Effects of Magnesium on Chlorophyll Fluorescence and  Metabolism of <i>Citrullus lanatus</i>

YOU Chuihuai; LIN Lilin; CHEN Sheng; WU Yufen; ZHAO Yijie; KE Yan; LIN Xinping; SHI Mutian

doi:10.19303/j.issn.1008-0384.2021.11.007

Volume 36 Issue 11

Nov. 2021

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YOU C H, LIN L L, CHEN S, et al. Effects of Magnesium on Chlorophyll Fluorescence and Metabolism of Citrullus lanatus [J]. Fujian Journal of Agricultural Sciences，2021，36（11）：1302−1314 doi: 10.19303/j.issn.1008-0384.2021.11.007

Citation:

YOU C H, LIN L L, CHEN S, et al. Effects of Magnesium on Chlorophyll Fluorescence and Metabolism of Citrullus lanatus [J]. Fujian Journal of Agricultural Sciences，2021，36（11）：1302−1314 doi: 10.19303/j.issn.1008-0384.2021.11.007

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Effects of Magnesium on Chlorophyll Fluorescence and Metabolism of Citrullus lanatus

doi: 10.19303/j.issn.1008-0384.2021.11.007

YOU Chuihuai^{1, 2
,},
LIN Lilin¹,
CHEN Sheng³,
WU Yufen³,
ZHAO Yijie⁴,
KE Yan¹,
LIN Xinping⁵,
SHI Mutian^{1
,
,}

1.
College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou, Fujian 　350002, China
2.
College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, Fujian 　350002, China
3.
Agricultural Bio-resources Research Institute, Fujian Academy of Agricultural Sciences, Fuzhou, Fujizn 　350003, China
4.
Fuzhou Institute of Agricultural Sciences, Fuzhou, Fujian, 　350019, China
5.
Zhangzhou City University, Zhangzhou, Fujian 　363000, China

Received Date: 2021-07-19
Rev Recd Date: 2021-08-12

Available Online: 2021-12-30

Publish Date: 2021-11-28

Abstract

Abstract

Objective Effects of magnesium on the growth, development, and metabolism of Citrullus lanatus were studied to determine the appropriate nutrient supply for the melon cultivation. Method At the concentrations of 0, 24, 48, 96, and 192 mg·L⁻¹ on magnesium in sand culture, the growth characteristics (i.e., leaf and root morphology, chlorophyll fluorescence, and biomass accumulation), fruit quality (i.e., vitamin C, soluble solids, soluble protein, and soluble sugar), and physiological responses (i.e., osmoregulation, membrane damage, and antioxidases) of various C. lanatus varieties were compared. Result In the range of 24-96 mg·L⁻¹, the application of magnesium reduced the vulnerability of leaf membrane to damages, increased the contents of antioxidant glutathione (GSH) and ascorbic acid (AsA) as well as the activities of photosystemⅡ (PSII), peroxidase (POD), superoxide dismutase (SOD), catalase (CAT), and monodehydroascorbate reductase (DHAR), while decreased the contents of malondialdehyde (MDA) and proline (Pro), and reduced the cell membrane permeability of the leaves. The addition also promoted the AsA-GSH cycle, photosynthesis, and the biomass accumulations on vitamin C, soluble solids, soluble protein, and soluble sugar. Among the treatments, the 48 mg·L⁻¹ magnesium addition in the culture substrate rendered the most significant improvements on the growth and development of C. lanatus. Whereas, either a deficiency (at 0 mg·L⁻¹) or an excess (e.g., at 192 mg·L⁻¹) on the nutrient ill-affected the membrane lipid peroxidation and shortened the plant roots. Furthermore, the chlorophyll fluorescence declined as indicated by the lower oxygen evolution complex (OEC), quantum yield for electron transport (φ_Eo), and receptor library capacity (Sm), the density of reaction centers (RC/CSo) decreased, the light energy absorption per unit reaction center (ABS/RC) lowered, and the dissipative (DI0/RC), capture (TR0/RC), and Q_A reduction rate (Mo) increased. Thus, either deprivation or over-supply of magnesium could significantly disrupt the normal photosynthetic function inhibiting the growth of C. lanatus. Conclusion Particularly in deficiency, but also in excess, magnesium in soil could diminish the PSII activity and retard the growth of C. lanatus. Appropriate application of the nutrient, such as at 48 mg·L⁻¹ concentration in soil, could effectively improve the physiological activity, stabilize the structure and function of PSII, strengthen the leaf photosynthesis to result in healthy growth and high quality fruit production of C. lanatus.
- Citrullus lanatus,
- magnesium,
- physiological and biochemical characteristics,
- response mechanism,
- chlorophyll fluorescence

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References(45)

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