盐磷耦合胁迫下大豆的生长和钠、磷离子长距离运输

Soybean [Glycine max (L.) Merr.] Growth and Long-distance Transport of Sodium and Phosphorus Ions under Salt and Low Phosphorus Coupled Stresses

以2个耐盐性和磷效率有差异的大豆品种为材料,采用水培方法,探讨盐分与缺磷耦合胁迫对大豆生长和钠、磷离子长距离运输影响的结果表明:(1)盐分和低磷胁迫对大豆生长有交互作用,磷浓度相对较高(2MMOL·L-1)时大豆耐盐性降低;(2)钠由木质部的向顶部运输增加,钠在韧皮部的再分配增多;(3)盐胁迫下磷在木质部的运输能力提高,韧皮部中磷的再分配受影响不大;(4)磷盐互作对大豆生长的影响在品种之间无差异。

In this study, two soybean [Glycine max （L.） Merr.] genotypes contrasting in salt tolerance and phosphorus efficiency were employed to investigate the effects of salt and low phosphorus coupled stresses on soybean growth and long-distance transport of sodium and phosphorus ions in a nutrient solution culture system. The results indicated that： （1） There were significant interactions between low phosphorus and salt stress on soybean growth, high phosphorus decreased soybean salt tolerance; （2） High phosphorus significantly increased Na^＋ transport to the upper parts of the xylem and its redistribution in the phloem; （3） Salt stress increased phosphorus transport to the xylem, but had no effect on phosphorus reallocation into the phloem; （4） No genotypic difference was found for the effects of low phosphorus and salt stress interactions on soybean growth.