晾制期间白肋烟TN90叶绿体色素降解动态及呼吸强度的变化

通过田间试验,研究了晾制期间白肋烟TN90叶绿体色素的降解动态及呼吸强度、含水率、比叶重等的变化。结果表明,晾制期间TN90叶绿素(chl)、叶绿素a(chla)、叶绿素b(chlb)、类胡萝卜素等的含量均随叶位的升高而增加、随晾制进程的推进而下降,其降幅chla>chl>chlb>类胡萝卜素,下、中、上各叶位chla降幅最大的时段分别为0～6d、0～9d、0～12d,其余各类色素的降低幅度则比较平缓;chla/chlb及chl/类胡萝卜素的比值也随晾制进程的推进而下降,这有利于烟叶品质的改善。随着晾制过程中水分的散失,烟叶含水率逐渐下降,叶细胞生命活动也随之减弱,表现为呼吸强度和比叶重也随晾制进程及叶位下降而减小。

egradation of Chloroplast Pigments and Change of Respiratory Intensity in TN90 during Air-curing

The degradation of chloroplast pigments and changes of respiratory intensity, moisture content and specific leaf weight in TN90 during air-curing were studied by field experiments. The results showed that the contents of chl, chla, chlb and carotene in TN90 increased with the elevation of stalk position, decreased with the proceeding of air-curing, and chloroplast pigments in the order of decrease rate were chla>chl>chlb>carotene during air-curing. The durations of the highest decrease rate of chla in lower, middle and upper stalk positions were 0-6d, 0-9d and 0-12d, respectively. The other pigments decreased gently. The ratio of chla/chlb and chl/carotenoid (decreased) with the proceeding of air-curing, which was beneficial to leaf quality. Along with the moisture dissipating during air-curing, the moisture content in leaves decreased gradually, and the life activity of leaf cells was weakened also, which led to the decrease of respiratory intensity and specific leaf weight.