학술논문
Identification of aBrassica juncea-derived recessive gene conferring resistance toLeptosphaeria maculansin oilseed rape.
Document Type
Article
Author
Source
Subject
*BRASSICA
*BRASSICACEAE
*GENES
*PLACENTA
*LEPTOSPHAERIA
*OILSEEDS
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*
*
*
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Language
ISSN
0179-9541
Abstract
Screening of 212 spring typeBrassica napuslines carrying B genome chromosome additions and introgressions fromB. nigra,B. junceaandB. carinataresulted in the identification of one line segregating for resistance toLeptosphaeria maculans(anamorphPhoma lingam) at the seedling (cotyledon) stage. This line was derived from an interspecific hybrid containing the B genome ofB. juncea. Trypan blue staining of cotyledons from resistant individuals demonstrated a hypersensitive response which is delayed in plants with intermediate lesion size. Genetic analysis supported the hypothesis of a monogenic recessive inheritance of resistance. The resistance gene, termedr j lm2, is effective in spring and winter type oilseed rape backgrounds against all tested virulent pathotypes, including two isolates which have been shown to overcome two dominant (race-specific) B genome-derived resistance genes inB. napus. [ABSTRACT FROM AUTHOR]