THE INHERITANCE OF SEED COAT COLOR IN B. CARINATA A. BRAUN AND AN EXAMINATION OF SEED QUALITY PARAMETERS AND THEIR TRANSFER FROM RELATED SPECIES (B. JUNCEA CZERN & COSS AND B. NAPUS L.).
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The inheritance of seed coat color in B. carinata was studied in crosses between two yellow seeded lines, and one brown seeded line. Seed coat color in these crosses was controlled by two alleles at one locus with repression of pigmentation incompletely dominant over pigment production. Agronomic and quality characteristics of B. carinata cultivars and lines were compared with those for B. napus, B. campestris and B. juncea cultivars. In tests at Saskatoon in 1984 and 1985 B. carinata cultivars and lines were lower in seed yield, oil percentage and fibre content but had higher protein levels than standard cultivars of other Brassica species. The association of seed coat color with seed weight, oil, protein and crude fibre content of B. carinata was investigated. Yellow seeded lines produced heavier seed (0.3 g/lOOO seeds), higher oil (2.2%) and protein (2.1%) and lower crude fibre content (1.3%) than brown seeded lines from the same genetic background. In addition, seed weight was positively correlated with oil and protein and negatively correlated with fibre content in both yellow and brown seeded populations. Low erucic acid plants were grown from half seeds of the BC1F2 generation of the interspecific cross of (B. carinata cv. S-67 X B. juncea Zem 2330) X (B. carinata cv. Dodola). The presence of low erucic alleles in both genomes of these low erucic acid plants may have resulted from either a substitution of all or part of a chromosome or from crossing over between chromosomes of the A and C genomes. The development of low glucosinolate B. carinata was studied in an interspecific cross involving the allylglucosinolate type B. carinata cv. Dodola and the 3-butenylglucosinolate type B. juncea line 60143. Three allylglucosinolate type BClF2 plants with an approximately 50% reduction in allylglucosinolate content were identified following a backcross to the cultivar Dodola. It has been demonstrated that interspecific crossing of selected B. carinata and B. juncea lines can be used in the development of low erucic, reduced glucosinolate B. carinata. A canola quality B. carinata should result from further interspecific crosses with B. napus.