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Flowering in Pisum: A Sixth Locus, Dne
, Murfet I.C.
Annals of Botany
, 1985. V. 56. No. 6. P. 835–846
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Oxford University Press · firstname.lastname@example.org
A sixth major flowering gene, dne, is identified in the garden pea (Pisum salivum L.). Linkage tests show dne is located on chromosome 3 near locus st. The ability to respond to photoperiod depends on the joint presence of the dominant genes Sn and Dne which together confer a long day habit. Genotypes Sn dne, sn Dne and sn dne are all essentially day-neutral although by examining several flowering criteria under strictly controlled conditions some small responses could be demonstrated. Like sn, dne reduced the response to vernalization when substituted into genotype Sn Dne.It is suggested genes Sn and Dne both control steps in a biosynthetic pathway which leads to the production of a graft-transmissible inhibitor of flowering and apical senescence. Stocks of genotype Sn dne and sn Dne promoted flowering in Sn Dne scions while Sn Dne stocks delayed flowering in Sn dne (and sn Dne) scions. However, reciprocal grafting between genotypes Sn dne and sn Dne gave no evidence of physiological complementarity corresponding to the genetic complementarity ofSn and Dne. Initial results suggest dne may be less effective than sn at blocking inhibitor production but this requires confirmation.