叶绿素含量与草坪草对叶枯病抗病性的关系

以16个草坪草品种为材料,测定了感病品种Granda、RebelⅢ、RebelJ、SR8500 和抗病品种SR5100、Franklin、Reliant、SR5200E等感染叶枯病后的叶绿素含量,以未发病叶为对照,结果表明:叶绿素含量在未发病叶中与田间发病率之间呈极显著负相关关系,相关系数r=-0.872**,且极显著相关(P<0.01)。叶枯病导致草坪草病叶叶绿素含量显著下降,其叶绿素含量下降幅度为12.3~31.8%。抗病品种叶绿素含量下降幅度低于感病品种,表明叶绿素含量的变化与草坪草的抗病性有关。

Relationship between chlorophyll and resistance to leaf blight of turfgrass

The infected leaves and healthy leaves of susceptible varieties Granda、RebelⅢ、RebelJ、SR8500 and resistant varieties SR5100、Franklin、Reliant、SR5200E were tested for their contents of cholorophyll and field disease incidence .The results showed relative index was-0.872~(**).Compared with the healthy leaves ,chlorophyll content in the diseased leaves were reduced from 12.3% to 31.8%. The resistant cultivar showed a lower decrease rate of cholorophyll content than the susceptible cultivar. That results indicated the change of chlorophyll content was related to the resistance of turf grass.