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Effects of Exogenous Homogentisic Acid on Anthocyanin Synthesis and Antioxidant System in Rice Seedlings under Salt Stress
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Kexin XU1, 2, Xulei YANG1, 2, Manti LI1, 2, Lekang WU1, 2, Yubo HUANG1, 2, Wenli HE2, 3, Taoli LIU4, Yanning TAN1, 2, 3, 4
Chinese Journal of Tropical Crops | 2026, 47(2) : 459 - 466
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Chinese Journal of Tropical Crops | 2026, 47(2): 459-466
• Plant Cultivation, Physiology & Biochemistry •
Effects of Exogenous Homogentisic Acid on Anthocyanin Synthesis and Antioxidant System in Rice Seedlings under Salt Stress
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Kexin XU1, 2, Xulei YANG1, 2, Manti LI1, 2, Lekang WU1, 2, Yubo HUANG1, 2, Wenli HE2, 3, Taoli LIU4, Yanning TAN1, 2, 3, 4
Affiliations
  • 1.College of Tropical Agriculture and Forestry, Hainan University, Haikou, Hainan 570100, China
  • 2.National Saline-alkali Tolerant Rice Technology Innovation Center, Sanya, Hainan 572000, China
  • 3.Hunan Hybrid Rice Research Center/Key Laboratory of Saline-alkali Rice Biology and Genetics Breeding, Ministry of Agriculture and Rural Affairs, Changsha, Hunan 410125, China
  • 4.Hunan University of Humanities and Technology, Loudi, Hunan 417000, China
Published: 2026-02-25 doi: 10.3969/j.issn.1000-2561.2026.02.016
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The regulatory effects of exogenous homogentisic acid (HGA) on plant growth, anthocyanin synthesis, and the antioxidant system at phenotypic, physiological and gene expression levels using one-leaf seedlings of Wushansimiao (R534) were studied to explore the role of HGA in rice salt stress response. The results showed that under 140 mmol/L NaCl stress and treatment with 0.25 mmol/L HGA significantly improved the salt tolerance of rice seedlings. On the 3rd day after treatment, plant height, root length, fresh weight and dry weight increased by 43.95%, 60.00%, 41.86% and 76.38%, respectively, compared to the control without HGA. After 7 days of treatment and 7 days of rewatering, the survival rate of seedlings increased by 56.69%. RT-qPCR analysis revealed that HGA significantly upregulated the key genes involved in anthocyanin biosynthesis in leaves, including OsPAL3, OsCHS8, OsCHI, OsF3H, OsDFR6, OsANS1 and OsUF3GT. Anthocyanin content increased by 15.18%, 24.58% and 39.56% on the 3rd, 5th and 7th day, respectively. On the 3rd day, the accumulation of reactive oxygen species (H2O2 and ) and malondialdehyde (MDA) content decreased, while the activities of antioxidant enzymes SOD, POD and CAT significantly increased. This study preliminarily clarified that HGA could activate the anthocyanin biosynthesis pathway under salt stress to enhance antioxidant capacity, laying a foundation for further understanding the physiological role of HGA.

Oryza sativa L.  /  salt stress  /  homogentisic acid  /  anthocyanin  /  antioxidant
Kexin XU, Xulei YANG, Manti LI, Lekang WU, Yubo HUANG, Wenli HE, Taoli LIU, Yanning TAN. Effects of Exogenous Homogentisic Acid on Anthocyanin Synthesis and Antioxidant System in Rice Seedlings under Salt Stress[J]. Chinese Journal of Tropical Crops, 2026 , 47 (2) : 459 -466 . DOI: 10.3969/j.issn.1000-2561.2026.02.016
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Year 2026 volume 47 Issue 2
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Article Info
doi: 10.3969/j.issn.1000-2561.2026.02.016
  • Receive Date：2025-10-20
  • Online Date：2026-06-26
  • Published：2026-02-25
Article Data
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History
  • Received：2025-10-20
  • Accepted：2025-11-17
Funding
Affiliations
    1.College of Tropical Agriculture and Forestry, Hainan University, Haikou, Hainan 570100, China
    2.National Saline-alkali Tolerant Rice Technology Innovation Center, Sanya, Hainan 572000, China
    3.Hunan Hybrid Rice Research Center/Key Laboratory of Saline-alkali Rice Biology and Genetics Breeding, Ministry of Agriculture and Rural Affairs, Changsha, Hunan 410125, China
    4.Hunan University of Humanities and Technology, Loudi, Hunan 417000, 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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