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Variations in chlorosis and potential usefulness of alloplasmic Brassica rapa with the cytoplasm of male sterile Brassica juncea
- Chang, Caitao, Sun, Deling, Hondo, Kana, Kakihara, Fumika, Chevre, A.‐M.
- Plant breeding 2014 v.133 no.5 pp. 620-623
- Brassica juncea, Brassica rapa, backcrossing, carotenoids, chlorophyll, chlorosis, cytoplasm, hybrids, inbred lines, leaves, male fertility, parents, temperature, vegetables
- To select superior seed parents for vegetable hybrid seed production, we conducted interspecific crosses between male sterile Brassica juncea (2n = 36, AABB) and eight inbred lines of Brassica rapa (2n = 20, AA). Alloplasmic lines of B. rapa with the cytoplasm of B. juncea were developed from B. juncea × B. rapa hybrids by repeated backcrossing using B. rapa as the recurrent male parent until the BC₃ generation. Seed fertility, male sterility and chlorophyll content were investigated in these plants cultivated under four different temperature conditions (5, 10, 12 and 20°C). At 10°C, the alloplasmic lines of B. rapa with the cytoplasm of B. juncea were male sterile with partly chlorotic leaves. The alloplasmic B. rapa had lower chlorophyll a, chlorophyll b and carotenoid contents than those of the original B. rapa. The leaves recovered from chlorosis when the plants were cultivated at 20°C. An alloplasmic line of B. rapa (A6) is available as a seed parent for vegetable hybrid seed production and contributes seed fertility, slight chlorosis and stable male sterility.