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Flowering in Pisum: A Fifth Locus, Veg
, Murfet I.C.
Annals of Botany
, 1984. V. 53. No. 3. P. 369–382
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In addition to the known loci, If, e, sn and hr, a fifth locus, veg, is shown to control flowering in peas. Regardless of the genotype for the other flowering genes, plants homozygous for the gene veg did not initiate flower buds under a wide range of photoperiod and temperature regimes, including those normally highly promotory in peas. Treatment with various plant growth substances and grafting to stocks known to promote flowering also failed to cause initiation. Gene veg prevented expression of allelic differences at the If locus but segregation for alleles at the sn and hr loci was clearly visible by examination of several vegetative characteristics. For example, sn hr veg and Sn hr veg plants showed an opening of the apical bud, production of lateral branches, and a reduction in growth rate, leaflet size, internode length and stem thickness at approx the same time as sn hr Veg and Sn hr Veg plants carrying the Lf allele commenced fruit production, respectively. The graft-transmissible inhibitor controlled by gene Sn is therefore not specific for the transition from vegetative to reproductive growth. Gene veg allows the processes leading to apical and foliar senescence to be examined independently of any effect of flowering and fruiting. We found that gene Sn influenced the total number of leaves expanded in veg plants but not the time of shoot senescence, which, in plants without flowers and fruits appeared to result from failure of the root system.