Effects of Drought on Morphology and Physiology of quinoa During the Flowering Stage
To investigate the effect of drought stress on the morphological characteristics of quinoa during flowering,Longli No.1 and Qingli No.1 were used as experimental materials,using normal ir-rigation as a control,three drought stress intensity treatments were set up.After 15 days of drought stress during the flowering period of quinoa,physiological indicators such as relative water content,leaf specific gravity,catalase(CAT)activity,and malondialdehyde(MDA)content in the leaves of each treated plant were measured.Normal irrigation was restored after 15 days of drought stress,and plant height,main spike length,and effective branch number were measured at maturity.The results showed that the relative water content and leaf specific gravity of plants decreased with the decrease of soil moisture,and different degrees of drought stress had no significant effect on the relative water content of leaves,but had a significant effect on the specific proportion of leaves.Malondialdehyde(MDA)content and catalase(CAT)activity were also positively correlated with drought stress,which increased with the severity of drought stress.After drought stress,plant height,main panicle length and effective branch count decreased,but mild and moderate drought stress had no significant effect on plant height and main spike length,severe drought stress significantly affected plant height and main spike length,and moderate and severe drought stress significantly affected effective branch number.The results indicated that moderate drought stress at flowering stage had little effect on the morphological characteristics of quinoa.
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