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

Abstract

ABSTRACTtions suggests that both traits are controlled by relatively few genes. To our knowledge this is the first study demonstrating independent genetic control of the two main traits associated with frost or winter survival. Our results show that it should be possible to incorporate these traits from wild germ plasm into cultivated crop plants by independent selection. These results help explain the lack of progress in improving winter survival through field selection. Furthermore, our study demonstrates relative simplicity of the inheritance of cold acclimation, thus providing avenues for understanding the link between biochemical and genetic aspects of low-temperature stress in crop plants.

Water-Deficit Tolerance and Field Performance of Transgenic Alfalfa Overexpressing Superoxide Dismutase

“…Collectively, our data support the hypothesis that increased tolerance to several different environmental stresses can be achieved through increased tolerance of oxidative stress. Yet, it is somewhat surprising that this positive response occurs as the consequence of the overexpression of a single transgene, especially when both genetic and physiological studies have clearly shown that tolerance to freezing (Stone et al, 1993) and to drought (Estill et al, 1993) are quantitative genetic traits that are not easily manipulated by plant breeding (Fowler et al, 1983). The observed effects of the Mn-SOD transgene on alfalfa's tolerance to freezing and water deficit and its field performance might simply be due to the increased efficiency by which superoxide is removed from the cells of the transgenic plants d u r i n g periods of stress.…”

The Solanum commersonii Genome Sequence Provides Insights into Adaptation to Stress Conditions and Genome Evolution of Wild Potato Relatives

“…The molecular basis of nonacclimated tolerance in potato is poorly understood, although it has been reported that it may be genetically determined by loci independent of acclimated tolerance (Stone et al, 1993). We therefore analyzed the cold-responsive transcriptome of S. commersonii to shed further light on processes that might explain its freezing tolerance and cold acclimation capacity.…”

Plasma Membrane Lipids Associated with Genetic Variability in Freezing Tolerance and Cold Acclimation of Solanum Species

“…We have recently obtained evidence in support of this conclusion. In segregating Solanum populations we have found that NA freezing tolerance and acclimation capacity are controlled by separate sets of genes (Stone et al, 1992(Stone et al, , 1993.…”