调环酸钙对盐碱胁迫下绿豆苗期生长的调控作用

以绿丰2号和绿丰5号为试验材料，于第1片复叶展开期进行150mmol/L的混合盐碱胁迫及叶面喷施不同浓度的调环酸钙（Pro-Ca），再继续培养15d后取样，研究不同浓度的Pro-Ca对绿豆苗期生长的调控作用。结果表明，叶面喷施适宜浓度的Pro-Ca（100mg/L）可通过增加渗透物质含量、提升抗氧化酶活性及降低MDA含量来维持细胞渗透势，消除活性氧，降低膜质过氧化程度，保护细胞膜结构，从而缓解盐碱胁迫对绿豆幼苗植株造成的伤害，提高绿豆幼苗抗盐碱的能力，具体表现为100mg/L Pro-Ca处理下绿丰2号和绿丰5号株高分别降低29.64%和21.72%，地下干重分别增加33.33%和50.00%，根冠比分别增加42.86%和8.33%，叶绿素含量分别增加15.77%和18.55%。

Regulating Effects of Prohexadione-Calcium on the Growth of Mung Bean Seedlings under Saline-Alkali Stress

Lüfeng 2 and Lüfeng 5 were used as the experiment materials. 150mmol/L mixed saline-alkali stress was applied and different concentrations of prohexadione-calcium (Pro-Ca) were foliar sprayed during the first compound leaf development period. Samples were collected after 15 days of continued growth to study the regulation effects of different concentrations of Pro-Ca on the growth of mung bean seedlings. The results showed that the suitable concentration of Pro-Ca (100mg/L) could maintain cell osmotic potential, eliminate reactive oxygen species, reduce the degree of membrane peroxidation, and protect cell membrane structure by increasing the content of osmotic substances, enhancing the activity of antioxidant enzymes, and reducing the content of MDA, thereby alleviating the damage to mung bean seedlings caused by salt-alkali stress, and improving the resistance of mung bean seedlings to salt-alkali. Specifically, the plant height of Lüfeng 2 and Lüfeng 5 decreased by 29.64% and 21.72%, the underground dry weight increased by 33.33% and 50.00%, and the root-to-shoot ratio increased by 42.86% and 8.33%, chlorophyll content increased by 15.77% and 18.55%, respectively, under the treatment of 100mg/L.