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Published in Crop Sci 15:732-733 (1975)
© 1975 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Temperatures in Early Post-Transplant Growth: Influence on Leaf and Floral Initiation in Tobacco1

C. David Raper, Jr., Judith F. Thomas, Mien Wann and Emory K. York2

The quantitative effects of temperature on apical meristem and leaf development were investigated in a flue-cured cultivar of tobacco (Nicotiana tabacum L.). while the interval between emergence and expansion of successive leaves was progressively reduced by increasing temperatures after transplanting, the plastochron (or interval between differentiation of successive primordia) was increased by increasing temperatures. An apparent lag period, during which little evidence of activity was observed for apical meristem development, was prolonged for the highest and lowest temperatures. The day/night temperatures included in the study were 18/14, 22/18, 26/22, 30/26, and 34/30 C.

Key Words: Plastochron • Thermoperiod • Nicotiana tabacum L. • Rate of leaf production

1 Paper no. 4616 of the journal series of the N.C. Agric. Exp. Stn., Raleigh, N.C. This study was supported by NSF (RANN) Grant GI-39230. Operation of the Phytotron is supported in part by NSF Grant 19650.

2 Associate professor, research associates, and agricultural research technician, Dep. of Soil Sci., N.C. State Univ., Raleigh, NC 27607.

Received for publication February 10, 1975.




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