|GUEDES, MARCIO - Federal University Of Lavras|
|PINTO, CESAR - Federal University Of Lavras|
Submitted to: American Journal of Potato Research
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 2/1/2019
Publication Date: 4/15/2019
Citation: Guedes, M.L., Haynes, K.G., Vinyard, B.T., Pinto, C.A. 2019. Heat tolerance in diploid wild potato species. American Journal of Potato Research. 96:294-302. https://doi.org/10.1007/s12230-019-09716-9.
Interpretive Summary: Potatoes are a cool season crop and grow poorly under high temperature conditions. With rising global temperatures and the expansion of potato production into tropical and sub-tropical production areas, more heat tolerant cultivars are necessary. In this report, we screened ten wild potato species for heat tolerance and identified four species with good levels of heat tolerance. This new information will be of value to breeders for utilization of these four species in breeding heat tolerant cultivars.
Technical Abstract: Potatoes are a cool season crop. Yet, with growth in the world population and rising temperatures, more heat tolerant cultivars are going to be needed. The objective of this work was to identify heat tolerance in diploid wild Solanum species, as measured by the ability to form microtubers in tissue culture. In each of five experiments conducted over time, four nodal cuttings from up to 20 genotypes from each of ten diploid wild potato species were grown in MS medium supplemented with 8% sucrose and cultured at 19 °C (cool) and 25 °C (warm) in the dark. There were significant differences among species and the species x temperature interaction was significant for percent microtuberization and microtuber yield. Percent microtuberization in five of the species was similar under cool and warm temperatures; greater under cool temperatures for three species; and, greater under warm temperatures for two species. Microtuber yield in four of the species was similar under cool and warm temperatures; greater under cool temperatures for six species; and, greater under warm temperatures for one species. Solanum berthaultii, S. sogarandium, S. kurtzianum, and S. candolleanum were the most heat tolerant species evaluated. Resistance to heat stress is present in this wild species germplasm.