干旱胁迫和复水对麻竹渗透调节物质及细胞膜透性的影响

以麻竹(Dendrocalamus latiflorus Munro)作为试验材料,在温室条件下研究自然干旱胁迫对麻竹叶片渗透调节物质及细胞膜透性的影响。结果表明:随着干旱胁迫时间的延长,丙二醛含量、相对电导率、可溶性糖含量及脯氨酸含量都呈现出先升高后下降的趋势,最大值并没有出现在土壤含水量最低值9.45%时,而是在土壤含水为11.44%时出现。复水后,脯氨酸含量仍然维持在较高水平。实验结果表明,当土壤含水量达到9.45%时,及时补水麻竹仍能恢复正常。切片观察的结果也表明,除颜色有所变化外,干旱胁迫并未对麻竹叶片细胞的形态结构产生影响。综合各指标变化情况说明麻竹有着较强的抗旱和恢复能力。

Effect of Continuous Drought Stress and Rewatering on Osmo-regulation Substances and Cell Membrane Permeability in Leaves of Dendrocalamus latiflorus

Broadflower dendrocalamus（Dendrocalamus latiflorus Munro）was planted in the greenhouse as an experimental material,and studies were made of effect of drought stress on osmotic adjustment and cell membrane permeability in dendrocalamus.The result showed that the content of its MDA,proline,soluble sugar and relative conductivity increased at first,and then decreased along with the increase of stress time.Moreover,the maximum value was not observed when the soil moisture content was the lowest（9.45%） but the maximaum value appeared when the soil moisture content was 11.44%,and the content of proline was still very high after rewatering.Dendrocalamus could recover when the soil water content reached 9.45% if it was rewatered in time.The microscopic examination of cut sections of leaf proved that drought stress did not affect the structure of leaf cells beside the change of colour.Changes of all parameters indicated that dendrocalamus had a strong ability to resist drought stress and recover after rewatering.