淮山优良品种“桂淮”抗旱性研究

A Study of Drought Resistance of Fine Varieties of Dioscorea opposita "Gui-Huai"

选择淮山优良品种"桂淮"进行耐旱性研究,通过设置不同干旱胁迫水平及胁迫后复水试验,研究其对不同干旱胁迫强度的响应与调节。结果表明:在干旱胁迫下,光合色素含量先下降、后上升、再下降,使光合反应正常进行;淮山叶片中SOD、丙二醛等保护酶活性提高并协同作用,减少了活性氧对细胞的伤害。对干旱胁迫后的淮山进行一定时间的复水,可使植株生理生化指标恢复到对照水平,对淮山的生长具有补偿作用。

The fine varieties of Dioscorea opposita"Gui-Huai"were selected for drought resistance research.The strength of different drought stress response and regulation were investigated by different levels of drought stress and retum water testing.Results showed that the photosynthetic pigment contents first decreased,then increased and last decreased under drought stress,which made the photosynthesis reaction normally.The SOD and Malondialdehyde of dioscorea opposita leaves made the activity of protective enzyme increase and synergies,which made the reactive oxygen reduce to damage the cells.After drought stress for a certain period of water,plant physiology and biochemistry index returned to control levels,which had a compensation effect on growth of dioscorea opposita.