模拟气候变暖与干旱复合胁迫对小麦幼苗亚细胞水平Fe、Zn动态积累的影响  

Effects of simulated climate warming and drought combined stress on dynamic accumulation of Fe and Zn at subcellular level in wheat seedlings

作　　者：王小恒[1] 李裕[2] 张芳 WANG Xiaoheng;LI Yu;ZHANG Fang(Medicine Department,Northwest Minzu University,Lanzhou,730030,China;School of Chemical Engineering,Northwest Minzu University,Lanzhou,730030,China)

机构地区：[1]西北民族大学医学部,兰州730030 [2]西北民族大学化工学院,兰州730030

出　　处：《环境化学》2022年第9期3106-3114,共9页Environmental Chemistry

基　　金：甘肃省自然科学基金(20JR5RA502);干旱气象科学研究基金(IAM202105)资助。

摘　　要：为了解气候变化背景下,作物矿质养分利用在亚细胞水平的响应动态及其机理,本研究在人工气候室通过模拟实验,开展了气候变暖与干旱复合胁迫对小麦幼苗亚细胞水平Fe、Zn动态积累影响的探索.研究显示,随着胁迫程度增加,小麦幼苗根、叶部对Fe、Zn元素的富集均呈显著下降趋势,根、叶部Fe最低分别下降至对照的0.56倍和0.58倍,Zn最低分别下降至对照的0.59倍和0.74倍.小麦幼苗根、叶部各亚细胞组分中的Fe、Zn含量随胁迫水平的提高均呈现不同程度下降,各亚细胞分布比例变化不明显. Fe自根向茎叶部迁移呈现先降低后回升的趋势,各处理Fe转移系数分别为对照组的0.66、0.78、1.06倍;Zn自根向茎叶部的迁移呈现先升高后逐渐稳定的趋势,各处理Zn转移系数分别为对照组的1.15、1.24、1.24倍.结果表明,增温与干旱复合胁迫可在不同层面对小麦幼苗Fe、Zn元素的动态富集产生影响,最终可能对农业生产及人类健康产生不利影响.本研究将为农业系统科学应对气候变化提供参考.In order to understand the dynamics response and mechanism of mineral nutrient utilization of crop at the subcellular level under the background of climate change, a simulated experiment was conducted in the artificial climate chamber to evaluate the combined effects of climate warming and drought stress on the bio-accumulation of Fe and Zn at subcellular level in Wheat Seedlings. The results showed with the increase of stress degree, the enrichment of Fe and Zn in roots and leaves of wheat seedlings had a significant downward trend. The lowest content of Fe in roots and leaves decreased to 0.56 and 0.58 times of the control group, Zn decreased to 0.59 and 0.74 times of the control group, respectively. The contents of Fe and Zn in the subcellular components of roots and leaves of wheat seedlings decreased with the increase of stress level. However, the proportion of subcellular distribution showed no significant change. The migration of Fe from root to stem and leaf showed a trend of first decreasing and then rising, the transfer coefficients of Fe in each treatment were 0.66, 0.78 and 1.06 times that of the control group, respectively. The migration of Zn from root to stem and leaf showed a trend of first increasing and then gradually stabilizing, the transfer coefficients of Zn in each treatment were 1.15, 1.24 and 1.24 times that of the control group,respectively. The results showed that the combined stress of warming and drought could affect the dynamic enrichment of Fe and Zn in wheat seedlings at different levels, which would eventually have an adverse impact on agricultural production and human health. This study will provide a reference for the agricultural system to deal with climate change scientifically.

关 键 词：气候变暖 干旱 小麦幼苗 Fe和Zn 

分 类 号：S512.1[农业科学—作物学] S423