不同基因型烤烟旺长期的植物学性状和光合特性

Botanical properties and photosynthetic characteristics of different genotypes of flue-cured tobacco in rapid growth stage

为了进一步探讨烤烟生长特性,研究了不同基因型烤烟(K326、毕纳1号、韭菜坪2号、贵烟2号和南江3号)旺长期(移栽后50、65、80 d)的植物学性状和光合参数的变化。结果表明:毕纳1号、贵烟2号和K326大田旺长期的植物学性状较好,生物量较大;移栽后50 d和65 d,不同基因型烤烟SPAD值差异显著,移栽后80d,不同基因型间(除南江3号)SPAD值差异均不显著,且叶绿素相对含量有所降低;大田旺长期,南江3号、毕纳1号和K326叶绿素相对含量较高,韭菜坪2号和贵烟2号叶绿素相对含量较低,毕纳1号、K326和南江3号光合特性较好;韭菜坪2号的植物学性状和光合特性相对较差,贵烟2号光合特性指标一般。

To further explore the growth characteristics of flue-cured tobacco, the changes of botanical properties and photosynthetic characteristics in different genotypes of flue-cured tobacco（K326, Bina1, Jiucaiping2, Guiyan2 and Nanjiang3） during rapid growth stage were investigated. The results indicated that Bina1, Guiyan2 and K326 had good botanical properties in rapid growth phase, especially for plant dry matter. The SPAD value of different flue-cured tobacco genotypes was significantly different at 50 d and 65 d after transplanting, but not significantly different at 80 d（except for Nanjiang3） and relative content of chlorophyll was decreased. In the rapid growth stage, Nanjiang3, Bina1 and K326 had higher relative chlorophyll content, but that of Jiucaiping2 and Guiyan2 were lower. At the same time, photosynthetic character parameters of Bina1 and K326 and Nanjiang3 were better. Jiucaiping2 had worse botanical properties and photosynthetic characteristics, but with easy curing potential above the medium level meanwhile Guiyan2 had medium level photosynthetic character parameters, with easy curing potential much better.