| Autor: |
Karim MM; Laboratory of Plant breeding, Graduate School of Science and Technology, Niigata University , 2-8050, Ikarashi, Niigata 950-2181 , Japan ; Oilseed Research Centre, Bangladesh Agricultural Research Institute , Gazipur-1701 , Bangladesh., Siddika A; Oilseed Research Centre, Bangladesh Agricultural Research Institute , Gazipur-1701 , Bangladesh., Tonu NN; Laboratory of Plant breeding, Graduate School of Science and Technology, Niigata University , 2-8050, Ikarashi, Niigata 950-2181 , Japan ; Department of Plant Pathology, Sher-e-Bangla Agricultural University , Sher-e-Bangla Nagar, Dhaka-1207 , Bangladesh., Hossain DM; Department of Plant Pathology, Bangladesh Agricultural University , Mymensingh-2202 , Bangladesh., Meah MB; Department of Plant Pathology, Bangladesh Agricultural University , Mymensingh-2202 , Bangladesh., Kawanabe T; Laboratory of Plant breeding, Graduate School of Science and Technology, Niigata University , 2-8050, Ikarashi, Niigata 950-2181 , Japan., Fujimoto R; Laboratory of Plant breeding, Graduate School of Science and Technology, Niigata University , 2-8050, Ikarashi, Niigata 950-2181 , Japan., Okazaki K; Laboratory of Plant breeding, Graduate School of Science and Technology, Niigata University , 2-8050, Ikarashi, Niigata 950-2181 , Japan. |
| Abstrakt: |
Brassica napus is a leading oilseed crop throughout many parts of the world. It is well adapted to long day photoperiods, however, it does not adapt well to short day subtropical regions. Short duration B. napus plants were resynthesized through ovary culture from interspecific crosses in which B. rapa cultivars were reciprocally crossed with B. oleracea. From five different combinations, 17 hybrid plants were obtained in both directions. By self-pollinating the F1 hybrids or introgressing them with cultivated B. napus, resynthesized (RS) F3 and semi-resynthesized (SRS) F2 generations were produced, respectively. In field trial in Bangladesh, the RS B. napus plants demonstrated variation in days to first flowering ranging from 29 to 73 days; some of which were similar to cultivated short duration B. napus, but not cultivated short duration B. rapa. The RS and SRS B. napus lines produced 2-4.6 and 1.6-3.7 times higher yields, respectively, as compared to cultivated short duration B. napus. Our developed RS lines may be useful for rapeseed breeding not only for subtropical regions, but also for areas such as Canada and Europe where spring rapeseed production can suffer from late spring frosts. Yield and earliness in RS lines are discussed. |
