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王龙,李静,钱晨,林国冰,李亦扬,杨光,左青松*
WANG Long, LI Jing, QIAN Chen, LIN Guo-Bing, LI Yi-Yang, YANG Guang, and ZUO Qing-Song*
摘要:
为了探明盐胁迫对油菜产量品质和生理特征的影响机制,本研究以浙油50为材料,于2020—2022年油菜生长季在盐城大丰盐碱地进行试验,分别设置低盐和高盐处理,研究油菜碳氮同化、光合特征、抗逆生理以及菜籽产量品质的变化。结果表明,相比低盐处理,高盐处理下油菜初花期各器官干物质积累降低18.46%~35.67%,成熟期降低20.92%~46.03%;高盐处理提高了初花期根和叶片的干物质分配比例,降低了茎枝的分配比例,提高了成熟期根和茎枝的分配比例,降低了果壳和籽粒的分配比例。此外,高盐处理降低初花期和成熟期各器官碳氮积累,降低了茎枝和叶片的碳氮转运效率,表明盐胁迫抑制油菜碳氮同化和花后养分转运,最终导致籽粒产量降低;另一方面,高盐处理下各器官C/N显著降低,表明盐胁迫对碳素同化的抑制程度强于氮素,导致籽粒品质改变,使籽粒蛋白质含量提高8.23%,油分含量降低4.42%。高盐较低盐显著降低初花期叶片净光合速率、气孔导度、蒸腾系数、瞬间羧化效率,提高胞间CO2浓度和水分利用效率,表明盐胁迫对油菜光合的影响可能主要归因于非气孔限制。与低盐相比,高盐下油菜H2O2和MDA含量增加27.41%和42.33%,SOD活性、CAT活性、AsA含量、可溶性蛋白含量和可溶性糖含量分别上升65.54%、22.85%、29.68%、9.75%和16.84%。由此认为,盐胁迫通过抑制油菜碳氮同化和限制光合,降低籽粒产量,改变籽粒品质,同时油菜可以提高抗氧化和渗透调节能力来适应盐胁迫环境。
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