褪黑素种子引发处理对干旱胁迫下朝天椒生长与生理特性的影响

doi:10.3969/j.issn.1004-1524.20221227

浙江农业学报 ›› 2023, Vol. 35 ›› Issue (10): 2378-2388.DOI: 10.3969/j.issn.1004-1524.20221227

褪黑素种子引发处理对干旱胁迫下朝天椒生长与生理特性的影响

魏茜雅(), 梁腊梅, 林欣琪, 秦中维, 李映志()

广东海洋大学滨海农学院,广东湛江 524000

收稿日期:2022-08-21 出版日期:2023-10-25 发布日期:2023-10-31
作者简介:魏茜雅(1997—),女,新疆伊犁人,硕士研究生,研究方向为热带园艺作物栽培生理。E-mail:1534536534@qq.com
通讯作者: ^*李映志,E-mail: liyz@gdou.edu.cn
基金资助:
广东海洋大学创新强校项目(GDOU2013050217);广东海洋大学创新强校项目(GDOU2016050256)

Effects of melatonin seed priming on growth and physiological characteristics of Capsicum annuum under drought stress

WEI Xiya(), LIANG Lamei, LIN Xinqi, QIN Zhongwei, LI Yingzhi()

Binhai Agricultural College of Guangdong Ocean University, Zhanjiang 524000, Guangdong, China

Received:2022-08-21 Online:2023-10-25 Published:2023-10-31

摘要/Abstract

摘要：

为探究褪黑素种子引发处理对辣椒耐旱性的调控作用,以茂蔬360为材料,通过盆栽PEG模拟干旱胁迫,分析10种不同浓度褪黑素种子引发处理对朝天椒植株生长及生理特性的影响。结果表明:随着引发液浓度的增加,朝天椒的根长、株高、根冠比、根鲜重、地上部鲜重、地上部干重和根干重呈先上升后下降趋势,浓度为100 μmol·L^-1 时,株高、地上部鲜重和地上部干重达到最大值;褪黑素浓度为75 μmol·L^-1 时,根长、根冠比、根鲜重和根干重达到最大值。生理分析表明,100 μmol·L^-1褪黑素引发后,干旱胁迫下的植株叶片丙二醛、过氧化氢和超氧阴离子含量最低,可溶性糖、脯氨酸、抗坏血酸(AsA)、脱氢抗坏血酸(DHA)含量和过氧化物酶(POD)、超氧化物歧化酶(SOD)、抗坏血酸过氧化物酶(APX)、谷胱甘肽还原酶(GR)活性以及根系可溶性蛋白含量最高;75 μmol·L^-1褪黑素引发后,根系丙二醛、过氧化氢、超氧阴离子含量最低,根系可溶性糖、可溶性蛋白、脯氨酸含量,抗氧化酶(POD、SOD、CAT、APX和GR)活性,AsA、DHA含量和AsA/DHA最高,叶片可溶性蛋白含量、CAT活性和AsA/DHA最高。综上,100 μmol·L^-1和75 μmol·L^-1褪黑素引发种子可有效提高朝天椒的耐旱性。

关键词: 干旱胁迫, 朝天椒, 褪黑素, 叶片, 根系

Abstract:

In order to explore the regulatory effect of melatonin seed priming treatment on drought tolerance of pepper, the effects of 10 different concentrations of melatonin seed priming treatment on plant growth and physiological characteristics of pepper were analyzed by pot PEG simulating drought stress with Maoshu 360 as the material. The results showed that the root length, plant height, root-shoot ratio, root fresh weight, shoot fresh weight, shoot dry weight and root dry weight increased firstly and then decreased with the increase of starter solution concentration, and the plant height, shoot fresh weight and shoot dry weight reached the maximum when the concentration was 100 μmol·L^-1. The root length, root shoot ratio, root fresh weight and root dry weight reached the maximum when the concentration was 75 μmol·L^-1. Physiological analysis showed that the contents of malondialdehyde, hydrogen peroxide and superoxide anion were the lowest, while the contents of soluble sugar, soluble protein, proline, AsA, DHA and antioxidant enzyme activities (POD, SOD, APX and GR) were the highest in leaves under drought stress induced by 100 μmol·L^-1 melatonin. After 75 μmol·L^-1 melatonin, the contents of malondialdehyde, hydrogen peroxide, and superoxide anion were the lowest, and the soluble sugar, soluble protein, proline contents, antioxidant enzymes (POD, SOD, CAT, APX and GR) activities, AsA, DHA contents and AsA/DHA in roots were the highest. The activity of CAT and contents of soluble protein and AsA/DHA in leaves were the highest. These results indicated that 100 μmol·L^-1 and 75 μmol·L^-1 melatonin seed priming treatment was beneficial to improve drought resistance of pepper.

Key words: drought stress, pepper, melatonin, leaf, root

中图分类号:

S641.3

魏茜雅, 梁腊梅, 林欣琪, 秦中维, 李映志. 褪黑素种子引发处理对干旱胁迫下朝天椒生长与生理特性的影响[J]. 浙江农业学报, 2023, 35(10): 2378-2388.

