大麦湿害机理研究

对不同大麦品种各生育阶段分别进行湿害处理,以研究其生理机理的变化。结果表明,大麦受湿害后,蒸腾强度迅速上升,根系活力和地上部含水量均下降;细胞结构破坏,叶片丙二醛含量及电导率升高,叶绿素含量及光合能力降低。节间可溶总糖和叶片脯氨酸含量升高,是植株调节适应的体现.生理代谢的破坏,导致大麦各器官功能下降,生长发育受阻,植株早衰.干物质积累降低。湿害主要影响正在形成和生长最快的器官以及产量因素。大麦生育后期比前期对湿害敏感,早期湿害解除后恢复力较强.孕穗期是大麦湿害的生理敏感期,减产最重.水分胁迫的临界点以灌浆期最低。

PRELIMINARY SIUDY ON THE MECHANISM OF WATER-STRESS INJURY IN BARLEY

Different varieties of barley were exposed to wet-stress conditions at various growth Stages.Soil wet-stres was found to have wide physiological effect on the plants. Transpiration rate,malondialdehyde (MAD) content and conductivity rose rapidely,and root activity,the water content of the above-ground parts and the chlorophyl content and photosynthcsis rate of the leaves declined.The increase in soluble sugars of the internodes and in proline in the leaves showed the adaptability of barley to water-stress.The disturb- ancc of physiological metabolism resulted in a iower functioning of all the organs,dry mat- ter accumulation and grain yield and a shorter function period.Wet-stress mainly affected the forming and fast growing organs and yield components.Booting stage seemed to be the most sensitive stage to wet-stress.The lowest critical point or wet-stress occurred at the grain-filling stage.