Multitrait differential response in a diverse potato panel under contrasting water regimes

Abstract

Water stress is the most significant environmental stress in agriculture worldwide.Potato (Solanum tuberosum L.) is a drought-susceptible crop. Water stress tolerance is a complex trait of increasing importance in potato. The objective of this work was to evaluate the differential response strategies associated with water stress tolerance in a highly diverse potato panel. Multienvironment trials were assessed, both in field and in glasshouse with contrasting water regimes. The yield, dry matter, and frying ability were measured in the field assays, whereas proline concentration (PrC), relative water content (RWC), and water consumption (WC) were measured in the glasshouse assays. A mixed linear model and ANOVA were performed. The best linear unbiased predictors (BLUPs) of every genotype for each measured variable were estimated.Pearson correlation coefficient (r) and principal component analysis (PCA) assessed the association among traits. The genotypes were ranked by their BLUPs values. The high diversity potato panel showed variability both in the response to water stress and within each water regime. In general, Solanum tuberosum spp. andigena genotypes were associated with the lowest PrC and higher yield, WC, and RWC. By using BLUPs, a panel of genotypes with good performance under water deficit was defined. This paper provides knowledge useful to design breeding strategies to water stress tolerance and new physiological research lines. The utilization of the elite genotypes identified in this study as progenitors constitute a starting point for breeding programs oriented to develop water-stress-tolerant varieties.

Genome‐wide association analysis of agronomical and physiological traits linked to drought tolerance in a diverse potatoes (Solanum tuberosum) panel

“…‘Asterix’, ‘Bintje’, ‘Frital INTA’, ‘Innovator’, ‘Kennebec’, ‘Newen INTA’, ‘Pampeana INTA’ and ‘Spunta’ (Cotes Torres & Nustez Lopez, 2001). Virus‐free seed tuber pieces (five seeds per metre) were planted as an experimental unit at a row spacing of 0.85 m (Tagliotti et al., 2020). In order to minimise biotic stresses, fungicide and insecticide sprays (Infinito ® [Fluopicolide 6.25% + Propamocarb hydrochloride 62.5%], Bayer CropScience S.A; Poliram DF ® [Metiram 70%], BASF Chemistry S.A) were applied according to suppliers recommendations.…”

Heritable Variation, Genetic and Phenotypic Correlations for Tuber Traits and Host Plant Resistance to Late Blight for Potato Breeding in Scandinavian Testing Sites

“…Likewise, the BLUPs adjust means values by correcting for the genotype × environment interaction when using multi-environment trial data. The use of the BLUPs led to the identification of a set of potato breeding clones performing well under a water deficit [9].…”