| 外源褪黑素对盐胁迫下香椿种子萌发及幼苗生长的影响 |
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| 引用本文： | 刘珂,张嘉欣,杜清洁,刘珂珂,马勇斌,丁新新,肖怀娟.外源褪黑素对盐胁迫下香椿种子萌发及幼苗生长的影响[J].中国瓜菜,2020(5):53-58. |
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| 作者姓名： | 刘珂 张嘉欣 杜清洁 刘珂珂 马勇斌 丁新新 肖怀娟 |
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| 作者单位： | 河南农业大学园艺学院;郑州普罗现代农业有限公司 |
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| 基金项目： | 河南省大宗蔬菜产业技术体系建设专项资助项目(S2015-03);河南农业大学自然科学类青年创新基金(30500539);河南省高等学校重点科研项目(14A210019)。 |
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| 摘 要： | 为探究褪黑素对盐胁迫环境下香椿(Toona sinensis)种子萌发及幼苗生长的影响,以香椿为试材,采用清水处理为对照,利用NaCl模拟盐胁迫环境,分别用0、50、100、200、300μmol·L^-1的褪黑素处理香椿种子及幼苗,测定种子萌发后的各项生理指标。结果表明,盐胁迫处理显著抑制了香椿种子的发芽率、发芽势、发芽指数和根长,以及幼苗叶片的叶长、叶宽。与盐胁迫处理相比,100μmol·L^-1褪黑素预处理的香椿种子萌发和幼苗生长均得到显著改善,发芽率、发芽势、发芽指数分别显著提高了15.56%、18.89%、12.21%,叶长和叶宽提高了9.26、10.10 mm。盐胁迫导致香椿幼苗丙二醛含量和过氧化物酶活性显著高于对照,而超氧化物歧化酶活性显著低于对照。低浓度褪黑素预处理则显著降低了盐胁迫下丙二醛含量和过氧化物酶活性,提高了超氧化物酶活性。其中,提高香椿幼苗耐盐性的最适褪黑素浓度为100μmol·L^-1,与盐胁迫相比,丙二醛含量和过氧化物酶活性分别降低了6.19μmol·g^-1、6292.57 U·g^-1,超氧化物酶活性提高了22.16 U·g^-1。
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| 关 键 词： | 香椿 褪黑素 盐胁迫 萌发 生长 |
Effects of exogenous melatonin on seed germination and seeding growth of Toona sinensis under salt stress |
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| LIU Ke,ZHANG Jiaxin,DU Qingjie,LIU Keke,MAYongbin,DING Xinxin,XIAO Huaijuan.Effects of exogenous melatonin on seed germination and seeding growth of Toona sinensis under salt stress[J].China Cucurbits And Vegetables,2020(5):53-58. |
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| Authors: | LIU Ke ZHANG Jiaxin DU Qingjie LIU Keke MAYongbin DING Xinxin XIAO Huaijuan |
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| Institution: | (College of Horticulture,Henan Agricultural University,Zhengzhou 450002,Henan,China;Zhengzhou Provence Modern Agriculture Co.,Ltd.,Zhengzhou 450002,Henan,China) |
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| Abstract: | To explore the effect of melatonin on seed germination and seedling growth of Toona sinensis under salt stress.Toona sinensis was used as the test material,NaCl was used to simulate salt environment.Toona sinensis seeds and seedlings were treated with 0,50,100,200 and 300μmol·L^-1 melatonin,respectively,and water treatment was used as control.The root length,germination rate,germination potential,germination index,leaf length,leaf width,chlorophyll content,superoxide dismutase,peroxidase and malondialdehyde were measured.The results showed that the germination rate,germination potential,germination index,root length,the leaf length and the leaf width of seedling leaves were significantly inhibited by salt stress.Compared with salt stress treatment,seed germination and seedling growth of Toona sinensis were significantly improved after 100μmol·L^-1 melatonin pretreatment,germination rate,germination potential,germination index,leaf length,leaf width were significantely improved 15.56%,18.89%,12.21%,9.26 mm and 10.10 mm,respectively.Under salt stress,malondialdehyde content and peroxidase activity in Toona sinensis seedlings were significantly higher than those of control,while superoxide dismutase activity was significantly lower than that of the control.Malondialdehyde content and peroxidase activity under salt stress were significantly reduced by low concentration of melatonin pretreatment,while superoxide activity was increased.The optimum melatonin concentration to improve the salt tolerance of Toona sinensis seedlings was 100μmol·L^-1,compared with salt stress treatment,the decrease of peroxidase activity and malondialdehyde were reduced 6.19μmol·g^-1,6292.57 U·g^-1,respectively,and superoxide dismutase was increased 22.16 U·g^-1. |
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| Keywords: | Toona sinensis Melatonin Salt stress Germination Growth |
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