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首页> 美国卫生研究院文献>Plant Physiology >Effects of NaCl on Flows of N and Mineral Ions and on NO3- Reduction Rate within Whole Plants of Salt-Sensitive Bean and Salt-Tolerant Cotton.
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Effects of NaCl on Flows of N and Mineral Ions and on NO3- Reduction Rate within Whole Plants of Salt-Sensitive Bean and Salt-Tolerant Cotton.

机译：氯化钠对盐敏感豆和耐盐棉全株氮离子流及NO3-还原率的影响。

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摘要

The effects of NaCl on the transport rates of cations, NO3-, and reduced N compounds between roots and shoot and on NO3- assimilation rate were examined on plants of two species differing in their sensitivity to salinity, bean (Phaseolus vulgare L. cv Gabriella) and cotton (Gossypium hirsutum L. cv Akala). Biomass production after 20 d in response to 50 and 100 mM NaCl decreased by 48 and 59% in bean, but only 6 and 14% in cotton. The comparison of the flow patterns obtained for control and NaCl-fed plants showed that salinity induced a general decrease in all the fluxes involved in partitioning of N and the various ions. This decrease was markedly higher in bean than in cotton. Within either species, the different flows (uptake, xylem flux, phloem flux) of a given element were affected by NaCl to the same extent with minor exceptions. No specific effect of salinity on any of the components of N partitioning were discerned. The greater sensitivity of nitrate reductase activity to NaCl in bean leaves compared to cotton leaves seems to be due to a decreased compartmentalization of ions rather than to a difference in salt tolerance of the enzyme itself. Overall, our data show that alteration of mineral nutrition is not solely the reflection of a decreased growth rate, but also is a general process that impairs uptake of all the minerals even at mild NaCl salinity.
机译：在两种对盐分敏感性不同的植物上，研究了NaCl对根和茎之间阳离子，NO3-和还原型N化合物在根和茎之间的转运速率以及对NO3-同化率的影响（菜豆） ）和棉花（Gossypium hirsutum L. cv Akala）。 20天后，响应50和100 mM NaCl的生物量在豆类中下降了48％和59％，在棉花中仅下降了6％和14％。对对照植物和NaCl喂养植物获得的流态的比较表明，盐度导致与N和各种离子分配有关的所有通量普遍下降。豆类的下降明显高于棉花。在这两个物种中，除了少数例外，给定元素的不同流量（吸收，木质部通量，韧皮部通量）受到NaCl的影响程度相同。没有发现盐分对N分配的任何组分的具体影响。与棉叶相比，豆叶中硝酸盐还原酶活性对NaCl的敏感性更高，这似乎是由于离子的间隔减少，而不是由于酶本身的耐盐性不同。总体而言，我们的数据表明，矿物质营养的改变不仅反映了生长速度的降低，而且是一个一般过程，即使在适度的NaCl盐度下也会损害所有矿物质的吸收。

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