中国水稻科学 ›› 2023, Vol. 37 ›› Issue (4): 368-378.DOI: 10.16819/j.1001-7216.2023.221112

• 研究报告 • 上一篇    下一篇

水稻减数分裂期高温对苯丙烷类代谢及下游分支代谢途径的影响

汪胜勇1, 陈宇航1, 陈会丽1, 黄钰杰1, 张啸天1, 丁双成2(), 王宏伟1()   

  1. 1农业农村部长江中游作物绿色高效生产重点实验室(部省共建)/长江大学 农学院,湖北 荆州434025
    2湿地生态与农业利用教育部工程研究中心/长江大学 农学院,湖北 荆州434025
  • 收稿日期:2022-11-24 修回日期:2023-02-07 出版日期:2023-07-10 发布日期:2023-07-17
  • 通讯作者: *email: shchding@yangtzeu.edu.cn;wanghw@yangtzeu.edu.cn
  • 基金资助:
    湿地生态与农业利用教育部工程研究中心开放基金资助项目(KFT202012);主要粮食作物产业化湖北省协同创新中心开放基金资助项目(KFT202108)

Effects of High Temperature on Phenylpropane Metabolism and Downstream Branch Metabolic Pathways in Rice Meiosis

WANG Shengyong1, CHEN Yuhang1, CHEN Huili1, HUANG Yujie1, ZHANG Xiaotian1, DING Shuangcheng2(), WANG Hongwei1()   

  1. 1MARA Key Laboratory of Sustainable Crop Production in the Middle Reaches of the Yangtze River (Co-construction by Ministry and Province)/College of Agriculture, Yangtze University, Jingzhou 434025, China
    2Engineering Research Center of Ecology and Agricultural Use of Wetland, Ministry of Education/ College of Agriculture, Yangtze University, Jingzhou 434025, China
  • Received:2022-11-24 Revised:2023-02-07 Online:2023-07-10 Published:2023-07-17
  • Contact: *email: shchding@yangtzeu.edu.cn;wanghw@yangtzeu.edu.cn

摘要:

【目的】 探究水稻减数分裂期高温如何影响苯丙烷类代谢,并分析其与水稻耐热性的关系。【方法】 以N22、广陆矮15、SDWG005、全两优681、Y两优900、Y两优1号、两优培九和绵恢101(MH101)等8种耐热和不耐热水稻品种为试验材料,设置常温和高温处理,分析减数分裂期高温胁迫对水稻的花粉活力与苯丙烷类代谢关键酶活性、木质素、总黄酮及总酚等主要代谢产物含量之间的相关性;并进一步选择极端耐高温的SDWG005和极端不耐高温的MH101为材料分析苯丙烷类代谢、碳水化合物代谢和抗氧化系统对水稻耐热性的影响。【结果】 1) 与对照相比,高温显著降低水稻花粉活力和颖花受精率,不同的水稻品种受高温影响后,花粉活力和颖花受精率的降幅不同。2) 高温显著增加颖花中肉桂酸-4-羟化酶和4-香豆酸辅酶A连接酶活性以及木质素、总黄酮和总酚的含量,且耐热品种增幅高于敏感品种。3) 高温下花粉活力与肉桂酸-4-羟化酶活性、木质素含量显著相关,颖花受精率与木质素含量以及木质素含量与类黄酮含量极显著相关。4) 与MH101相比,SDWG005小穗颖壳中木质素受高温显著诱导积累,且高温下能够维持较高细胞壁过氧化物酶活性。5) 与MH101相比,SDWG005颖花在高温下能够维持较高过氧化物酶、超氧化物歧化酶和抗坏血酸氧化酶活性,进而减少颖花中过氧化氢和丙二醛的积累。高温下SDWG005颖花中淀粉含量更高,酸性转化酶、蔗糖合酶及ATPase基因的表达量显著增加。【结论】 减数分裂期高温促进颖花中苯丙烷类代谢关键酶活性的上升和代谢产物含量的增加,耐热品种高温下能够积累较多的木质素和类黄酮,具有较高抗氧化酶活性,同时蔗糖代谢和能量产生效率较高,从而具有较强的耐热性。

关键词: 水稻, 高温, 颖花, 苯丙烷类代谢, 木质素, 总黄酮

Abstract:

【Objective】 Our purposes are to investigate how high temperature during rice meiosis affects phenylpropane metabolism and analyze its relationship with heat tolerance of rice. 【Methods】 Eight rice varieties differed in heat tolerance including N22, GLA15 (Guanglu’ai 15), SDWG005, QLY681 (Quanliangyou 681), YLY900 (Y Liangyou 900), YLY1 (Y Liangyou 1), LYP9 (Liangyoupeijiu), and MH101 (Mianhui 101) were used as experimental materials and exposed to room temperature and high temperature for 5 days. The correlations between activities of key enzymes in phenylpropane metabolism and main metabolite contents such as lignin, total flavonoids and total phenols were analyzed as well as the fertility of rice under high temperature stress during the meiotic stage. SDWG005 (heat resistant) and MH101 (heat sensitive) were used as experimental materials to analyze the effects of phenylpropane metabolism, carbohydrate metabolism and antioxidant defense system on heat tolerance of rice. 【Results】 1) Compared with the control, the pollen vitality and fertilization rate of spikelets decreased significantly to various extents at high temperature. 2) HT(high temperature) significantly increased the activities of cinnamate-4-hydroxylase and 4-coumaric acid coenzyme A ligase, as well as the accumulation of lignin, flavonoids and total phenols in spikelets, with resistant varieties registering a higher growth than sensitive ones. 3) Correlation analysis showed that in response to HT pollen activity was significantly correlated with cinnamate-4-hydroxylase activity and lignin content, spikelet fertility was significantly correlated with lignin content, and lignin content was significantly correlated with flavonoid content. 4) Compared with MH101, lignin accumulation in the glumes of SDWG005 was significantly induced under HT. And higher cell wall peroxidase activities were maintained in SDWG005 under HT. 5) Compared with MH101, SDWG005 could maintain higher antioxidant enzyme activities under HT, resulting in less accumulation of H2O2 and malondialdehyde. Under HT, the starch level in SDWG005 flowers was higher, and the expression levels of genes involved in acid invertase, sucrose synthase and ATPase were significantly upregulated. 【Conclusion】 High temperature stress increases the key enzyme activities and metabolite contents in the phenylpropanoid pathway in spikelets during the meiosis stage. The resistant variety accumulates more lignin and flavonoids during HT, has higher antioxidant enzyme activities, higher sucrose metabolism and energy utilization efficiency, thereby improving heat tolerance.

Key words: rice, high temperature, spikelet, phenylpropane metabolism, lignin, flavonoids