烟草叶表腺毛密度与白粉病发生关系初步研究

以4种叶表腺毛密度有明显差异的烤烟品种为供试植物材料,分析了烟草叶表腺毛密度对白粉病发生的影响,并探讨了其可能的影响机制。结果表明:4种供试烟草旺长期植株中部叶片的叶表腺毛密度由大到小依次为大白筋599(6.3个/视野)、云烟85(5.6个/视野)、CF205(3.4个/视野)、革新3号(3.2个/视野),且大白筋599和云烟85的腺毛密度显著大于CF205和革新3号(P<0.05),充分发病后,大白筋599和云烟85叶片上的白粉病发生程度则极显著低于CF205和革新3号(P<0.01)。这表明烟草叶表腺毛密度越大,其白粉病发生程度越轻,分析其原因可能与腺毛及其分泌物对烟草叶表物理性状的修饰有关。

Preliminary Study on Relationship between Density of Tobacco Glandular Trichome and Tobacco Powdery Mildew

The effect and its action mechanism of glandular trichome density on the occurrence of tobacco powdery mildew were researched using four flue-cured tobacco varieties with obviously different density of glandular trichome.The results showed that the glandular trichome density of Dabaijin599(6.3 trichomes per field),Yunyan85(5.6 trichomes per field),CF205(3.4 trichomes per field) and Gexin3(3.2 trichomes per field) was at a decreasing trend,with Dabaijin599 and Yunyan85 significantly higher than CF205 and Gexin3(P<0.05),but the disease severity of powdery mildew on the four tested tobacco varieties showed the contrary results(P<0.01).These results indicated that the higher density of trichome on tobacco leaf,the lighter tobacco powdery mildew occurred,and this relationship might relate to the modification effects of tobacco glandular trichome as well as its secretion on the physical property of tobacco leaf.