Abstract
Meiosis, trisomic transmission, and inheritance of erucic acid content were studied in a nucleolar trisomic (No. 2891) and a non-nucleolar trisomic (No. 2881) of Brassica campestris. The two trisomics originated from a B. campestris-alboglabra monosomic addition line whose alien chromosome carried the gene for erucic acid content. Meiotic analyses revealed that the trivalent frequencies in the pollen mother cells (PMCs) at diakinesis/metaphase I were 33.3% and 20% in No. 2891 and No. 2881, respectively. The transmission rates of the extra chromosome through the ovule in No. 2891 and No. 2881 were about 30.6% and 32.4%, respectively. The inheritance of erucic acid content was investigated in the two crosses, No. 2891 ×B. campestris landrace “Wu Chang Bei You Cai” and No. 2881 ×B. campestris landrace “Xi Shui You Cai Bei”. The segregation of erucic acid content in the F2 progenies of the selfed trisomic F1 plants from the two crosses showed a disomic inheritance pattern, thus indicating that the trisomy in No. 2891 and No. 2881 did not involve the chromosome carrying the erucic acid gene. The genetic divergence of homoeologous chromosomes between B. campestris and B. alboglabra is discussed.
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