Premium
Identification of QTL for agronomic traits and resistance to white mold in wild and landrace germplasm of common bean
Author(s) -
Mkwaila Wezi,
Terpstra Karolyn A.,
Ender Marcio,
Kelly James D.
Publication year - 2011
Publication title -
plant breeding
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.583
H-Index - 71
eISSN - 1439-0523
pISSN - 0179-9541
DOI - 10.1111/j.1439-0523.2011.01876.x
Subject(s) - biology , sclerotinia sclerotiorum , quantitative trait locus , germplasm , phaseolus , population , backcrossing , plant disease resistance , horticulture , white (mutation) , agronomy , genetics , gene , demography , sociology
With 1 figure and 5 tablesAbstract White mold, caused by Sclerotinia sclerotiorum (Lib.) De Bary, is a serious yield reducing fungal pathogen of common bean ( Phaseolus vulgaris L.). Our objective was to identify QTL for resistance to white mold from wild and landrace accessions of common bean using two inbred backcross line (IBL) populations derived from the recurrent black bean parent ‘Tacana’. Selective phenotyping failed to detect QTL for field disease resistance but other agronomic traits less sensitive to environmental conditions or population size were detected. Four novel QTLs for white mold resistance WM3.3 TW , WM7.5 TL , WM9.2 TW , and WM11.1 TL were identified in the greenhouse straw test on linkage groups B3, B7, B9, and B11, respectively, and two previously mapped QTL were also validated on B2 and B4. QTL, SY2.1 TL that accounted for 19–37% of the variation for yield under white mold pressure over 3 years, was detected on B2 in the TL population. Enhanced resistance to white mold in common bean could be achieved by combining different QTL associated with physiological resistance with yield under disease pressure.