摘要
以"01998"鸭茅为供试材料,通过设置正常浇水、轻度干旱、中度干旱和重度干旱4种处理,利用光照培养箱模拟干旱胁迫-复水法测定鸭茅的株高、产量、根冠比、叶片相对含水量、脯氨酸含量、根系活力等生理指标,研究了鸭茅响应干旱胁迫-复水的补偿效应影响。结果表明,轻度干旱对鸭茅生长无显著影响。恢复供水后轻度干旱的产量均显著高于对照、中度干旱和重度干旱处理,表现出明显的超补效益,说明轻度干旱-复水响应方式不影响甚至提高其产量水平;在不同程度干旱胁迫下叶片相对含水量、根系活力显著下降,根冠比值持续增加,脯氨酸含量倍增。复水后,叶片相对含水量、脯氨酸含量迅速恢复正常,根系活力在复水9天时显著高于正常供水处理,使鸭茅植株迅速恢复正常的新陈代谢和生长发育。因此,在人工栽培条件下,利用鸭茅轻度干旱-复水响应的方式产生"补偿和超补偿效应"能够实现集约高产栽培。
In order to well document the effects of drought stress and compensatory rewatering on orchardgrass （ Dactylis glomerata L ） and elucidate the the scientific basis for water management, simulated water stress on orchardgrass gowth with different drought degree was performed to study the effects of warter stress and rewatering on plant height, yield, root - shoot ratio, leaf relative water content, proline content, and root activity. The results indicated that light drought did not significantly effect the growth of orchardgrass. On the ninth day after rewatering, the biomass of plants under light drought was significantly higher based on a normal water supply. Under drought stress, relative water content and root activity decreased significantly, root - shoot ratio and proline contents increased. After rewatering of drought stressed plants, t he relative water content and proline contents recovered qluickly to similar with normal water supply, the root activity of drought retressed plants on the ninth day affter rewatering was significantly higher than in those with a normal water supply, which can restored normal metabolism and growth. Therefore light drought and rewatering could not only save water and mitigate drought damage, but also improve the yield and quality of orchardgrass.
出处
《草学》
2017年第4期18-21,共4页
Journal of Grassland and Forage Science
基金
四川省公益性科研院所基本科研(编号:SASA2014A01)
国家自然基金-鸭茅抗旱生理分子机制研究及抗性基因挖掘(编号:31601364)
四川省"十三五"饲草育种公关项目(编号:2016NYZ0039-4)资助
关键词
鸭茅
干旱
复水
补偿效益
Orchardgrass （Dactylis glomerata L. ）
droughts
rewatering
compensatory effect
