中国北方杂草稻幼苗对干旱胁迫的生理响应

以杂草稻heb07-2、wr04-6及巴西陆稻IAPAR9为研究材料，采用人工气候箱培养幼苗，利用20%聚乙二醇6000（PEG-6000）模拟干旱条件，研究了杂草稻及巴西陆稻幼苗叶片和根系生理特性标的变化。结果表明：干旱胁迫下,杂草稻heb07-2幼苗的叶片与根系具有较高的超氧化物歧化酶（SOD）、过氧化氢酶（CAT）、抗坏血酸过氧化物酶（APX）活力；杂草稻heb07-2的可溶性糖含量、可溶性蛋白含量高于其它材料。杂草稻heb07-2细胞膜系统保持完整，膜质过氧化程度小于其它材料,表明干旱胁迫对杂草稻heb07-2伤害较小，具有较强苗期抗旱性。

Physiological responses of weedy rice to drought stress at seedling stage

Physiological responses of weedy rice and upland rice to drought stress were investigated using weedy rice (heb07-2 and WR04-6) and upland rice (IAPAR9). Changes in physiological parameters of leaves and roots of weedy rice and upland rice at 20% polyethylene glycol 6000(PEG-6000) in an artificial climate chamber were investigated. The results showed that the physiological indexes of leaves and root of weedy rice and upland rice exhibited a different trend except for peroxidase(POD) and proline. The weedy rice heb07-2 leaves and roots had higher activities of superoxide dismutase(SOD), catalase(CAT), ascorbate peroxidase(APX) under drought stress. Due to less injury and membrane l ipid peroxidation, the cell of membrane of weedy rice heb07-2 remained intact. The soluble sugar and soluble protein contents of heb07-2 were higher than those of IAPAR9 and WR04-6 under drought stress. It indicated that weedy rice heb07-2 was less sensitive to drought at seedling stage.