Impacts of Night Temperature on Main Endogenous Hormones Content in Seeding Top of Flue-cured Tobacco

doi:10.3969/j.issn.1000-6362.2015.04.013

Abstract

Abstract: Taking tobacco cultivars of ‘Yunyan 87’, ‘K326’, ‘Zhongyan100’ and ‘Hongda’ as materials to analyze the effect of night temperature on the contents of GA3 (crown gibberellin), IAA (crown auxin) and CTK (crown cytokinins) in flue-cured tobacco, by using man-made climate chambers. The results showed that, under continuous treatment with increasing night temperature for 25 days, there was a temperature turning point between night temperature and the tobacco seedling crown endogenous hormone in all of flue-cured tobacco, the temperature turning point of CTK was 11℃ or 15℃, while that of GA3 was 11℃. The peak value of hormone contents was at 5 to 20 days after their seedling. The increasing night temperature was benefit to the accumulation of CTK and IAA in top seeding of flue-cured tobacco, the content of CTK of ‘Yunyan 87’ reached to the peak value with 51.23mol·L-1, after 20 days under 11℃ treatment, while its content of IAA reached to the peak value with 29.27mol·L-1 after 5 days. The content of CTK of ‘Zhongyan 100’ reached to the peak value with 51.03mol·L-1, after 10 days in 11℃ treatment, while its content of IAA reached to the peak value with 32.72mol·L-1 after 5 days. The content of CTK of ‘K326’ reached to the peak value with 44.65mol·L-1 after 10 days in 15℃ treatment, while its content of IAA reached to the peak value with 35.47mol·L-1 after 20 days in 19℃ treatment. The content of CTK of ‘Hongda’ reached to the peak value with 50.61mol·L-1 after 15 days in 19℃ treatment, while its content of IAA reached to the peak value with 29.57mol·L-1 after 20 days.

Key words: Flue-cured tobacco, Night temperature, Variety, Endogenous hormones, High altitude, Chemical property

ZHOU Yue, FAN Xing-long, ZHOU Zi-fang, LIU Xiao-ying, ZHOU Ji-heng, HE Dan-feng, CHENG Chu, YANG Ying-ming. Impacts of Night Temperature on Main Endogenous Hormones Content in Seeding Top of Flue-cured Tobacco[J]. Chinese Journal of Agrometeorology, 2015, 36(04): 489-496.

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