盐胁迫对马蔺生长及K+、Na+吸收与运输的影响

本文主要介绍马蔺在盐胁迫下的生长状况以及K 、Na 含量和分布情况。采用砂培试验对马蔺的耐盐性进行了研究。试验结果表明在NaCl胁迫下,随着胁迫浓度的增加,马蔺生物量、株高、干重、肉质化以及K 含量、K /Na 比值降低,同时根冠比、Na 含量增加;各盐处理区根系含水量和肉质化程度大于茎叶,但与盐浓度的相关性不大。在土壤盐浓度<20.0g/kg时,盐胁迫使马蔺根系K-Na的选择性吸收降低,但却增强了向茎叶中运输K 的能力。马蔺受NaCl胁迫时,生长受抑制与植物组织内Na 含量提高和K /Na 比值的降低有关。

EFFECTS OF SALT STRESS ON GROWTH OF AND ABSORPTION AND TRANSPORTATION OF K+ AND Na+ IN I. LACTEA VAR. CHINENSIS

In this paper, the growth performance and contents of K and Na of I. lactea var. chinensis related to salt stress were studied through cultivation on a sand culture experiment. The result showed that the biomass, plant height, dry weigh, carnification, K content and K /Na ratios of I. lactea var. chinensis decreased with increasing NaCl stress, while root/shoot ratios and Na content increased. The water content and carnification degree of roots in all treatments were higher than shoots, which, however, was not significantly related to salt concentration. When the salt concentration was less than 20 g/kg, for I. lactea var. chinensis, the absorption selectivity of K in roots decreased, but the transportation selectivity to shoots increased. So under NaCl stress, the restrained growth of I. lactea var. chinensis was much related to increased Na content and decreased K /Na ratio.