Photoperiod response characteristics controlling flowering of nine crop species

Major, D.J. (1980) Photoperiod response characteristics controlling flowering of nine crop species. Canadian Journal of Plant Science, 60 (3). pp. 777-784.

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The flowering response of 2 cv. of each of the long-day spp. wheat, oats, rye, Polish rape (Brassica campestris), Argentine rape (B. napus) and oilseed flax and the short-day spp. sorghum and soyabeans to photoperiods of 12-24 h at 1-h intervals was studied in controlled environment cabinets. In long-day spp. the relationship between time to heading or 1st flower and photoperiod was linear and decreased as photoperiod increased to the min. opt. photoperiod (MOP). Within the range of opt. photoperiods the number of days to heading or flowering was constant and provided a measure of the length of the basic vegetative phase (BVP). The slope of the response line obtained in non-opt. photoperiods provided an estimate of photoperiod sensitivity. The characterisitcs MOP, BVP and photoperiod sensitivity were equally valid for the short-day spp. except that as daylength increased there was a linear increase in time to flowering as daylength increased above a max. opt. photoperiod. For 3 of 4 short-day cv. there was also a critical photoperiod above which flowering occurred in a constant number of days. Data suggested separate genetic controls for each of the response characteristics

Item Type: Article
Author Affiliation: Research Station, Agriculture Canada, Lethbridge, Alberta, Canada T1J 4B1
Subjects: Crop Improvement > Genetics/Genomics
Crop Improvement > Plant Breeding
Plant Physiology and Biochemistry > Plant Physiology
Plant Physiology and Biochemistry > Biochemistry
Divisions: Sorghum
Depositing User: Ms K Syamalamba
Date Deposited: 03 Aug 2012 03:32
Last Modified: 03 Aug 2012 03:34

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