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Inheritance of resistance to the peach root‐knot nematode ( Meloidogyne floridensis ) in interspecific crosses between peach ( Prunus persica ) and its wild relative ( Prunus kansuensis )
Author(s) -
Maquilan Mary Ann D.,
Olmstead Mercy A.,
Dickson Donald W.,
Chaparro José X.
Publication year - 2018
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/pbr.12624
Subject(s) - biology , prunus , root knot nematode , locus (genetics) , meloidogyne incognita , nematode , botany , rootstock , interspecific competition , horticulture , genotype , genetics , gene , ecology
The peach root‐knot nematode, Meloidogyne floridensis ( MF ), infects majority of available nematode‐resistant peach rootstocks which are mostly derived from peach ( Prunus persica ) and Chinese wild peach ( P. davidiana ). Interspecific hybridization of peach with its wild relative, Kansu peach ( P. kansuensis ) , offers potential for broadening the resistance spectrum in standard peach rootstocks. We investigated the inheritance of resistance to MF in segregating populations of peach (‘Okinawa’ or ‘Flordaguard’) × P. kansuensis . A total of 379 individuals from 13 F 2 and BC 1 F 1 families were challenged with a pathogenic MF isolate “MFGnv14” and were classified as resistant (R) or susceptible (S) based on root galling intensity. Segregation analyses in F 2 progeny revealed the involvement of a major locus with a dominant or recessive allele determining resistance in progeny segregating 3R:1S and 1R:3S, respectively. Testcrosses with a homozygous‐susceptible peach genotype (‘Flordaguard’ or ‘ UFS harp’) confirmed P. kansuensis as a source of new resistance and the heterozygous allelic status of P. kansuensis at the locus conferring resistance to MF . We propose a single‐locus dominant/recessive model for the inheritance of resistance.