梯度水分对鱼腥草生长及生理特征的影响

Moisture gradient affects the growth and physiological characteristics of Houttuynia cordata

关键词:  梯度水分  鱼腥草  生理特征  生态栽培模式

Key words:  gradient moisture  Houttuynia cordata  physiological characteristic  ecological cultivation pattern

摘要:

以不同的施水量，模拟自然生境中林下鱼腥草不同水分条件，设置了8个水分梯度，研究梯度水分对鱼腥草生长和生理特征的影响，以建立鱼腥草生态栽培模式。结果表明：水分的减少或增加均显著减少生物量，中度、重度干旱和水淹明显降低株高和叶面积指数。重度干旱显著提高根冠比。除轻度湿润组外，水分的减少或增加，均显著提高MDA含量；与对照组相比，各干旱处理组SOD和CAT活性和MDA含量明显增强；除脯氨酸含量以外，湿润各处理组CAT、POD、SOD活性和MDA含量均明显低于干旱各处理组；水淹时，CAT、POD、SOD活性、MDA和脯氨酸含量均较低。说明中度干旱或中度湿润已对鱼腥草形成逆境胁迫。栽培鱼腥草的水分条件可以控制在轻度干旱和轻度湿润之间。

Abstract:

This study aims to determine effects of moisture gradient on the growth and physiological characteristics of Houttuynia cordata for developing an ecological cultivation pattern. Eight kinds of water treatments were conducted to simulate the dynamic change of soil water moisture in the natural habitat of forest. The results showed that biomass was significantly reduced by decrease or increase of moisture as compared to the control；plant height and LAI were inhibited under the condition of heavy drought，moderate drought and waterlogging；heavy drought significantly elevated the root to shoot ratio；decrease or increase of moisture all increased the content of MDA except light moisture group；compared with the control，the activity of SOD and CAT，as well as content of MDA were significantly increased under the condition of drought；the activity of CAT，POD，SOD and the content of MDA of moisture group were respectively lower than those of drought group except for content of proline. In particular，the activity of CAT，POD and SOD，the content of MDA and proline of waterlogging group were generally lower than those of others. H.cordata had been stressed by the condition of moderate drought or moderate moisture. In summary，light drought and light moist conditions were favorable for the cultivation of H.cordata.