深水稻节间伸长生长的机制

The Mechanism of Internodal Elongation of Deepwater Rice

淹水可促进深水稻节间快速伸长生长 ,其主要受内源赤霉素、乙烯、脱落酸等激素信号分子的调控。淹水能促进深水稻植株体内乙烯、赤霉素的生物合成、抑制脱落酸的生物合成 ,外源乙烯、赤霉素会加速深水稻节间伸长 ,而外源脱落酸抑制淹水节间的伸长 ,其中赤霉素是直接作用因子 ,乙烯能降低内源脱落酸水平、增加节间对赤霉素的敏感性 ;还与渗透调节、细胞壁组份如膨胀素等有关 ,淹水及赤霉素都大大增加了膨胀素基因的表达。并就深水稻的进一步研究进行了展望。

Partial submergence promotes rapid internodal growth in deepwater rice ( Oryza sativa L.), and this is regulated by three plant hormones: ethylene, gibberellin and abscisic acid. GA is the immediate hormonal signal for this growth response. Ethylene renders the internode more responsive to GA by lowering the level of endogenous abscisic acid. The rapid internodal elongation is related to osmoregulation, the cell wall composition, such as expansins of deepwater rice internodes. Some suggestions on the further research on deepwater rice are given.