论文部分内容阅读
在大田干旱胁迫下,甘蔗叶片水分状况恶化,自由水含量和相对含水量降低,而束缚水含量提高。耐旱性弱的品种Co6304和Y.T.57—423水分恶化严重,在7—8月和10—11月连续干旱30和50天后,高旱区分别达到中度胁迫或严重胁迫程度,而在同等胁迫条件下耐旱品种G.T.11和NCo310仅为轻度胁迫。研究还表明:干旱胁迫下,脂质过氧化作用加剧,质膜透性增加,耐旱性弱的品种变化尤为明显,因此可以利用膜脂过氧化产物丙二醛含量和质膜透性变化作为甘蔗耐旱的鉴定指标。最后本文还探讨了干旱胁迫下脯氨酸含量变化,认为可以利用其变化的相对值作为种质耐旱鉴定生理参数。
Under drought stress in the field, sugarcane leaf water quality deteriorated, free water content and relative water content decreased, while the bound water content increased. Weakly drought-tolerant cultivars Co6304 and Y. T. 57-423, the water quality was seriously deteriorated. After 30 days and 50 days of continuous drought in July-August and October-November, the drought-resistant variety G was moderately stressed or moderately stressed in the drought-hit areas. T. 11 and NCo310 are only mild stress. The results also showed that under drought stress, lipid peroxidation aggravated, membrane permeability increased, and drought-tolerant cultivars changed more obviously. Therefore, changes in malondialdehyde content and plasma membrane permeability of membrane lipid peroxidation products could be used as Sugarcane drought tolerance identification index. Finally, the paper also discussed the change of proline content under drought stress, and considered that the relative value of its change could be used as the physiological parameter to identify drought tolerance of germplasm.