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以烤烟(Nicotiana tabacum)品种K 326为材料,采用稳定同位素13C标记技术,研究了烤烟圆顶后1周不同部位叶片、同一叶片不同区段的13C同化能力差异及同化物运输分配的特点,探讨了施氮量对烤烟叶片碳同化能力及同化物分配的影响。结果表明,烤烟不同部位叶片13C同化能力表现为中部叶>上部叶>下部叶;同一叶片不同区段13C同化能力依次为叶中部>叶基部>叶尖部。随施氮量增加,上部叶和下部叶的13C同化能力有增大的趋势,而中部叶的13C同化能力以中等施氮量处理(N2)最大。各部位叶片的13C同化产物主要分配于相应部位叶片及根和茎中,增加施氮量具有促进上部叶同化物向根部和茎部运输分配的趋势。
Tobacco (Nicotiana tabacum) cultivar K326 was used as a material to study the differences of 13C assimilation ability and assimilate transport and distribution in different parts of leaves and leaves of different parts of flue-cured tobacco domestically 1 week after domestication Effect of Nitrogen Application on Carbon Assimilation Ability and Assimilate Distribution in Flue - cured Tobacco Leaves. The results showed that the 13C assimilation ability of different parts of flue-cured tobacco showed the middle leaf> the upper leaf> the lower leaf. The 13C assimilation ability of different leaf segments in the same leaf was leaf central> leaf base> leaf tip. With the increase of nitrogen application rate, 13C assimilation ability of upper leaves and lower leaves tended to increase, while 13C assimilation capacity of middle leaves was the highest with medium nitrogen application (N2). The 13C assimilation products of leaves in all parts were mainly distributed in leaves and roots and stems of the corresponding parts. Increasing the amount of nitrogen fertilizer had the tendency of promoting the distribution of the upper leaves assimilates to roots and stems.