WEI Xiya, LIANG Lamei, LIN Xinqi, QIN Zhongwei, LI Yingzhi. Effects of melatonin seed priming on growth and physiological characteristics of Capsicum annuum under drought stress[J]. Acta Agriculturae Zhejiangensis, 2023, 35(10): 2378-2388.

图/表 7

表1 不同浓度褪黑素种子引发处理对干旱胁迫下朝天椒株高、根长和根冠比的影响

Table 1 Effects of seed priming treatments with different concentrations of melatonin on plant height, root length and root-shoot ratio of pepper under drought stress

处理Treatment	株高Plant height/cm	根长Root length/cm	根冠比Root-shoot ratio
CK	11.034±0.061 e	12.687±0.483 g	1.150±0.043 f
T0	11.829±0.158 d	15.679±0.774 f	1.328±0.083 e
T1	12.260±0.192 cd	20.232±0.430 e	1.652±0.058 bcd
T5	12.629±0.302 bc	19.983±0.218 e	1.583±0.024 cd
T25	12.954±0.325 bc	22.902±0.700 cd	1.770±0.072 ab
T50	13.349±0.290 b	23.180±0.875 bc	1.736±0.048 abc
T75	14.486±0.362 a	26.794±0.433 a	1.852±0.055 a
T100	15.042±0.164 a	24.867±0.148 b	1.653±0.009 bcd
T125	12.718±0.346 bc	21.211±0.669 de	1.668±0.012 bcd
T150	10.838±0.101 e	16.381±0.772 f	1.512±0.077 d

表2 不同浓度褪黑素种子引发处理对干旱胁迫下朝天椒根和地上部鲜重和干重的影响

Table 2 Effects of melatonin seed priming treatments with different concentrations on fresh weight and dry weight of root and shoot of pepper under drought stress g

处理 Treatment	根鲜重 Root fresh weight	地上部鲜重 Shoot fresh weight	根干重 Root dry weight	地上部干重 Shoot dry weight
CK	1.359±0.053 e	1.583±0.055 fg	0.072±0.005 f	0.115±0.006 f
T0	1.552±0.04 d	1.766±0.081 e	0.102±0.005 de	0.216±0.007 e
T1	1.596±0.035 d	1.731±0.005 ef	0.114±0.007 d	0.206±0.008 e
T5	1.574±0.048 d	1.720±0.050 ef	0.134±0.005 c	0.241±0.015 e
T25	1.932±0.041 c	2.286±0.056 d	0.145±0.004 c	0.290±0.015 d
T50	2.101±0.052 b	2.31±0.048 cd	0.167±0.003 b	0.323±0.007 cd
T75	2.401±0.035 a	2.455±0.079 bc	0.193±0.007 a	0.471±0.014 b
T100	2.313±0.029 a	2.969±0.015 a	0.185±0.007 a	0.509±0.020 a
T125	1.978±0.060 bc	2.549±0.014 b	0.166±0.003 b	0.462±0.011 b
T150	1.065±0.037 f	1.484±0.080 g	0.097±0.006 e	0.355±0.013 c

图1 不同浓度褪黑素种子引发处理对干旱胁迫下朝天椒叶片和根系MDA(A)、过氧化氢(B)和超氧阴离子(C)含量的影响同一组织不同处理间没有相同小写字母表示差异显著(P<0.05)。下同。

Fig.1 Effects of seed priming treatments with different concentrations of melatonin on MDA (A), hydrogen peroxide (B) and superoxide anion (C) contents in leaves and roots of pepper under drought stress The treatments of the same tissue with different lowercase letters show the significant difference(P<0.05). The same as below.

图2 不同浓度褪黑素种子引发处理对干旱胁迫下朝天椒叶片和根系可溶性蛋白(A)、可溶性糖(B)和脯氨酸(C)含量的影响

Fig.2 Effects of seed priming with different concentrations of melatonin on the contents of soluble protein (A), soluble sugar (B) and proline (C) in leaves and roots of pepper under drought stress

图3 不同浓度褪黑素种子引发对干旱胁迫下朝天椒叶片和根系POD(A)、SOD(B)和CAT(C)活性的影响

Fig.3 Effects of seed priming with different concentrations of melatonin on POD (A), SOD (B) and CAT (C) activities in leaves and roots of pepper under drought stress

图4 不同浓度褪黑素种子引发处理对干旱胁迫下朝天椒根系和叶片APX(A)、GR(B)活性的影响

Fig.4 Effects of seed priming treatments with different concentrations of melatonin on APX (A) and GR (B) activities in roots and leaves of pepper under drought stress

图5 不同浓度褪黑素种子引发处理对干旱胁迫下朝天椒叶片和根系AsA(A)、DHA(B)含量和AsA/DHA(C)的影响

Fig.5 Effects of seed priming treatments with different concentrations of melatonin on contents of AsA (A), DHA (B) and AsA/DHA(C) in leaves and roots of pepper under drought stress

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褪黑素种子引发处理对干旱胁迫下朝天椒生长与生理特性的影响

Effects of melatonin seed priming on growth and physiological characteristics of Capsicum annuum under drought stress

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