Crossability of Brassica tournefortii and B. rapa, and morphology and cytology of their F1 hybrids |
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Authors: | B R Choudhary P Joshi |
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Institution: | (1) Agricultural Research Station, Rajasthan Agricultural University, Mandor–Jodhpur 342 304, India e-mail: choudharybr@yahoo.com, IN;(2) SKN College of Agriculture, Rajasthan Agricultural University, Jobner 303 329, India, IN |
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Abstract: | The crossability between Brassica tournefortii (TT, 2n = 20) and Brassica rapa (AA, 2n = 20) and the cytomorphology of their F1 hybrids were studied. Hybrids between these two species were obtained only when B. tournefortii was involved as a female parent. The hybrid plants were intermediate for most of the morphological attributes and were found
to be free from white rust under field conditions. The F1 plants showed poor pollen fertility, although occasional seed set was achieved from open pollination. Self-pollination or
backcrosses did not yield any seeds in these plants. The occurrence of chromosome association ranging from bivalents (0–7),
trivalents (0–2) to a rare quadrivalent (0–1) in the dihaploid hybrids indicates pairing between the T and A genomes. The
homoeologous pairing coupled with seed set in the F1 plants offer an opportunity for interspecific gene transfers from B. tournefortii to B. rapa and vice-versa through interspecific hybridization.
Received: 3 July 2000 / Accepted: 22 September 2000 |
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Keywords: | Brassica tournefortii Brassica rapa Crossability Interspecific hybrid Morphology Cytology Homoeologous chromosome pairing |
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