水分胁迫对红麻生理特性和产量的影响

水分胁迫下,红麻叶片水势降低,游离脯氨酸含量大幅度上升,过氧化物酶活性增强,蒸腾速率减慢,用水效率提高,绿叶面积和净同化率变小,生长受阻。以上变化随水分胁迫程度加重而加剧。复水后红麻各项生理功能恢复很快。反映了红麻是一种耐旱性很强的作物。在红麻旺长后期水分胁迫对营养生长及干茎和生麻产量的影响大于旺长前期。但旺长后期水分胁迫后有促进生殖生长的趋势。因此,根据红麻不同时期对水分胁迫的反应及收获对象不同而采取相应的水分管理技术是十分重要的。

Effects of Water Stress on Physiological Characteristics and Yield in Kenaf

Kenaf subjected to water stress during different periods of luxuriant growth stage showed a great increase in free proline content, peroxidase activity and water use efficiency, while a rapid decrease in leaf water potential, transpiration rate, green leaf area and net assimilation rate, resulting in a slow growth of the plant. The more intensive the water stress, the greater all those above changes, The physiological functions can be recovered soon after water supplied. The results indicate that kenaf is a very drought-enduring crop. The reduction amount in vegetative growth and dry stem yield or raw fiber yield was larger when the water stress was applied during the late luxuriant growth period than that during the early phase. However, the late application of the water stress showed a tendency to promote the reproductive growth. Therefore, it is very important to use appropriate water management according to the effects of water stress and the product required.