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该文以菘蓝幼苗为试验材料,设置不同硫酸钾用量(K0 0 g·kg-1,K1 0.33 g·kg-1,K2 0.67 g·kg-1)和水分条件(适宜水分和干旱),研究菘蓝生长指标、抗氧化酶活性及渗透调节物质含量变化,明确钾肥和水分对菘蓝幼苗生长发育和生理特性的影响,为缓解菘蓝干旱胁迫提供依据。研究发现:①干旱胁迫下菘蓝生长受抑制,生物量下降;钾肥显著缓解干旱胁迫对菘蓝幼苗的伤害。②与无钾处理相比,干旱胁迫下,K1,K2处理地上部生物量增加89.13%,60.87%,K1处理地下部生物量升高,但K2处理地下部生物量下降。③干旱胁迫下,K1,K2处理较K0处理SOD,CAT,POD活性显著增大;可溶性糖含量分别升高16.67%,5.00%,脯氨酸含量分别升高42.41%,65.62%,但可溶性蛋白含量显著下降。综上可得,干旱抑制菘蓝生长,适量钾肥可以通过影响菘蓝植株抗氧化酶活性和渗透调节物质含量等方式达到缓解干旱胁迫目的。
In order to study the effects of different potassium sulfate dosage (K0 0 g · kg-1, K1 0.33 g · kg-1, K2 0.67 g · kg-1) and water condition (suitable water and drought) The effects of potassium fertilizer and water on the growth and physiological characteristics of Isatis indigotica seedlings were studied to study the changes of growth index, antioxidant enzyme activity and osmotic adjustment substance content of A. castaneola and provide basis for alleviating the drought stress. The results showed that: ① Under drought stress, the growth of A. indicum was inhibited and biomass decreased; Potassium fertilizer significantly alleviated the injury of A. indicum seedlings under drought stress. ② Under drought stress, K1 and K2 increased the shoot biomass by 89.13% and 60.87%, while the K1 treatment increased the biomass of the lower part, while the biomass of the lower part of K2 decreased. ③ Under drought stress, the activities of SOD, CAT and POD in K1 and K2 treatments were significantly increased compared with those in K0 treatments. Soluble sugar content increased by 16.67% and 5.00%, proline content increased by 42.41% and 65.62%, respectively. However, soluble protein Significantly decreased. To sum up, drought can restrain the growth of barley blue, and the proper amount of potash fertilizer can alleviate the drought stress by affecting the antioxidant enzyme activity and osmotic adjustment substance content of the plant.