作物学报 ›› 2025, Vol. 51 ›› Issue (5): 1215-1229.doi: 10.3724/SP.J.1006.2025.44129
王佳婕1,5,王正楠1,BATOOL Maria1,王旺年1,4,文静1,任长忠1,3,何峰1,3,武优悠1,徐正华1,王晶1,蒯婕1,汪波1,*,周广生1,2,傅廷栋1,2
WANG Jia-Jie1,5,WANG Zheng-Nan1,BATOOL Maria1,WANG Wang-Nian1,4,WEN Jing1,REN Chang-Zhong1,3,HE Feng1,3,WU You-You1,XU Zheng-Hua1,WANG Jing1,KUAI Jie1,WANG Bo1,*,ZHOU Guang-Sheng1,2,Fu Ting-Dong1,2
摘要:
利用能产生经济效益的作物改良盐碱地是扩充我国后备耕地资源的重要手段。明确油菜和小麦响应盐碱胁迫的生理机制,将为挖掘油菜、小麦在盐碱地种植以用作饲料及改良利用盐碱地中的潜力提供依据。本研究将取自吉林白城的盐碱土与武汉常规土壤配制为盐浓度分别为0.2%、0.4%的盐碱土,以武汉常规土壤作对照(CK)进行盆栽试验,分别以耐盐碱能力不同的甘蓝型油菜和小麦为材料,测定生物量、渗透调节、离子平衡、抗氧化酶及H2O2、O2?等指标。研究结果表明,(1) 盐碱胁迫下,油菜叶柄中的Na+含量最高,达88.40 mg g?1;小麦则是根系中的Na+含量最高,为33.45 mg g?1;且油菜各部位中的Na+积累量均显著高于小麦,尤其是叶片中的Na+积累量,高出2~8倍。(2) 油菜和小麦在盐碱胁迫下,耐盐碱品种各部位中的K+降幅和K+/Na+比值均高于盐敏感品种,Na+增幅均低于盐敏感品种;油菜苗期根系、蕾薹期叶片中的Na+对K+吸收的抑制效应最大,而小麦各个时期均为根系中的Na+对K+吸收的抑制效应最大。(3) 油菜和小麦在盐碱胁迫下,耐盐碱品种植株体内的可溶性糖含量、抗氧化酶活性以及O2?清除能力均高于盐敏感品种,H2O2、O2?均随盐碱胁迫浓度升高而增加,但耐盐碱品种叶片增幅较小;不同的是,耐盐碱油菜品种在苗期抗盐碱生理机制中响应更快,随着生育期的推进,叶片中的可溶性糖含量以及O2?清除能力也会逐渐增加;而耐盐碱小麦品种叶片中的可溶性糖含量和O2?的清除能力均随生育期推进而显著降低。油菜主要通过“储钠”作用将Na+区隔化进叶柄和茎秆中,而小麦主要通过“拒钠”作用减少Na+的吸收,并将Na+更多地积累在根系中;耐盐碱能力强的品种维持钠钾离子平衡能力更强;油菜耐盐碱能力随着生育期的推进逐渐增强,而小麦的耐盐碱能力则随着生育期推进逐渐减弱。
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