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Effects of DNA Methylation on Physiological Indexes Related to Drought Hardening in Watermelon with Different Ploidy
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Xiaoqing WANG1, 2, 3, Yu GAO1, 2, 3, Xuefei JIANG1, 3, *, Fei QIAO2, *
Chinese Journal of Tropical Crops | 2025, 46(4) : 968 - 977
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Chinese Journal of Tropical Crops | 2025, 46(4): 968-977
• Plant Cultivation, Physiology & Biochemistry •
Effects of DNA Methylation on Physiological Indexes Related to Drought Hardening in Watermelon with Different Ploidy
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Xiaoqing WANG1, 2, 3, Yu GAO1, 2, 3, Xuefei JIANG1, 3, *, Fei QIAO2, *
Affiliations
  • 1.School of Tropical Agriculture and Forestry, Hainan University / Key Laboratory for Quality Regulation of Tropical Horticultural Crops of Hainan Province, Danzhou, Hainan 571737, China
  • 2.Tropical Crops Genetic Resources Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou, Hainan 571101, China
  • 3.Sanya Institute of Breeding and Multiplication, Hainan University, Sanya, Hainan 572025, China
Published: 2025-04-25 doi: 10.3969/j.issn.1000-2561.2025.04.019
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In order to explore the effect of DNA methylation on drought hardening of different ploidy watermelon, mannitol was used to mimic drought stress in suspension cultured cells of different ploidy watermelon. The cell growth and resistance related physiological indexes were measured after stress, recovery and re-stress treatments. Meanwhile, the DNA methyltransferase inhibitor 5-azacytidine (5-AzaC) was used to explore whether methylation is involved in resistance regulation. The results showed that 5-AzaC could retard the growth, inhibit the extracellular alkalization, increase the content of malondialdehyde, bring down the content proline and the activity of protective enzymes such as SOD in all types of cells. Moreover, it caused the membrane permeability raising in diploid and triploid cells. Above results suggest that 5-AzaC can aggravate the osmotic stress injury and reverse the effects of drought hardening partially. Principal component analysis revealed that malondialdehyde content, proline content, PAL, CAT and APX activity could be used as the main evaluation indexes for evaluation the effect of drought hardening. This study would provide clues for mining the physiological indexes for evaluate the effects of stress hardening and the mechanism of DNA methylation involved in watermelon resistance regulation.

watermelon  /  ploidy  /  DNA methylation  /  drought stress  /  physiological index  /  drought hardening
Xiaoqing WANG, Yu GAO, Xuefei JIANG, Fei QIAO. Effects of DNA Methylation on Physiological Indexes Related to Drought Hardening in Watermelon with Different Ploidy[J]. Chinese Journal of Tropical Crops, 2025 , 46 (4) : 968 -977 . DOI: 10.3969/j.issn.1000-2561.2025.04.019
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Article Info
doi: 10.3969/j.issn.1000-2561.2025.04.019
  • Receive Date：2024-10-02
  • Online Date：2026-06-24
  • Published：2025-04-25
Article Data
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History
  • Received：2024-10-02
  • Accepted：2024-12-16
Funding
Affiliations
    1.School of Tropical Agriculture and Forestry, Hainan University / Key Laboratory for Quality Regulation of Tropical Horticultural Crops of Hainan Province, Danzhou, Hainan 571737, China
    2.Tropical Crops Genetic Resources Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou, Hainan 571101, China
    3.Sanya Institute of Breeding and Multiplication, Hainan University, Sanya, Hainan 572025, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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