摘要
在 10～ 35℃范围内处理烤烟苗 7d ,于大十字期、生根期及成苗期进行测定 ,结果表明 ,温度过高或过低都不利于烟苗生长及光合作用。对烟苗各生育期生长及光合作用最适宜的气温为2 5℃左右 ,这时 ,烟苗的叶面积、地上部干重与鲜重、根系生长发育以及单株干重与鲜重的生长最佳 ,根 /冠比值最大 ;其净光合速率最强 ,气孔导度最大 ,气孔阻力最小 ,叶绿素含量较多 ,蒸腾速率强 。
The tobacco seedings were experimentally treated from 10℃ to 35℃ for one week. The analytical results in big cross period,rooting period and transplanting period of tobacco seedlings showedthat either high or low temperature was not good for growth and photosynthesis of tobacco seedlings.The optimum air temperature was about 25 ℃ in all growth stages of tobacco seedlings,which had the best effects in leaf area,dry weight and fresh weight of top and plant,growth and development of root system,root:top ratio,which had the highest net photosynthetic rate,the largest stomatal conductance, the rich chlorophyll content,strong transpiration rate and good water metabolism.
关键词
烟苗
温度影响
生长特性
光合特性
tobacco seedlings
temperature effect
growth characteristic
photosynthetic characters
