Abstract: Taking the seedlings of Populus pseudo-simonii Kitag and Populus × euramericana cv. “74/76”as test materials, this paper studied the effects of nitric oxide (NO) donor, sodium nitroprusside (SNP), on their drought-resistance under drought stress. The results indicated that after treated with SNP, the sensitivity of leaf water potential to drought stress, stomatal conductance, and transpiration rate of the two poplar seedlings decreased, while the relative water content and water retention ability of their leaves increased. The contents of soluble sugar and soluble protein in poplar leaves also increased. All of these indicated that SNP could decrease the relative conductance of leaves, increase the drought-resistance of poplars, and alleviate the effects of drought stress. Furthermore, SNP might confer more increased tolerance to P. × euramericana cv.“74/76” than to P. pseudo-simonii, suggesting that this NO donor might be better for drought-sensitive poplar.

Key words: Form, Rapeseed, Toxicity