云南玉溪烟区两烟草品种叶片光合作用对光和CO_2的响应

通过大田试验,比较了云南玉溪烟区两个主栽烟草品种NC297和K326旺长初期叶片光合作用的光响应和CO2响应曲线特征。结果表明:两个品种的光合特性存在一定的差异,NC297最大净光合速率(Amax)、光补偿点(LCP)、光饱和点(LSP)、表观量子效率(AQY)、表观羧化效率(ACE)均较高,气孔限制值(Ls)低而气孔导度(Cs)大,由于NC297的净光合速率远大于K326,其水分利用效率(WUE)也较高。此外,NC297叶片的光合色素(叶绿素a、b和类胡萝卜素)和可溶性蛋白质含量也较K326高。试验说明,处于所选研究地的海拔高度和生态环境条件下,NC297比K326具有更高的羧化速率、光能利用效率以及对强光的适应能力,光合能力较大,水分利用效率高,其潜在的生产能力也比较大。

Photosynthetic Response to Light and CO2 of Two Tobacco Cultivars in Yuxi of Yunnan Province

The photosynthetic light-response curve and CO2-response curve characters of two main tobacco cultivars（Nicotiana tabacum L.var.K326 and NC297）of Yuxi Yunnan province were compared depending on field experiment data.The results showed that two cultivars had different photosynthetic characteristics.The maximum photosynthetic net rate（Amax）,light compensation point（LCP）,light saturation point（LSP）,apparent quantum yield（AQY）,apparent carboxylation efficiency（ACE） and stomata conductance（Cs） in NC297 were higher than that in K326.The water use efficiency（WUE） of NC297 was higher than K326 because of greater net photosynthetic rate（Pn） in NC297 than in K326.Furthermore,the photosynthetic pigments（including chlorophyll a,b and caroteniod）and soluble protein contents were higher in NC297 than in K326.The results indicated that NC297 had greater carboxylation rate,light use efficiency and adaptation to strong light,higher photosynthetic capacity and WUE,so it had higher potential manufacturability in the experiment region.