当前位置:首页>农业>华中农业大学植物科学技术学院王飞团队在TOP期刊发表科研成果:抽穗后夜间高温通过改变氮代谢影响水稻籽粒蛋白-淀粉平衡及品质研究

华中农业大学植物科学技术学院王飞团队在TOP期刊发表科研成果:抽穗后夜间高温通过改变氮代谢影响水稻籽粒蛋白-淀粉平衡及品质研究

  • 2026-03-07 23:28:34
华中农业大学植物科学技术学院王飞团队在TOP期刊发表科研成果:抽穗后夜间高温通过改变氮代谢影响水稻籽粒蛋白-淀粉平衡及品质研究

Post‐Heading High Nighttime Temperature Impairs Grain Protein‐Starch Balance and Rice Quality Through Altering Nitrogen Metabolism文章发表在《Plant, Cell & Environment》。抽穗后夜间高温(HNT)会引发水稻品种间籽粒贮藏物质响应的基因型差异,籼粳杂交稻甬优4949YY4949)受其影响籽粒蛋白含量和谷蛋白/醇溶蛋白比显著上升,打破蛋白-淀粉平衡,加剧源限制并降低稻米外观与食味品质;而籼稻黄华占(HHZ)响应较弱。蛋白/直链淀粉比与稻米垩白度、糊化特性的相关性强于单一蛋白或直链淀粉含量,氮素从叶片向籽粒的转运调控是水稻应对夜间高温的关键,遗传调控氮素再分配可培育气候韧性优质水稻品种。

研究背景

水稻是全球超半数人口的主食,全球变暖导致的夜间温度升高幅度是白天的3.2倍,灌浆期高温会降低水稻产量、破坏淀粉和蛋白合成,劣化稻米品质。目前关于灌浆期夜间高温下水稻品质下降的主导因素(源/库限制)仍存争议,籽粒蛋白含量对夜间高温响应的基因型差异生理机制研究不足,且现有研究多聚焦日均温或单一品质性状,夜间高温对籽粒贮藏物质及食味品质的调控机制尚不明确,为此开展本研究。

实验方法

20212023年以HHZYY4949为材料开展盆栽试验,灌浆期设置对照(30/22℃,昼/夜)、夜间高温(30/27℃),2023年增设全株高温(33/28℃)。测定产量构成、碾磨与外观品质、食味蒸煮品质及米粉糊化特性;采用元素分析仪等测定蛋白含量与组分,透射电镜观察淀粉粒和蛋白体结构;检测光合呼吸速率、非结构性碳水化合物、氮代谢酶活性、植物激素及游离氨基酸含量;通过转录组测序分析差异表达基因,结合GOKEGG富集分析代谢通路变化,并进行相关统计分析。

核心结果

夜间高温使两个品种产量下降,YY4949减产更显著,且稻米垩白率、垩白度升高,直链淀粉含量降低,YY4949碾磨品质劣变更明显;YY4949籽粒蛋白含量显著上升,谷蛋白/醇溶蛋白比提高,HHZ则无显著变化甚至略有下降,蛋白/直链淀粉比与垩白度呈显著正相关。夜间高温加速YY4949叶绿体降解,上调氮代谢相关酶和转运蛋白表达,促进叶片氮素向籽粒转运,其叶片非结构性碳水化合物消耗更早更快;转录组显示YY4949在氮代谢、碳水化合物代谢通路的基因表达变化更显著,HHZ则侧重维持光合系统相关基因表达。

研究结论

夜间高温下水稻籽粒贮藏物质的响应存在显著基因型差异,YY4949因氮素再分配增强,籽粒蛋白积累增加,打破蛋白-淀粉平衡,加剧源限制,导致垩白增加、品质下降。夜间高温同时影响水稻源能力(光合、呼吸、物质转运)和库强度(激素、淀粉合成酶基因表达),氮素从叶片向籽粒的加速转运是引发籽粒蛋白-淀粉失衡的核心机制。该研究揭示了夜间高温影响水稻品质的生理分子机制,为通过遗传改良调控氮素再分配、培育耐高温优质水稻品种提供了理论依据。

原文链接:

https://doi.org/10.1111/pce.70437

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  1. CONNECT:[ UseTime:0.000697s ] mysql:host=127.0.0.1;port=3306;dbname=h_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000876s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000295s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000269s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000503s ]
  6. SELECT * FROM `set` [ RunTime:0.000186s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000574s ]
  8. SELECT * FROM `article` WHERE `id` = 478679 LIMIT 1 [ RunTime:0.002172s ]
  9. UPDATE `article` SET `lasttime` = 1775726173 WHERE `id` = 478679 [ RunTime:0.005996s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000256s ]
  11. SELECT * FROM `article` WHERE `id` < 478679 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000408s ]
  12. SELECT * FROM `article` WHERE `id` > 478679 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001410s ]
  13. SELECT * FROM `article` WHERE `id` < 478679 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000834s ]
  14. SELECT * FROM `article` WHERE `id` < 478679 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000926s ]
  15. SELECT * FROM `article` WHERE `id` < 478679 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001761s ]
0.087189s