Contrasting allelic effects for pistachio salinity tolerance in juvenile and mature trees

Abstract

Abstract Breeding perennial tree crops often requires prediction of mature performance from juvenile data. To assess the utility of juvenile screens to predict salinity tolerance of mature pistachio trees, we compared performance of three-month ungrafted seedlings and four-year-old grafted rootstocks under salinity stress. The QTL allele associated with higher salt exclusion from seedling leaves conferred lower growth in saline field conditions, cautioning that mapping QTL in seedlings may be easier than discerning the optimal allele for field performance.