Characterization of responses to temperature and photoperiod for time to flowering in a world lentil collection.

Erskine, W. and Ellis, R.H. and Summerfield, R.J. and Roberts, E.H. and Hussain, A. (1990) Characterization of responses to temperature and photoperiod for time to flowering in a world lentil collection. Theoretical and Applied Genetics , 80 (2). pp. 193-199.

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Abstract

The time from sowing to first flowering (f) in 231 accessions of Lens culinaris, comprising germplasm from 8 countries and breeding lines from ICARDA in Syria, was recorded in 4 glasshouse environments: 2 photoperiods (16 and 13 h/day) combined with warmer (24°/13°C) and cooler (18°/9°C) day/night temperatures. The linear model 1/f = a + bT + cP (where T is mean diurnal temperature and P is photoperiod) provided an average fit over the 231 accessions of r² = 0.85. Since there is no interaction term in this linear model, the flowering responses of an accession to temperature and photoperiod are independent. The values of the constants b and c indicate relative responsiveness of rate of progress towards flowering (1/f) to temperature and photoperiod, respectively. Comparison among the 231 accessions showed a weak, but significant, negative correlation between the values of b and c (r = -0.29). Since the proportion of the variance of b not attributed to its linear regression on c was >0.91, it was concluded that these phenological responses are under separate control and that there is considerable scope for selection of any combination of sensitivities to temperature and photoperiod. A large proportion of the variation among accessions in mean time to first flowering was attributed to country of origin. Sensitivity to photoperiod (i.e. the value of constant c) was dependent upon latitude of origin.

Item Type: Article
Author Affiliation: ICARDA, PO Box 5466, Aleppo, Syria.
Subjects: Crop Improvement
Crop Improvement > Genetics/Genomics
Crop Improvement > Plant Breeding
Divisions: Other Crops
Depositing User: Mr B Krishnamurthy
Date Deposited: 31 Oct 2010 22:23
Last Modified: 31 Oct 2010 22:23
Official URL: http://dx.doi.org/10.1007/BF00224386
URI: http://eprints.icrisat.ac.in/id/eprint/329

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