Photo- and Thermo-Control of Flowering in Tobacco (Nicotiana tabacum L.)1
- M. J. Kasperbauer2
‘Burley 21,’ ‘Ky 151,’ and ‘Hicks’ (burley, dark-fired, and flue-cured types, respectively) tobacco seedlings (Nicotiana tabacum L.) were started and grown to the 5- to 6-leaf stage under long, warm days followed by exposure to controlled variations of light and temperature to determine combinations that cause these three types of tobacco to respond similarly and proceed from seed to flowering in minimum time. Tobacco plants became “ready for floral induction” after they developed 5 to 6 leaves. Long, warm days favored growth, while exposure of plants (that were “ready for floral induction”) to short, cool days favored floral induction. Uniformly early flowering of all three of the varieties occurred when they were grown under long, warm days to the 5- to 6-leaf stage; exposed to short, cool days for 2 to 3 weeks; then returned to long, warm days after floral induction and initiation to hasten growth and development of the flowers.
Varietal differences were evident when plants were kept on long days and/or warm temperatures. Under such conditions, Burley 21 flowered later and at a larger size than did Ky 151 and Hicks.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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