Freezing tolerance and tuber production in selfed and backcross progenies derived from somatic hybrids between Solanum tuberosum L. and S. commersonii Dun. |
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Authors: | Y-K H Chen J P Palta J B Bamberg |
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Institution: | (1) Department of Horticulture, University of Wisconsin, Madison, WI 53706, USA Fax: +1 608 262 4743 E-mail: jppalta@facstaff.wisc.edu, US;(2) USDA/Agricultural Research Service, Inter-Regional Potato Introduction Station, 4312 Hwy 42, Sturgeon Bay, WI 54235, USA, US |
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Abstract: | Selfed and backcross progenies developed from tetraploid somatic hybrids between Solanum tuberosum (tbr) and S. commersonii (cmm) were characterized for nonacclimated freezing tolerance (NA) and acclimation capacity (ACC) (two independent genetic
components of freezing tolerance) under controlled environments. The segregation covered 28% and 71% of the parental range
for NA and ACC, respectively, with the distribution skewed toward the tbr parent. Therefore, ACC appeared to be relatively
easier to recover in the segregating generation. Some first backcross progeny had greater freezing tolerance than the cultivated
parent primarily through the increase in ACC. When grown in the field, the improved freezing tolerance observed in the selfed
progeny under controlled conditions was confirmed. Among NA, ACC, and freezing tolerance after acclimation (AA, which is the
cumulative performance of NA and ACC), AA exhibited the highest correlation coefficient with field frost tolerance. In addition
to freezing tolerance, vine maturity and tuber traits including tuber yield, tuber number per plant, mean tuber weight, and
specific gravity were also segregating. No significant correlation between undesirable tuber traits and freezing tolerance
was detected. Vine maturity and freezing tolerance were significantly correlated, so more careful selection for earliness
was necessary in incorporating freezing tolerance. Yield comparable or superior to the backcross parent Wis AG 231 and an
early Canadian cultivar, ‘Sable’, was found in many backcross progeny and some selfed progeny. The observed high yield can
be attributed to the increase in mean tuber weight as well as tuber number. Moreover, a high portion of progeny had a specific
gravity higher than 1.085, and some greater than 1.1. The implications derived from this study in breeding for freezing tolerance
and further use of these materials are discussed.
Received: 22 August 1998 / Accepted: 4 January 1999 |
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Keywords: | Potato Solanum tuberosum Freezing tolerance Cold acclimation Tuber traits |
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