河套灌区向日葵耐盐指标评价

被引:27
作者
遆晋松
童文杰
周媛媛
徐长春
王玉浩
文新亚
陈阜
机构
[1] 中国农业大学农学与生物技术学院农业部农作制度重点实验室
关键词
向日葵; 耐盐指标; 生物量; 河套灌区; 耐盐函数;
D O I
暂无
中图分类号
S565.5 [向日葵];
学科分类号
090302 [植物营养学];
摘要
在盐分胁迫下筛选作物不同耐盐指标的适用性,可为耐盐育种和分子标记辅助选择育种提供科学依据。为确定河套灌区向日葵的耐盐指标,本研究以当地主栽品种‘LD 5009’为研究对象,2年共选择14个典型地块作为定位观测点,分析向日葵产量、生物量、株高等12个指标对盐分胁迫的响应,筛选随土壤饱和浸提液电导率(ECe)增加而减小的指标,采用非线性最小二乘数值逼近法建立其随不同土层土壤ECe的S型耐盐方程。结果表明:向日葵产量、生物量、株高、叶面积指数、花盘直径、叶片和茎秆K+含量随土壤盐分的增加而下降。其中,0~20 cm土层ECe与生物量的耐盐函数决定系数最大;盐分胁迫对向日葵叶绿素的合成影响不大;盐分胁迫下,Na+含量逐渐增加,而脯氨酸和SOD含量先增加后减小。因此,盐分胁迫下生物量可作为河套灌区向日葵耐盐性分析的关键指标。
引用
收藏
页码:177 / 184
页数:8
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