| 外源亚精胺对烤烟幼苗干旱胁迫的缓解效应研究 |
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| 引用本文： | 魏晓凯,景延秋,何佶弦,顾会战,雷强,俞世康,张启莉,李俊举.外源亚精胺对烤烟幼苗干旱胁迫的缓解效应研究[J].作物杂志,2022,38(3):143-217. |
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| 作者姓名： | 魏晓凯 景延秋 何佶弦 顾会战 雷强 俞世康 张启莉 李俊举 |
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| 作者单位： | 1河南农业大学烟草学院,450002,河南郑州2四川省烟草公司广元市公司,628017,四川广元3中国烟草总公司四川省公司,610041,四川成都 |
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| 基金项目： | 中国烟草总公司四川省公司项目(2019410102000453);四川省烟草公司广元市公司项目(202051080024063) |
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| 摘 要： | 为揭示外源亚精胺（Spd）对不同干旱胁迫程度烤烟幼苗的缓解效应,以云烟87为供试材料,探究叶面喷施0.40mmol/L Spd对不同干旱胁迫程度下烤烟幼苗生物量、光合特性、根系活力、渗透调节物质含量、膜质过氧化物和抗氧化酶活性的影响。结果表明,干旱胁迫抑制了烤烟幼苗的生长发育,尤以重度干旱抑制效果最为显著。轻度干旱胁迫下喷施外源Spd能够显著提高烤烟幼苗的生物量、净光合速率（Pn）、蒸腾速率（Tr）、气孔导度（Gs）和叶绿素含量,同时增强抗氧化酶（SOD、POD和CAT）活性和根系活力,提高渗透调节物质（可溶性蛋白、脯氨酸）含量,降低胞间CO2浓度（Ci）、丙二醛（MDA）含量和O-2·产生速率,有效缓解轻度干旱胁迫造成的损害,而重度干旱胁迫下,喷施外源Spd对于提高烤烟幼苗生物量和光合能力没有显著效果。综合来看,叶面喷施0.40mmol/L Spd能够有效提高烤烟幼苗的抗旱能力,尤其对轻度干旱的烤烟幼苗作用最为显著。
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| 关 键 词： | 亚精胺 烤烟幼苗 干旱胁迫 缓解 抗氧化酶活性 渗透调节物质 |
| 收稿时间： | 2021-06-18 |
Alleviating Effect of Exogenous Spermidine on Flue-Cured Tobacco Seedlings under Drought Stress |
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| Wei Xiaokai,Jing Yanqiu,He Jixian,Gu Huizhan,Lei Qiang,Yu Shikang,Zhang Qili,Li Junju.Alleviating Effect of Exogenous Spermidine on Flue-Cured Tobacco Seedlings under Drought Stress[J].Crops,2022,38(3):143-217. |
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| Authors: | Wei Xiaokai Jing Yanqiu He Jixian Gu Huizhan Lei Qiang Yu Shikang Zhang Qili Li Junju |
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| Institution: | 1College of Tobacco, Henan Agricultural University, Zhengzhou 450002, Henan, China2Guangyuan Branch of Sichuan Tobacco Company, Guangyuan 628017, Sichuan, China3Sichuan Branch of China National Tobacco Company, Chengdu 610041, Sichuan, China |
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| Abstract: | To reveal the alleviating effect of exogenous spermidine on flue-cured tobacco seedlings under different drought stress levels, Yunyan 87 was used as experimental material to study the effects of foliar spraying of 0.40mmol/L spermidine on growth and development, photosynthetic characteristics, root activity, osmoregulation substance content, membrane lipid peroxide, and antioxidant enzyme activities of flue-cured tobacco seedlings under different drought stress levels. The results showed that drought stress significantly inhibited the growth and development of flue-cured tobacco seedlings. Spraying exogenous spermidine could increase the chlorophyll content and photosynthetic rate of leaves, enhance the activities of antioxidant enzymes (SOD, POD, CAT) and root activity, increase the contents of osmoregulation substances (soluble protein, proline), reduce the content of malondialdehyde (MDA), and the production rate of O-2·. In summary, foliar spraying of 0.40mmol/L spermidine could effectively improve the drought resistance of flue-cured tobacco seedlings, especially on mildly drought flue-cured tobacco seedlings. |
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| Keywords: | Spermidine Flue-cured tobacco seedling Drought stress Alleviate Antioxidant enzyme activity Osmoregulation substance |
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