矮壮素对马铃薯中薯3号光合特征和磷素营养的影响

被引:34
作者
王惠群 [1 ]
萧浪涛 [2 ]
李合松 [1 ]
吴成春 [1 ]
康朵兰 [1 ]
杨艳丽 [2 ]
机构
[1] 湖南农业大学生物科学技术学院
[2] 湖南农业大学湖南省植物激素与生长发育重点实验室
关键词
矮壮素; 马铃薯; 光合特征; 磷素营养;
D O I
暂无
中图分类号
S532 [马铃薯(土豆)];
学科分类号
摘要
为进一步研究矮壮素调节马铃薯生长发育及其增产的原因,对出苗后24 d和28 d的马铃薯品种"中薯3号"植株分别喷施矮壮素(CCC)0 g/L(A1,对照)、1.5 g/L(A2)2、.0 g/L(A3)、2.5 g/L(A4)各1次,研究CCC对马铃薯中薯3号出苗后不同天数的光合特征和磷素营养的影响。结果表明:A2、A3、A4处理在出苗后36 d(B1)的叶片净光合速率均低于对照,而A2和A3处理的SPAD值高于对照;A3处理在出苗后46 d(B2)、56 d(B3)和66 d(B4)的净光合速率和SPAD值都最高。应用32P示踪技术研究表明,在植株的不同部位[叶(C1)、地上茎(C2)、地下茎(C3)和根(C4)]中,处理组合A3B1C1、A3B1C2、A2B1C3和A3B1C4对32P放射性活度的影响分别与其他相同部位的处理组合有显著差异;在出苗后36 d时,处理A3的根对磷素的吸收量最大,磷素主要运输、分配到地上茎和叶,按各部位相对含量排序,依次为地上茎>叶>根>地下茎。各CCC处理的全株吸磷率随植株的生长而增加,在56 d时全株吸磷率都达到最大值,但在66 d时对磷素的吸收量减少;处理A4、A2和A3在出苗后36 d时的全株吸磷率都高于对照;处理A3的全株吸磷率在出苗后不同天数都高于其他处理。
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页码:1143 / 1147
页数:5
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