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Title: DEVELOPING BACTERIAL WILT RESISTANT BREEDING LINES FROM SOLANUM TUBEROSUM/ S.COMMERSONII SOMATIC HYBRIDS

Author
item LAFERRIER, LOUISE - UNIVERSITY OF WISCONSIN
item ALLEN, C - UNIVERSITY OF WISCONSIN
item Helgeson, John

Submitted to: Potato Association of America Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 7/27/1998
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Bacterial wilt, caused by Ralstonia solanacearum (formerly Pseudomonas solanacearum) is an important potato disease in the tropics and sub-tropics and has emerged as a serious problem in temperate Netherlands. A wild relative of potato, S. commersonii, is reportedly wilt-resistant, but is sexually incompatible with S. tuberosum. Protoplasts from the two species were fused to produce vigorous, fertile somatic hybrids. We tested the S. commersonii and S. tuberosum source material, cv. Atlantic, six somatic hybrid lines, backcross 1 (BC1) parent A89804-7, and 23 BC1 lines with a virulent strain of R. solanacearum (race 3, biovar 2). As expected, S. commersonii was significantly more wilt resistant than the cultivated potatoes. Five of the six somatic hybrid lines expressed resistance levels similar that of S. commersonii. The resistance level of the sixth somatic hybrid was intermediate, significantly different from both S. commersonii and S. tuberosum. There was segregation of wilt resistance in BC1 lines. Some lines are very susceptible, other lines have resistance levels not statistically different from that of the resistant S. commersonii line. These results indicate that wilt resistance is stable both through somatic hybridization and through meiosis.