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The development of winter wheat in the field. 2. The control of primordium initiation rate by temperature and photoperiod

Published online by Cambridge University Press:  27 March 2009

C. K. Baker  and
J. N. Gallagher
C. K. Baker
Affiliation:
University of Nottingham, School of Agriculture, Sutton Bonington, Loughborough, Leics.
J. N. Gallagher
Affiliation:
University of Nottingham, School of Agriculture, Sutton Bonington, Loughborough, Leics.
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Summary

A scheme was developed to describe how the rate at which apical primordia are initiated in cereals depends on temperature and photoperiod. It was used to analyse initiation in field crops of winter wheat (Triticum aestivum L., cv. Maris Huntsman).

For the initiation of leaves and spikelets, a straightforward linear regression of initiation rate R against mean air temperature (Ta) gave base temperatures (Tb) close to 0 °C for leaves and for spikelets. However, initiation rate was also correlated with mean photoperiod (P) and base photoperiods (Pb) of –0·5 h and 4h were established for leaf and spikelet initiation. When R was correlated with the index (T – Tb) (P – Pb), r2 was 0·62 for both leaves and spikelets.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 101 , Issue 2 , October 1983 , pp. 337 - 344
Copyright
Copyright © Cambridge University Press 1983

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