Production of interspecific hybrids in the genus Delphinium via ovule culture |
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| Authors: | Kazushige Honda Kiyoshi Tsutsui |
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| Institution: | (1) Department of Vegetable Crops, Agricultural Research Organization, Newe Ya'ar Research Center, P. O. Box 90000, Haifa, 31–900, Israel;(2) Department of Virology, Agricultural Research Organization, Volcani Center, P. O. Box 6, Bet Dagan, 50–250, Israel;(3) Department of Field and Vegetable Crops, Hebrew University of Jerusalem, Faculty of Agriculture, Rehovot, 76–100, Israel |
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| Abstract: | The melon (Cucumis melo) plant introduction PI 414723 was observed to segregate for resistance after inoculation with a highly
virulent non-aphid-transmissible strain of zucchini yellow mosaic potyvirus (ZYMV-NAT). By self-pollination of selected resistant
plants, the percentage of resistant plants increased in successive generations until nearly 100% in the S7 progeny. A reciprocal cross was made between a resistant S5 plant of PI 414723 and a plant of the susceptible cultivar Dulce. Parental-, filial-, and backcross- generation plants were
inoculated with ZYMV-NAT. One-half of the F1 plants, regardless of the direction of the cross, were resistant, indicating that the PI 414723 individual used for crossing
was heterozygous. The F2 generation obtained by self-pollination of resistant F1 plants segregated to resistant and susceptible in accordance with a 27:37 ratio, indicating that, in this cross, three complementary
dominant genes are needed for resistance to be expressed. The resistance to ZYMV carried by PI 414723 is oligogenic with the
number of genes observed to segregate in crossing depending on the genotype of the susceptible parent.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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| Keywords: | Cucumis melo disease resistance genetics melon zucchini yellow mosaic virus |
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