干旱胁迫下罗浮槭苗期的生理和形态变化

以罗浮槭1年生幼苗为材料,测定其在不同干旱处理下的生理和形态变化,以及利用扫描电镜观察不同处理下的叶片生理指标和气孔变化,结果表明:随着处理时间的延长,株高降低;幼苗的MDA含量、可溶性蛋白含量、SOD活性和POD活性均高于对照,前三者均在干旱处理10 d时达到最高值,POD活性在干旱处理20 d时最高,而Pro含量低于对照。MDA含量和POD活性呈先增加后减少的趋势,处理组的Pro含量和可溶性蛋白含量变化不大。此外,在干旱处理下罗浮槭的叶片蜡质增多,总气孔密度减少,气孔器的长、宽和开张度变化不明显。

Physiological and Morphological Changes of Acer fabri Seedlings under Drought Stress

Using one-year-old seedlings of Acer fabri as the tested materials,the physiological and morphological changes in different drought treatments were tested,and the changes in the physiological indexes and stomata of leaves were investigated by SEM.The results showed that the plant height decreased with the increase of treatment time.The content of melondialdehyde(MDA) and soluble protein,and the activity of superoxide dismutase(SOD) and peroxidase(POD) in seedlings in drought treatments were higher than those in the check,the three former reached the highest on the 10th day after drought stress,and the latter was the highest on the 20th day after drought stress.But the content of proline(Pro) in drought treatments was lower than that in the check.Under drought stress,the content of MDA and activity of POD firstly increased and then decreased,the content of Pro and soluble protein changed little,the leaf waxiness increased,total stomatic density decreased,while the length,width and open degree of stomata had no obvious changes.