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Inheritance of resistance to the ‘Kanpur’ race of Phytophthora drechsleri in pigeonpea
Author(s) -
Singh I. P.,
Chaudhary R. G.,
Katiyar P. K.,
Dua R. P.,
Robbelen G.
Publication year - 2003
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 - 10.1046/j.1439-0523.2003.00804.x
Subject(s) - biology , backcrossing , race (biology) , genetics , resistance (ecology) , gene , dominance (genetics) , inheritance (genetic algorithm) , blight , veterinary medicine , botany , agronomy , medicine
Phytophthora drechsleri causes stem blight, which is one of the most serious diseases of pigeonpea. Eight races of this fungus have been identified, but the inheritance of resistance to all these races is not clear except for race P2. This study examined the inheritance of resistance to race ‘Kanpur’ (KPR) of P. drechsleri in eight crosses involving four resistant parents, viz.‘KPBR 80‐2‐1′, ‘KPBR 80‐2‐2′, ‘Hy 3C and ‘BDN 1′, and two susceptible parents, viz.‘Bahar’ and ‘PDA 10′. The reactions of the parental lines, and their F 1 , F 2 and backcross generations were studied in an infected plot. In the F 1 generation of all crosses, a susceptible reaction was observed that indicated dominance of susceptibility over resistance. The segregation pattern in F 2 indicated that two homozygous recessive genes (pdr 1 pdr 1 pdr 2 pdr 2 ) were responsible for imparting resistance in the parents, ‘KPBR 80‐2‐1’ and ‘KPBR 80‐2‐2′, and that a single homozygous recessive gene (pdrpdr) was responsible for resistance in the parents ‘Hy 3C and ‘BDN 1′. Therefore, ‘KPBR 80‐2‐1’ and ‘KPBR 80‐2‐2’ with two genes for resistance are better donors because the resistance transferred from them will be more durable compared with ‘Hy3C and ‘BDN1’ with only one gene for resistance.