氨基酸水溶肥对辣椒幼苗抗旱性的影响OA

Drought is an abiotic stress factor that restricts vegetable production,and peppers are sensitive to drought stress.In this study,seedlings of Chaotianjiao No.3 were used as materials to investigate the effects of water-soluble amino acid fertilizer at three dilution levels(1000-fold,750-fold,and 500-fold)on the growth and physiological-biochemical characteristics of pepper seedlings under drought stress.The results showed that drought stress significantly inhibited the growth of pepper seedlings,reduced leaf chlorophyll content and antioxidant capacity,and caused membrane lipid peroxidation damage.Application of amino acid water-soluble fertilizer can effectively alleviated the growth inhibition of pepper seedlings under drought stress,with the 500-fold dilution treatment achieving the optimal effect.Compared with the drought-only treatment,seedlings treated with 500-fold amino acid water-soluble fertilizer showed increases of 34.7％in plant height,47.6％in fresh weight per plant and 9.0％in dry weight per plant,respectively;total chlorophyll content in leaves increased by 50.8％;the contents of osmoregulatory substances including soluble protein,proline and soluble sugar were significantly elevated;glutathione(GSH)content,superoxide dismutase(SOD)activity and peroxidase(POD)activity increased by 88.9％,108.2％and 90.9％,respectively;while malondialdehyde(MDA)content decreased by 46.0％,indicating a greatly reduced degree of membrane lipid peroxidation.Taken together,these results demonstrate that water-soluble amino acid fertilizer can alleviate the growth inhibition of pepper seedlings under drought stress and enhance their drought resistance by increasing the content of osmotic regulatory substances,boosting the activity of the antioxidant system,maintaining leaf photosynthetic pigment content,and reducing the degree of membrane lipid peroxidation.