全生育期水分胁迫对菘蓝形态特征和生理特性的影响

Morphology and physiological characteristics of Isatis indigotica Fort.under water stress in the whole growth period

考察菘蓝植株全生育期在水分胁迫下的形态特征和生理特性的变化。结果表明,在轻度干旱(LS)、中度干旱(MS)、重度干旱(SS)处理区的株高、根长、根粗均低于正常供水(CK)区,且随水分胁迫的增加而明显降低,但根冠比随着胁迫程度的增大而增大。菘蓝叶片的可溶性糖在正常供水区呈缓慢增大的趋势;而在LS、MS、SS处理区基本呈现先减后增;而可溶性蛋白在正常供水CK区及LS区呈波动状变化,在MS、SS处理区呈减小的趋势;POD活性一直增大,CAT和SOD活性先下降后上升,MDA含量呈波浪形变化,但差异不显著。说明在本试验条件下,水分胁迫能明显抑制菘蓝的生长发育,菘蓝也能通过自身生理生化调节来减少水分胁迫带来的伤害,表现出较强的抗旱性。

In this study,the morphological and physiological characteristics of Isatis in digotica Fort were studied.During the whole growth period under water stress by pot experiment.The results showed that under water stress,the plant height,root length and root thickness of the LS,MS and SS treatment were all lower than the CK of normal water supply,and decreased significantly with the increase of water stress,but the root-crown ratio increased with the increase of stress degree.The soluble sugar in the leaves of Isatis in digotica Fort.increased slowly in the normal water supply area.In the processing of LS,MS an d SS,the decrease was followe d by an increase.However,soluble proteins fluctuated in the CK and LS treatment of normal water supply,and decreased in the MS and SS treatment.POD activity increased continuously,CAT and SOD activity first decreased and then increased,and MDA content showed a wavy change,but the difference was not significant.Under the conditions of this test,Water stress can obviously inhibit the growth and development of isatis,and isatis can also reduce the damage caused by water stress through its own physiological and biochemical regulation,and show strong drought resistance.