Inheritance of a Chlorophyll Deficiency in Diploid Alsike Clover1

Abstract

Inheritance of a variegated chlorophyll deficiency in diploid alsike clover (Trifolium hybridum L.), was determined under greenhouse conditions. The variegated character was first observed in the S2 progeny of a normal green S1 clone. The S2 progeny segregated 9 green: 7 variegated plants. Reciprocal F1 progenies of this S1 clone and another S1 clone whose S2 progeny was normal green in color, were green also. The F2 data fit phenotypic ratios of 9 green: 7 variegated plants or 3 green: 1 variegated plant depending upon the genotype of the F1 parent. F2 intercross progenies were grown to confirm the F2 segregations and to assign genotypes to several F2 plants.Two recessive genes controlled the chlorophyll deficiency. The homozygous recessive conditions for either pair or both pairs of allcles produced the variegated character and the gene symbols v1 and v2 were suggested for the two loci.