Abstract
Detection of the presence of NO in roots has highlighted the importance of NO in primary root growth, lateral root (LR) initiation and elongation, adventitious root growth, and root hair development. Experimental evidences support that NO is implicated in the auxin-mediated signaling pathways during LR emergence, growth, and development. During all the stages of LR development, endogenous NO biosynthesis is observed in the LR primordia and NO is shown to affect cell-cycle regulatory genes. Stress conditions such as drought, salinity, heavy metal, and nutrient deprivation induce NO biosynthesis in roots demonstrating involvement of NO as a signaling agent in defense responses. However, information on molecular mechanisms is limited.
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