电导法配合叶片SPAD值鉴定橡胶树无性系的抗旱性

以田间鉴定为依据,选择橡胶树6个优树无性系为材料,对叶片的相对电导率、相对含水量、持水力及SPAD值进行测定。结果表明,在干旱胁迫期间,橡胶树不同无性系的叶片相对电导率和含水量存在极显著差异,表现出抗旱性强的无性系其相对电导率低,相对含水量高,测定的SPAD值也相对较高;相关性分析表明,SPAD值与胁迫后电导率上升幅度、相对含水量及胁迫21 h持水力间呈显著相关(P0.05)。运用电导法配合叶片SPAD值对橡胶树种质资源的抗旱性进行规模化筛选简便快捷,结果具有一定可靠性。

The Identification of Hevea brasiliensis Clones to Drought Resistance by Conductivity Combined with Leaf SPAD Value

Six plus-tree clones of Hevea brasiliensis were selected to determine the relative conductivity, relative water content, water holding capacity and SPAD value in leaves. The results showed that there was a greatly significant difference between relative conductivity and water content among clones under drought stress. Some clones with stronger drought resistance had lower relative conductivity, higher relative water content and higher SPAD value. Correlation analysis showed that the SPAD value was significant correlated with the increasing of electrical conductivity being drought stress, relative water content and water holding capacity in stress for 21 hours (p<0.05). It`s found that it is convenient and quick to screening largely the Hevea germplasm with drought resistance by using conductivity combined with leaf SPAD value, and the result obtained seems to be reliable.