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'研究了水稻开花后剑叶叶片中有关氮代谢相关酶类[硝酸还原酶(NR)、谷氨酰氨合成酶(GS)、谷丙转氨酶(GPT)、谷草转氨酶(GOT)、谷氨酰氨脱氢酶(GDH)、蛋白水解酶(proteinase)]活性及部分酶动力学变化,': [2], '同期测定了可溶性蛋白和游离氨基酸含量变化及穗部农艺性状,': [3], '旨在了解超级杂交稻品种与其常规亲本及对照品种在生育后期与氮代谢相关酶活性及动力学变化的内在规律性,': [4], '为杂交稻生育后期的氮代谢调控提供科学依据。结果表明,': [5], '花后1周为3个品种剑叶叶片中有关氮代谢酶活性的高值持续期,': [6], '接着进入速降期。不同品种间NR、GS、GPT和GDH活性及活性高值期具有显著性差异。花后1周“两优培九”具有较高的GS和GDH活性;': [7], '花后7~14': [8], 'd“汕优63”的NR和GS活性显著高于“9311”和“两优培九”,': [9], '灌浆后期其GS、GDH活性和活性高峰,': [10], '也均高于和迟于其他2个品种;': [11], '“9311”在开花和灌浆初期具有较高的转氨酶活性和催化活性,': [12], '其氮代谢的启动早于其他2个品种。生育后期GDH和GOT的活性变化说明氧化脱氨可能是水稻体内的主要脱氨方式。生育后期NR和GS活性与其催化活性呈非线性关系,': [13], 'GPT在花后14': [14], 'd催化活力表现最低,': [15], '在灌浆后期3种酶仍具有较高的催化活力。叶片可溶性蛋白及ATPase变化说明,': [16], '酶蛋白量是制约水稻生育后期有关氮代谢的酶活性和影响后期氮素代谢的重要因素之一,': [17], '叶片的能量状态是影响生理活性发挥的重要限制因子。从主要酶活性变化、籽粒灌浆速率和穗部性状看,': [18], '生育后期种间杂交种(“汕优63”)比亚种间杂交种(“两优培九”)具有较高的叶生理活性和较强的籽粒灌浆优势。': [19]}, 'cited_by_api_url': 'https://api.openalex.org/works?filter=cites:W2322394462', 'counts_by_year': [{'year': 2022, 'cited_by_count': 1}], 'updated_date': '2024-09-19T14:48:24.259380', 'created_date': '2016-06-24'}