摘要
试验选用薄皮甜瓜品种‘玉美人’种子为材料,用50、100、150、200和250μmol/L浓度的褪黑素进行处理,以清水处理种子为对照,分别研究了外源施加褪黑素对盐碱胁迫下薄皮甜瓜种子的发芽率、发芽势和活力指数的影响,同时分析了褪黑素对盐碱胁迫下薄皮甜瓜种子芽苗总鲜重、胚根长胚芽长的影响。结果表明:不同浓度的褪黑素处理后,发芽能力、总鲜重、胚根长与胚芽长随褪黑素浓度的增加呈先升高后降低的趋势,当褪黑素浓度为150μmol/L时,发芽能力最高。综上,适宜浓度的外源褪黑素能促进盐碱胁迫下种子的萌发。
Soil saline-alkali stress significantly impacts the growth and development of plants,restricting the development of agriculture.Thin-skinned muskmelon has high nutritional value,but it requires high demands on soil physical and chemical properties.Enhancing the salt-alkali resistance of thin-skinned muskmelon and expanding its cultivation are currently hot research focuses.While studies show that melatonin regulates plant salt and alkali stress,its role in muskmelon seed germination remains unreported.In this experiment,the seeds of thin-skinned muskmelon‘Yumeiren’were used as materials and treated with melatonin at concentrations of 50,100,150,200,and 250μmol/L.The effects of exogenous melatonin on the germination rate and germination potential were evaluated,with water-treated seeds as the controls.The effects of salt-alkali stress on radicle length,germ length,and total fresh weight of muskmelon seeds,along with the antioxidant enzyme system of seedling radicles,were assessed.The results showed improved germination ability of thin-skinned muskmelon seeds under salt-alkali stress with exogenous melatonin treatment.After treatment with different concentrations of melatonin,there was an initial increase followed by a decrease in germination ability.Melatonin treatment also increased the total fresh weight and promoted the growth of radicle and germ under stress conditions.The highest germination ability was observed at a melatonin concentration of 150μmol/L.The total fresh weight,radicle length,and germ length firstly increased and then decreased with the increase of melatonin concentration,peaking at 150μmol/L.
作者
李岩
郭春兰
刘志泰
孙浩轩
张文杰
刘小花
张冲
LI Yan;GUO Chunlan;LIU Zhitai;SUN Haoxuan;ZHANG Wenjie;LIU Xiaohua;ZHANG Chong(Chengde Academy of Agricultural and Forestry Sciences,Chengde,Hebei 067000,China;School of Life Sciences,Shenyang Normal University,Shenyang,Liaoning 110000,China;Jilin Academy of Agricultural Sciences,Changchun,Jilin 130033,China)
出处
《陕西农业科学》
2025年第2期5-8,共4页
Shaanxi Journal of Agricultural Sciences
关键词
薄皮甜瓜
褪黑素
盐碱胁迫
种子萌发
Thin-skinned melon
Melatonin
Saline-alkali stress
Seed germination
