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Photo‐ and Thermo‐Control of Pretransplant Floral Induction in Burley Tobacco 1
Author(s) -
Kasperbauer M. J.
Publication year - 1969
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1969.00021962006100060021x
Subject(s) - photoperiodism , transplanting , horticulture , flower induction , biology , botany , incandescent light bulb , long day , darkness , topping , day length , sowing , chemistry
Burley tobacco was exposed to controlled variations of light and temperature in growth chambers during the pretransplant period to determine combinations that lead to more uniform growth and development during the post‐transplant period. Exposure of plants to certain photoperiod, light intensity, and temperature combinations resulted in floral induction before the plants attained transplant size. Although such plants did not have macroscopic floral buds at time of transplanting, many of them flowered within 3 or 4 weeks after being transplanted to the field. Early induction of flowering resulted in development of fewer leaves per plant, exclusive of those on suckers. Burley tobacco plants became ready for floral induction after they had developed five or six leaves. Plants exposed to high intensity, short photoperiods at 18 C or low intensity, “natural” (13.5‐hour) photoperiods at 18 C became florally inducted during the pretransplant period. Inductive effects of both of these environmental combinations were counteracted by exposing the plants to several hours of low intensity light from incandescent‐filament lamps, each night. Also, maintaining plants at 28 C instead of 18 C had the effect of opposing the inductive process.