Effects of temperature and photoperiod on flowering in lentils (Lens culinaris Medic.).

Summerfield, R.J. and Roberts, E.H. and Erskine, W. and Ellis, R.H. (1985) Effects of temperature and photoperiod on flowering in lentils (Lens culinaris Medic.). Annals of Botany , 56 (5). pp. 659-671.

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Factorial combinations of photoperiods (10, 13 and 16 h), day temperatures (18 and 28°C) and night temperatures (5 and 13°C) were imposed on nodulated plants of 6 diverse genotypes (cultivars and land races) grown in pots in growth cabinets from vernalized (1.5 ± 0.5°C for 30 days) or nonvernalized seeds (i.e. 144 treatment combinations). The times from sowing to the appearance of first open flowers were recorded. Vernalization, long days and warm temperatures hastened flowering but genotypes differed in relative sensitivity to each of these factors and in time to flowering in the same environment. Rates of progress towards flowering (i.e. 1/f, the reciprocals of the times to first flower, f) in all genotypes, vernalized or not, were linear functions of both mean temperature, t̄, and photoperiod, p, with no interaction between the 2 terms. It is suggested that over a wide range of conditions (covering the photothermal regimes experienced by lentil crops world-wide), time to flowering can be described by the equation: 1/f = a + bt̄ + cp where a, b and c are constants which differ between genotypes and the values of which provide a sound basis for screening germplasm for sensitivity to temperature and photoperiod. Although these 2 environmental factors affect the same phenological event (i.e. time to flowering), the data suggested that the responses are under separate genetic control. Seed vernalization consistently increased the values of both a and b in all genotypes. The implications of these collective findings for the screening of lentil germplasm are discussed with particular emphasis on developing simple field screening procedures for foreign germplasm in the Indian subcontinent.

Item Type: Article
Author Affiliation: Pl. Environment Lab., Dep. Agric. & Hort., Univ. Reading, Shinfield Grange, Cutbush Lane, Shinfield, Reading, Berks RG2 9AD, UK.
Subjects: Crop Improvement
Crop Improvement > Genetics/Genomics
Crop Improvement > Plant Breeding
Plant Physiology and Biochemistry > Plant Physiology
Plant Physiology and Biochemistry > Biochemistry
Divisions: Other Crops
Depositing User: Mr B Krishnamurthy
Date Deposited: 31 Oct 2010 22:31
Last Modified: 31 Oct 2010 22:31
URI: http://eprints.icrisat.ac.in/id/eprint/324

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