Inheritance of freezing resistance in tuber-bearing Solanum species : Evidence for independent genetic control of nonacclimated freezing tolerance and cold acclimation capacity

摘要: Abstract Frost or winter survival is regarded as a complex trait with polygenic inheritance. Two major components of this in crop plants are freezing tolerance the nonacclimated state and cold acclimation capacity. To date researchers have not distinguished two separate heritable traits. The mode inheritance these traits was investigated F1 backcross populations wild diploid potato species (Solanum commersonii Solanum cardiophyllum) exhibiting extremes Precise assessment allowed distinction small but significant differences among genotypes. were correlated segregating populations, suggesting independent genetic control. Analyses generation means indicate that all variance for capacity proportion can be best explained by an additive-dominance model both being partially recessive. Recovery parental phenotypes limited suggests controlled relatively few genes. our knowledge first study demonstrating control main associated frost survival. Our results show it should possible to incorporate from germ plasm into cultivated selection. These help explain lack progress improving through field Furthermore, demonstrates relative simplicity acclimation, thus providing avenues understanding link between biochemical aspects low-temperature stress plants.