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Floral Induction of Downy Brome (Bromus tectorum) as Influenced by Temperature and Photoperiod

Published online by Cambridge University Press:  12 June 2017

Jesse M. Richardson ,
Larry A. Morrow  and
David R. Gealy
Jesse M. Richardson
Affiliation:
Dep. Agron. and Soils, Washington State Univ., Pullman, WA 99164
Larry A. Morrow
Affiliation:
Nu Chem Ltd., P.O. Box 391, Colfax, WA 99111
David R. Gealy
Affiliation:
Nu Chem Ltd., P.O. Box 391, Colfax, WA 99111
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Abstract

Seedling vernalization was more effective than seed vernalization in promoting flowering of downy brome (Bromus tectorum L. # BROTE). Vernalizing imbibed downy brome caryopses at 3 C for 0 to 30 days did not induce rapid flowering when the caryopses were planted. Downy brome seedlings were exposed for 30 days to six photoperiod/temperature treatments. After subsequent transfer to long days, plants from the short-day/3 C treatment flowered within 30 days. Flowering was delayed or was absent in treatments with higher temperatures or long days. The shoot apex increased in volume during the short-day/3 C vernalization period. Two days following vernalization, floral initiation had occurred. By day 5, lateral organs had proliferated. Rudimentary glumes and lemmas were visible by day 8.

Keywords

Vernalizationfloweringfloral initiationinflorescencephotomicroscopyBROTE
Type
Weed Biology and Ecology
Information
Weed Science , Volume 34 , Issue 5 , September 1986 , pp. 698 - 703
Copyright
Copyright © 1986 by the Weed Science Society of America 

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