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随烟叶成熟进程推进 ,可溶性总糖、还原糖、淀粉及比叶重增加 ,过熟时稍有回落 ,峰值下、中、上各部位分别在封顶后第 3,4 ,5周 ,正置其适熟期 ,且各时期的值是上部叶 >中部叶 >下部叶 ;chla ,chlb ,类胡萝卜素 (CTk)下降 ,但降幅是chla >chlb >CTk ,致使chla/chlb ,chl/CTk比值减小 .以上生理生化变化与白肋烟的生长发育吻合 ,证实在当地生态环境和栽培措施下 ,TN90上、中、下各叶位成熟期分别为封顶后 3,4 ,5周 ,兼顾三部位 ,封顶后第四周砍株晾制 ,可获最佳品质 .这为诊断白肋烟成熟及适时砍收提供了技术参数和理论依据
With the progress of maturation of tobacco leaves, soluble total sugar, reducing sugar, starch and specific leaf weight increased over-ripe slightly down, the peak, middle and upper parts were capped at 3, 4, 5 weeks, The values of chla, chlb and carotenoid (CTk) decreased in the upper leaves> middle leaves> lower leaves, but decreased in the order of chla> chlb> CTk, resulting in a decrease in the ratios of chla / chlb and chl / CTk The above physiological and biochemical changes were in good agreement with the growth and development of burley tobacco, confirming that under the local ecological environment and cultivation measures, the upper, middle and lower leaves of TN90 were mature at 3,4, 5 weeks after capped, taking into account the three parts , The fourth week after capped Hanging system, will be the best quality.This is the diagnosis of burley mature and timely harvesting provided technical parameters and theoretical basis