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The Journal of Heredity 1994:85(1):12-17
© 1994 The American Genetic Association 85:12-17

research-article

Flowering in Pisum: A Further Gene Controlling Response to Photoperiod

E. L. Arumingtyas, and I. C. Murfet

Department of Plant Science, University of Tasmania Hobart 7001, Australia

Address reprint requests to Dr. Murfet at the address above

Abstract

Two early-flowering mutants, M2/137 and M2/176, induced in the garden pea (Pisum sativum L.) cultivar Borek were characterized and identified. Borek was found to have a late-flowering, quantitaive long-day habit while both mutants were early-flowering, day-neutral types. The mutants showed monogenic recessive (M2/176) or partially recessive (M2/137) inheritance. Mutant M2/137 complemented with the two previously identified day-neutral mutants, sn and dne, and was assigned to a new locus contolling response to photoperiod, designated ppd. Mutant M2/176 proved to be allelic with sn. The ability to respond to photoperiod in pea is therefore conferred by the joint presence of the complementary genes Sn, One, and Ppd. Significant evidence (P < .002) was obtained for linkage (32 ±5 cM) between ppd and chromosome 1 marker a.


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