的程度。尽管如此，前者处理并没有导致结实减少，而后者则导致了结实减少。因此，与先前的报告相反，单独的水胁迫诱导的小穗 ABA 水平变化似乎并不调节结实。
