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- Title
Histological and inheritance studies of partial resistance in theBrassica napus– Albugo candidahost–pathogen interaction.
- Authors
Bansal, V. K.; Tewari, J. P.; Stringam, G. R.; Thiagarajah, M. R.
- Abstract
Traditional and doubled haploid (DH) genotypes of oilseedBrassicaspp. resistant, partially resistant, moderately susceptible, and susceptible toAlbugo candidawere compared for phenotypic development of host–pathogen interaction and histology of host–pathogen interaction. The partially resistant genotype showed pinhead-size pustules, mainly on the upper surface of cotyledonary leaves. Relatively less mycelium was observed in the partially resistant genotype compared with the susceptible genotype. In resistantB. napusgenotypes, there was neither pustule development nor any mycelial growth. In the moderately susceptible genotype, the pustules were similar to those in the partially resistant genotype in being of pinhead-size and occasionally coalescing. However, ample mycelial growth in the mesophyll tissue in the moderately susceptible genotype was similar to that in the susceptible controlB. rapacv.‘Torch’. The susceptible genotypeB. rapacv.‘Torch’ also showed large coalescing pustules. In the non-hostB. junceacv.‘Commercial Brown’, no pustules were formed although some mycelial growth was observed beneath the epidermal cell layer and in the mesophyll cell layer of the cotyledonary leaf tissue. For inheritance studies, two partially resistantB. napusgenotypes were crossed with a resistantB. napusgenotype. Various generations viz., F1, F1(reciprocal), F2, and DHs produced from the crosses were inoculated with a zoospore suspension of race 7v ofA. candida.The partially resistant phenotype appeared to be controlled by a single recessive gene designated aswprwith variable expression. The simple inheritance of partial resistance has implications for disease resistance breeding against white rust, as this type of resistance can be easily incorporated into elite breeding lines through conventional and DH breeding methods.
- Subjects
RUTABAGA; OILSEED plants; PHYTOPATHOGENIC microorganisms; ALBUGO candida; ALBUGO; PLANT diseases; PLANT breeding
- Publication
Plant Breeding, 2005, Vol 124, Issue 1, p27
- ISSN
0179-9541
- Publication type
Article
- DOI
10.1111/j.1439-0523.2004.01063.x