ISHS Acta Horticulturae 403: International Symposium on Cultivar Improvement of Horticultural Crops. Part 2: Fruit Crops
A CYTOLOGICAL STUDY ON DISTANT HYBRIDS OF RIBES NIGRUM L. AND R.GROSSULARIAFR. |
| Authors: | D. Xiaodong, S. Wei, L. Guangyu |
| Keywords: | blackcurrant, gooseberry, distant hybrids, meiosis, pollen, sterility |
| Abstract:
Blackcurant and gooseberry are in Subgen. Ribes and Subgen. Grossularia respectively, they are two kinds of important fruits in cold area, there is no doubt that distant hybrids are usually sterile. In this paper, we have conducted a cytological study on distant hybrids of R. nigrum and R. grossularia the results showed that all cultivars of R. nigrum and R. grossularia were diploid (2n=16), and the distant hybrids were all tetraploid (2n=32), the synapses among chromosomes in pollen mother cells of distant was also very untight on equatorial plane of cell during metaphaes I. During anaphase I, we found many chromosome bridges and lost chromosome fragments, the size of matured pollens were very uneven, their surfaces were wrinkly, the apertures subsided into pollens, the average germinating rate was 9.8%, the fruit setting rale was 1.4%, both of them were significantly less than those of cultivars. In view of these, we think that the distant relation of their parents is the main reason that hybrids are sterile. | |
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