Salinity stress negatively impacts agricultural yield throughout the world affecting production whether it is for subsistence oreconomic gain. The plant response to salinity consists of numerous processes that must function in coordination to alleviate both cellularhyperosmolarity and ion disequilibrium. In addition, crop plants must be capable of satisfactory biomass production in a salineenvironment (yield stability). Tolerance and yield stability are complex genetic traits that are difficult to establish in crops since saltstress may occur as a catastrophic episode, be imposed continuously or intermittently, or become gradually more severe, and at any stageduring development. However, cell biology and molecular genetics research is providing new insight into the plant response to salinityand is identifying genetic determinants that effect salt tolerance. Recent confirmation that many salt tolerance determinants areubiquitous in plants has led to the use of genetic models, like Arabidopsis thaliana, to further dissect the plant salt stress response. Sincemany of the most fundamental salt tolerance determinants are those that mediate cellular ion homeostasis, this review will focus primarilyon the functional essentiality of ion homeostasis mechanisms in plant salt tolerance. The transport systems that facilitate cellular capacityto utilize Na+ for osmotic adjustment and growth and the role of the Salt-Overly-Sensitive (SOS) signal transduction pathway in theregulation of ion homeostasis and salt tolerance will be particularly emphasized. A perspective will be presented that integrates cellularbased stress signaling and ion homeostasis mechanisms into a functional paradigm for whole plants and defines biotechnology strategiesfor enhancing salt tolerance of crops.
نوع مقاله : لاتین
مرتبط با : پروژه - زراعت دیمکاری - زراعت صنعتی
عنوان مقاله : تنش شوری و تحمل گیاهان
مرجع مقاله : گردآوری سیدمهدی شمس
سال انتشار: 2009
تعداد صفحات : 9 صفحه (143 کیلو بایت )