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通过旱池试验研究干旱胁迫下三种不同根型苎麻品种和不同生长期苎麻的生理生化指标变化 ,探讨苎麻抗旱性与这些指标的关系。干旱胁迫使苎麻叶片含水量、自由水 束缚水比值、净光合强度及硝酸还原酶活性下降 ,但抗旱性品种下降较少 ;而K+ 、可溶性糖、脯氨酸、丙二醛浓度及原生质膜相对透性 (RPP)、过氧化物酶和过氧化氢酶 (CAT)活性增大。同不抗旱性品种比较 ,抗旱品种K+ 浓度增幅较大 ,而脯氨酸、丙二醛含量及RPP和CAT活性增幅较小。不同生长期、不同根型苎麻在干旱胁迫下这些指标亦存在差异。干旱下叶片含水量、RPP、丙二醛和脯氨酸含量、CAT活性和净光合强度的变化与抗旱性关系密切 ,可用作评价苎麻种质资源抗旱性的间接指标
The physiological and biochemical indexes of three ramie varieties with different rooting and ramie at different growth stages under drought stress were studied through the drought-pool test to discuss the relationship between drought resistance of ramie and these indexes. Under drought stress, the water content of ramie leaves, the ratio of free water irreducible water, net photosynthetic rate and nitrate reductase activity decreased but the drought resistance cultivars decreased less. However, the concentrations of K +, soluble sugar, proline and malondialdehyde and relative plasma membrane Permeability (RPP), peroxidase and catalase (CAT) activity increased. Compared with the non-drought-tolerant cultivars, the K + concentration of the drought-tolerant cultivars increased greatly, while the contents of proline and malondialdehyde and the activities of RPP and CAT increased slightly. Different growth stages, different root ramie in drought stress these indicators are also different. The changes of leaf water content, RPP, MDA and proline content, CAT activity and net photosynthetic intensity in drought were closely related to drought resistance, which could be used as an indirect index to evaluate the drought resistance of ramie germplasm resources