张皓炀,褚晶,王宇,涂雅琴,江行玉,谢青

• 1:广东海洋大学滨海农业学院
• 2:海南省耐盐作物生物技术重点实验室/海南大学热带作物学院

摘要(Abstract)：

【目的】提高耐盐水稻抽穗抗倒伏特性和产量。【方法】以矮秆耐盐水稻新种质“海稻21”(SR21)为研究对象，系统比较其与亲本“海稻86”(SR86)的农艺性状差异，同时用0、50、100、150 mmol/L NaCl处理幼苗，比较SR21、SR86、盐敏感IR29的盐响应。【结果】SR21早稻正常成熟而SR86表现不抽穗，SR21晚稻生育期比SR86短23 d，株高降低33.93%，分蘖数减少24.24%，理论产量提升16.39%，主要归因于穗粒数增加49.48%，其中两者的株高、分蘖数、理论产量和穗粒数差异显著（P<0.001）。盐胁迫对3个种质的生长均产生一定的抑制，但对SR21和SR86的生长抑制作用较小。与IR29相比，SR21和SR86均可保持较高的抗氧化酶活性，减轻盐胁迫对细胞造成的氧化损伤。此外，SR21和SR86具备较好的渗透调节物质水平，使其在盐胁迫下保持较强的持绿能力。总体而言，盐胁迫下SR21和SR86的活性氧清除能力类似。【结论】SR21株型在缩短生育期的同时实现了产量提升，其地上部激活抗氧化酶系统维持光合稳态，根系增强超氧化物歧化酶（SOD）及过氧化物酶（POD）活性提升耐盐性。

关键词(KeyWords)： 水稻;矮杆;种质资源;农艺性状;盐胁迫

Abstract:

Keywords:

基金项目(Foundation): 广东省自然科学基金项目“矮杆非光敏海水稻耐盐和非光敏机理及其滨海滩涂栽培技术研究”（2023A1515012295）;; 广东海洋大学科研启动项目（060302052320）

作者(Author): 张皓炀,褚晶,王宇,涂雅琴,江行玉,谢青

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