Selection of potato clones for heat tolerance and resistance to potato viruses X and Y for processing purposes

Abstract

Potato (Solanum tuberosum L.) is one of the most important crops for human consumption worldwide, representing an essential component for the food security of several countries. However, yield and quality are negatively affected by biotic and abiotic stresses. In this sense, the selection of potato cultivars tolerant to heat and resistant to diseases is of great importance. Our goal was to select clones suitable for the chips industry, having heat tolerance and bearing the Rx1 and Ryadg alleles, which confer resistance to Potato virus X and Potato virus Y. We evaluated 491 clones originating from 31 biparental crosses under three different seasons in terms of heat stress (without heat stress [WHS], moderate heat stress [MHS], and high heat stress [HHS]). The evaluated traits were specific gravity (SG), dry matter yield (DMY), and proportion of physiological disorders (PD). After evaluation in the WHS and MHS seasons, the presence of the Rx1 and Ryadg alleles was investigated with the help of molecular markers in the 68 clones showing the best performance, which descended from the DGN2103 and DGN4002 parental clones. To gather the genotypic values for all traits in each season, the clones were ranked according to an index based on the genotype–ideotype distance. On average of all seasons, the top 10% selected clones by the index were 9 and 0.1% higher than the Atlantic cultivar for the traits DMY and SG, respectively, and 80% lower than Atlantic cultivar for PD. In conclusion, we report the selection of potato clones suitable for industrial processing.

Higher Temperatures Decrease Fruit Size in Strawberry Growing in the Subtropics

“…Fernandes Filho et al [37] used variations in seasonal temperatures to characterize the response of potato (Solanum tuberosum L.) to higher temperatures in Brazil. The plants were grown across three seasons from January to May 2017, May to September 2017, and November 2017 to February 2018, representing moderate heat stress, no heat stress, and severe heat stress.…”

Breeding for drought tolerance in perennial ryegrass (Lolium perenne L.) and tall fescue (Lolium arundinaceum [Schreb.] Darbysh.) by exploring genotype by environment by management interactions

“…Regarding the estimation of heritability for breeding populations grown under stresses, it has been reported that the greater the level of stress to which the plants are subjected, the lower the heritability estimates (Fernandes Filho et al, 2021; Hoffmann & Merila, 1999; Mwadzingeni et al, 2017). Hence, it poses a challenge in selecting drought‐resistant genotypes when they are subjected to long periods of drought.…”

Multitrait selection in seedless grape hybrids in semiarid regions of Brazil

“…Fernandes Filho et al. (2021), seeking potato clones suitable for industry, and Melo et al. (2020), aiming to select superior common bean progenies to mitigate the effects of genotype‐environment interactions, incorporated a restriction on the selection index for multiple traits based on the genotype‐ideotype distance.…”

“…Fernandes Filho et al. (2021) observed that the proportion of agreement between direct selection and the FAI‐BLUP index increased as the intensity of selection also increased, reaching between 59% and 73% when applying a selection intensity of 50%. These results demonstrate that the index was efficient in the selection of the best seedless table grape hybrids.…”