Effects of Exogenous Nitric Oxide on Tomato Seedlings Root Architecture and Ultrastructure under Copper Stress
Through nutrient solution cultivating in greenhouse, the tomato cultivar, 'Gailiang Maofen 802F1', was selected as the plant material and sodium nitroprusside (SNP) was used as NO donor to investigate the effects of NO on root architecture and ultrastructure changes in tomato seedlings under copper stress. The results showed, under 50 umol·L-1 copper stress, and addition of 100 umol·L-1 SNP could significantly increase tomato seedlings biomass, plant height, stem diameter, root activity. Meanwhile exogenous NO could improve the root architecture (including root length, root diameter, root surface area and root volume) under copper stress, and alleviated the cells destroy in subcellular level (including cell nuclear, mitochondria, chloroplast, vacuoles, nuclear membrane), which maintained tomato seedling tissue structure stable, released plant growth inhibition induced by copper stress. NO scavenger Hb could significantly eliminate alleviating effects.
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