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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.