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Resistance to tomato spotted wilt virus (tswv) in nicotiana Alata and N. Sanderae and in hybrids between N-Tabacum and N-Alata



Resistance to tomato spotted wilt virus (tswv) in nicotiana Alata and N. Sanderae and in hybrids between N-Tabacum and N-Alata



Plant Breeding and Seed Science 54: 91-100



Seven populations of N. alata, 4 populations of N. sanderae and several hundred plants belonging to three generations of the hybrid (N. tabacum ev. TB-566 tetra x N. alata) x N. alata were tested for resistance to TSWV. Tested plants were artificial inoculated with TSWV under greenhouse conditions. Out of I I accessions off. alata and N. sanderae 7 were found to be composed entirely of plants hypersensitive to TSWV. In the remaining four accessions there were from 16 to 25% of TSWV susceptible plants. The hybrids (N. tabacum cv. TB-566 tetra x N. alata) x N. alata, regardless of their cytogenetical status, showed hypersensitive response to inoculation with TSWV. The local necrotic lesions that developed upon inoculation were identical to those observed in TSWV-in-oculated plants of N. alata. Bioassay involving the susceptible species N. glutinosa dctected no virus in the tissues of either hypersensitive or symptomless plants. Hypersensitive response to TSWV was faithfully expressed in the hybrids (A tabacum cv. TB-566 tetra x N. alata) x N. alata, and unlike heretofore obtained resistance (cv. Polalta) did not seem to be associated with morphological abnormalities. It may have a potential as a source of resistance in commercial tobacco cultivars.

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