Effects of exogenous melatonin on chlorophyll fluorescence and antioxidant system of pepper (Capsicum annuum L.) under low temperature and low light stress

doi:10.3969/j.issn.1004-1524.2022.09.12

Acta Agriculturae Zhejiangensis ›› 2022, Vol. 34 ›› Issue (9): 1935-1944.DOI: 10.3969/j.issn.1004-1524.2022.09.12

• Horticultural Science • Previous Articles Next Articles

Effects of exogenous melatonin on chlorophyll fluorescence and antioxidant system of pepper (Capsicum annuum L.) under low temperature and low light stress

DING Dongxia(), LI Nenghui, LI Jing, TANG Chaonan, WANG Cheng, NIU Tianhang, YANG Yan, YANG Haitao, XIE Jianming()

College of Horticulture, Gansu Agricultural University, Lanzhou 730070, China

Received:2021-03-17 Online:2022-09-25 Published:2022-09-30
Contact: XIE Jianming

Abstract

Abstract:

In this study, pepper variety Longjiao 10 was used as the material. The different concentrations of melatonin including 0 (T1), 50 (T2), 100 (T3), 150 (T4), 200 (T5), 250 (T6) μmol·L^-1 were sprayed at seedling stage, and chlorophyll content, chlorophyll fluorescence parameters, relative conductivity, soluble sugar, malondialdehyde (MDA) content, and antioxidant enzyme activity of pepper seedlings under low temperature and low light stress were determined. The results showed that 7 day after treatment with low temperature and low light stress (15 ℃/5 ℃, 100 μmol·m^-2·s^-1), after exogenous application of 100 μmol·L^-1 melatonin solution (T3), total chlorophyll content and soluble sugar content increased by 25.72% and 52.88% respectively, compared with T1. The actual photochemical efficiency Y(Ⅱ), the photochemical quenching coefficient qP, photochemical quenching qL increased by 43.79%, 36.99% and 33.88%, separately. The superoxide dismutase (SOD), catalase (CAT) activities were increased significantly by 66.31%, 56.65% while the superoxide anion content and relative conductivity decreased by 48.40% and 17.54%, respectively. In summary, the application of melatonin on the leaves of pepper under low temperature and low light stress could improve the chlorophyll content, chlorophyll fluorescence characteristics and antioxidant capacity, and increase the content of soluble sugar to increase the stress resistance of the plants. The best melatonin concentration was 100 μmol·L^-1.

Key words: melatonin, pepper, low temperature and low light, chlorophyll fluorescence parameters, antioxidant enzymes

CLC Number:

S641.3

DING Dongxia, LI Nenghui, LI Jing, TANG Chaonan, WANG Cheng, NIU Tianhang, YANG Yan, YANG Haitao, XIE Jianming. Effects of exogenous melatonin on chlorophyll fluorescence and antioxidant system of pepper (Capsicum annuum L.) under low temperature and low light stress[J]. Acta Agriculturae Zhejiangensis, 2022, 34(9): 1935-1944.

Figures/Tables 6

Fig.1 Effects of different concentrations of melatonin on photosynthetic pigment content in pepper leaves under low temperature and low light stress The bars without the same letters showed the significant difference (P<0.05). The same as below.

Fig.2 Effects of different concentrations of melatonin on Fv/Fm of pepper leaves under low temperature and low light stress

Table 1 Effects of different concentrations of melatonin on chlorophyll fluorescence parameters of pepper under low temperature and low light stress

处理	实际光化学产量 Y(Ⅱ)	非光化学猝灭的量子产量 Y(NPQ)	非光化学猝灭系数 NPQ	非光化学猝灭 qN	光化学猝灭系数 qP	光化学猝灭 qL	PSⅡ最大光化学效率F_v/F_m
T1	0.279±0.007 cd	0.505±0.005 a	0.583±0.001 a	0.851±0.004 a	0.672±0.025 d	0.633±0.015 c	0.634±0.006 d
T2	0.288±0.014 cd	0.486±0.015 ab	0.556±0.034 a	0.795±0.008 bc	0.740±0.022 bc	0.693±0.008 bc	0.683±0.001 bc
T3	0.401±0.012 a	0.381±0.013 c	0.393±0.011 c	0.731±0.016 d	0.921±0.011 a	0.848±0.003 a	0.705±0.002 a
T4	0.352±0.009 b	0.404±0.029 c	0.442±0.005 b	0.766±0.010 cd	0.881±0.009 a	0.808±0.004 a	0.696±0.003 ab
T5	0.313±0.006 c	0.454±0.006 b	0.455±0.013 b	0.814±0.007 ab	0.796±0.018 b	0.732±0.041 b	0.672±0.005 c
T6	0.277±0.014 d	0.474±0.009 ab	0.464±0.004 b	0.837±0.029 ab	0.726±0.062 cd	0.634±0.013 c	0.673±0.009 c

Fig.3 Effects of different concentrations of melatonin on soluble sugar, MDA content and electrical conductivity of pepper under low temperature and low light conditions

Fig.4 Effects of different concentrations of melatonin on SOD, CAT activity and superoxide anion content of pepper under low temperature and low light stress

Fig.5 Contents of superoxide anions in pepper under low temperature and low light stress treated with different melatonin concentrations

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Effects of exogenous melatonin on chlorophyll fluorescence and antioxidant system of pepper (Capsicum annuum L.) under low temperature and low light stress

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