江苏农业学报2025，Vol.41Issue(2)：251-257,7.DOI:10.3969/j.issn.1000-4440.2025.02.005
外源褪黑素对干旱胁迫下马铃薯幼苗生长和产量的影响
Effects of exogenous melatonin on growth and yield of potato seedlings un-der drought stress
摘要
Abstract
In this study,the potato variety Liaoshu 6 was used as the experimental material.Control and five treat-ments were set up:normal water(CK),20%polyethylene glycol-6000(PEG)drought stress(T1),30 μmol/L melatonin+20%PEG drought stress(T2),60 μmol/L melatonin+20%PEG drought stress(T3),90 μmol/L melatonin+20%PEG drought stress(T4)and 120 μmol/L melatonin+20%PEG drought stress(T5).The response mechanism of potato seedling morphology,photosynthetic characteristics and yield to exogenous melatonin under drought stress was studied by spraying melatonin on leaves.The results showed that the plant height,stem diameter,photosynthetic characteristics and tuber weight per plant of potato seedlings under 20%poly-ethylene glycol-6000 drought stress were significantly re-duced compared with CK.Under drought stress,spraying appropriate concentration of melatonin could effectively im-prove the growth and physiological and biochemical charac-teristics of potato seedlings.Compared with T1 treatment,the plant height and stem diameter of potato seedlings under 60 μmol/L melatonin+20%polyethylene glycol-6000 drought stress were increased by 15%and 29%,the net photosynthetic rate,stomatal conductance and transpiration rate were in-creased by 21%,28%and 16%,the maximum photochemical quantum efficiency,apparent electron transport rate and photo-chemical quenching coefficient were increased by 8%,6%and 14%,the activities of superoxide dismutase,catalase and ascorbate oxidase were increased by 8%,39%and 9%,and the tuber number per plant,average tuber weight and tuber weight per plant were increased by 12.5%,7.1%and 22.8%,respectively.The results of comprehensive analysis indicated that under 20%polyethylene glycol-6000 drought stress,spraying 60 μmol/L melatonin on leaves was beneficial to promote the growth of potato seedlings,enhance photosynthetic capacity and antioxidant capacity,and increase yield.关键词
褪黑素/干旱胁迫/马铃薯/生长/产量Key words
melatonin/drought stress/potato/growth/yield分类
农业科技引用本文复制引用
崔亮,付雪娇,万博,周桦楠,杨宇,贾景丽..外源褪黑素对干旱胁迫下马铃薯幼苗生长和产量的影响[J].江苏农业学报,2025,41(2):251-257,7.基金项目
中国-爱沙尼亚马铃薯联合育种实验室基金项目(2019L-HSYS02) （2019L-HSYS02）
沈阳农业大学引进人才专项(2022Y001) （2022Y001）
