外源糖调节不同碳氮比对烤烟生理生化特性及化学成分的影响

通过外源葡萄糖调节营养液的碳氮比,研究了不同碳氮比对烤烟生理生化特性及化学成分的影响,结果表明,和对照相比,不同碳氮比处理均能提高叶片叶绿素的含量;碳氮比为0.5时,叶片硝酸还原酶的活性最强;蔗糖转化酶活性和淀粉酶活性(碳氮比为0.75处理除外),以碳氮比为0.5的处理最高;随碳氮比的升高各处理氮、钾含量呈现先升后降的趋势,磷含量则一直升高;各处理烟叶总糖含量都较对照高,其中以碳氮比为0.4,0.5,0.75处理效果较明显;还原糖含量表现为:碳氮比0.5>碳氮比0.4,0.75>碳氮比0.2,1.5。

Effect of Different C/N Ratio on Physiological and Biochemical Characteristics and Chemical Components of Flue-cured Tobacco

This paper studied the effects of different C/N ratio adjusted by glucose on the physiological and biochemical characteristics and chemical components of flue-cured tobacco using water-culture method.The results showed that all the C/N ratio treatments could increase the content of leaf chlorophyll a and chlorophyll b compared with CK.The activity of nitrate reductase increased with the increase of C/N ratio when C/N was under 0.5,but it was restrained when C/N exceeded 0.5.The highest activities of leaf invertase and amylase were from the 0.5 C/N treatment.With the increase of C/N ratio,the N and K contents of flue-cured tobacco increased and then decreased,but P content increased all the way.The total sugar content of tobacco was all higher in C/N ratio treatments than that in CK.The reduced sugar content was the highest for C/N treatment 0.5,followed by 0.4 and 0.75,then 0.2 and 1.5.