土壤水分对烤烟产量和品质的影响

ttttt目的ttttt为了探明涝害胁迫下烟草对水杨酸(SA)和硝普钠(SNP)的生理响应，揭示SA和SNP对提高烟草耐涝性的生理机制。ttttttttttttt方法ttttt通过人工模拟水涝胁迫，研究SA和SNP单独和复合处理对烟草根冠比、根系活力、叶绿素含量、渗透调节物质及膜脂过氧化系统的影响。ttttttttttttt结果ttttt水涝胁迫下，SA和SNP可提高根冠比和根系活力，减缓叶绿素和类胡萝卜素含量的下降幅度；使叶片积累更多的可溶性糖、可溶性蛋白质和游离脯氨酸，增强细胞的渗透调节能力。SA和SNP还能提高涝害短期胁迫下SOD和POD的活性，延缓长期胁迫下酶活性的下降，降低过氧化氢的含量和氧自由基产生速率，进而降低丙二醛含量和相对电导率，增强烟草对水涝胁迫的适应性。ttttttttttttt结论ttttt生产上可用SA和SNP复合处理来缓解水涝胁迫对烟草的伤害，SA和SNP复合处理的效果最佳。tttt

Study of the root antioxidative system of tomatoes and eggplants under waterlogged conditions

tttttPurposetttttThe physiological response of tobacco to salicylic acid (SA) and sodium nitroprusside (SNP) under waterlogging stress was investigated, and the physiological mechanism of SA and SNP to improve the waterlogging tolerance of tobacco was revealed.tttttttttttttMethodtttttThrough artificial simulation of waterlogging stress, the effect of SA and SNP only and combined treatments on the tobacco root shoot ratio, root activity, chlorophyll content, osmolytes and lipid peroxidation system were studied.tttttttttttttResulttttttUnder waterlogging stress, SA and SNP could improve the root shoot ratio and root vigor and slow down the decrease of chlorophyll and carotenoid contents; it could increase the cumulation of soluble sugar, soluble protein and free proline, and enhance the osmotic adjustment ability. SA and SNP could improve SOD and POD activities under short-term waterlogging stress, delay the decrease of the enzyme activities under long-term stress, reduce the content of hydrogen peroxide and oxygen free radical production rate, and further decrease MDA content and relative conductivity, enhance tobacco to waterlogging stress adaptability.tttttttttttttConclusiontttttThe production is available on the SA and SNP combined treatment to alleviate the waterlogging stress on tobacco harm, SA and SNP combined treatment has the best effect.tttt