The Response Mechanism of Crop Nitrogen Absorption and Utilization to Salt and Alkali Stress and Related Regulating Managements:A Review
In order to elucidate the response of crop nitrogen absorption and utilization to salt and alkali stress and the regulation mechanisms,based on domestically and internationally research progress,this article summed the effect of salt and alkali stress on crop growth from the aspects of seed germination,seedling growth,root growth,photosynthesis,osmotic regulation system,redox system,and ion balance;discussed the impact of salt and alkali stress on crop nitrogen absorption and utilization and the undying mechanisms from the aspects of soil nitrogen cycling,root nitrogen absorption,and nitrogen assimilation;summarized the regulatory methods on crop nitrogen uptake and utilization under salt alkali stress such as nitrogen efficient variety selection,soil conditioner application,organic matter application,growth regulator application,and endophytic mycorrhizal colonization,and discussed the undying mechanisms.This article pointed out that soil salinization was one of the key soil barrier factors limiting crop production.Increasing nitrogen fertilizer application was an effective way to alleviate salt stress,but improper nitrogen fertilizer application could lead to a decrease in nitrogen utilization efficiency.Further in-depth research on crop nitrogen response mechanisms and regulatory pathways under salt stress from the soil-crop system could be of great significance for crop nutrient management and stable and high crops yield under soil salinization.
salt and alkali stresscrop growthnitrogen absorption and utilizationphysiological mechanismsregulating technique
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