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Controlled environments as an Adjunct to Field Research on Lentils (Lens culinaris). III. Photoperiodic Lighting and Consequences for Flowering†

Published online by Cambridge University Press:  03 October 2008

R. J. Summerfield ,
F. J. Muehlbauer  and
E. H. Roberts
R. J. Summerfield
Affiliation:
USDA-ARS, Legume Breeding and Production, 215 Johnson Hall, Washington State University, Pullman, WA 99164, USA
F. J. Muehlbauer
Affiliation:
USDA-ARS, Legume Breeding and Production, 215 Johnson Hall, Washington State University, Pullman, WA 99164, USA
E. H. Roberts
Affiliation:
USDA-ARS, Legume Breeding and Production, 215 Johnson Hall, Washington State University, Pullman, WA 99164, USA
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Summary

Six genotypes of lentil (Lens culinaris) were grown in pots in a glasshouse under natural photo-periods of 10–12 h, extended to an inductive photoperiod of 16 h by supplementary illumination from incandescent lamps. The illuminance of the supplementary light was varied by placing replicate pots at different distances from the lamps; it decreased geometrically with distance (i.e. down an illuminance gradient) from about 2000 lux directly beneath the lamps to about 40 lux at a distance of 6 m from them. All genotypes came into flower progressively later as illuminance decreased; those selected in northern temperate regions were especially sensitive, taking about twice as long to flower at an illuminance of 40 compared with 2000 lux. We suggest, however, that these quantitative responses do not reflect differences in sensitivity to illuminance per se, but are the consequences of genotypic differences in sensitivity to photoperiod. The implications of these data are discussed in terms of adaptation to the aerial environment and strategies for screening germplasm and plant breeding in lentils and other grain legumes.

Type
Research Article
Information
Experimental Agriculture , Volume 20 , Issue 1 , January 1984 , pp. 1 - 18
Copyright
Copyright © Cambridge University Press 1984

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