Genetic Control of Green Banner, Keel and Seedcoat Color in Common Bean (Phaseolus vulgaris L.)

D. GENCHEV
Dobroudja Agricultural Institute, BG-9520 General Toshevo, Bulgaria

Abstract

GENCHEV, D., 2004. Genetic control of green banner, keel and seedcoat color in common bean (Phaseolus vulgaris L.). Bulg. J. Agric. Sci., 10: 153–159

Green color of the different plant parts is due to the chloroplasts containing chlorophyll a and chlorophyll b in various combinations. According to the plant organ, chlorophyll disintegrates at a certain stage of the plant's ontogeny and green color turns to white. The aims of this study were to determine the genetic control of green banner, keel and seedcoat color. P1, P2, F1, F2 and BC2 of 15 crosses between accessions with green and white seedcoat of immature seed, banner and keel were used. The linkage between Bpc and IW loci was determined with the program Mapmaker 3.0. Linkage distance was calculated as two-point data based on Kosambli mapping function.
In F2 the segregation of all three characters was close to the expected ratio 3 (green) : 1 (white). In the cross DG 91-10 ´ Dobroudjanski ran, gene linkage determining green seedcoat color of immature seed (IW) and greed banner color (Bpc), positioned at 26 cM at LOD 2.68, was established.
We suggest the symbols Kpc for the dominant allele controlling green color and kpc for the recessive allele controlling white color of keel's tip twisting; Bpc for the dominant allele controlling green color and bpc for the recessive allele controlling white color of banner. The cultivar Abritus with white banner and immature seedcoat and breeding line DG 91-10 with green banner and immature seedcoat were proposed as suitable example accessions.

Key words: Phaseolus vulgaris, common bean, seedcoat color, keel color, banner color, inheritance, linkage, DUS