Fine mapping of QTL for water use efficiency-related traits on chromosome 9 of Solanum habrochaites in the field

Crop Science

article

Amy M. Groh¹  Bryce A. Kubond¹  Dina A. St. Clair¹ 

[1] Plant Sciences Dep.

DOI  :  10.1002/csc2.20828

学科分类：农业科学（综合）

来源: Crop Science

【 摘 要 】

Fresh water is increasingly limited due to climate change. One way to reduce freshwater use by irrigated agriculture is to breed plants that can produce adequate yieldswith less water. A wild tomato, Solanum habrochaites, is more water stress tolerantthan cultivated tomato, S. lycopersicum L. Our study aimed to fine map quantitativetrait loci (QTL) for maturity, yield, and water use efficiency (WUE)-related traits(shoot dry weight and carbon isotope discrimination, ∆13C) on chromosome 9 in S.habrochaites using a set of 21 sub-near isogenic lines (sub-NILs). These sub-NILsand controls were evaluated in field experiments grown under full and reduced irrigation treatments across 2 yr. Genotype × environment interactions were significant, sothe data was separated into subsets of environments for further analyses. SignificantQTL were detected for 20 trait–environment combinations. All QTL were partiallyor completely coincident. The presence of the S. habrochaites allele at QTL wasassociated with later maturity, lower yields, and greater WUE. However, yield and∆13C exhibited no or low correlations with each other, suggesting these traits couldbe selected for improvement independently during breeding. Two of 21 sub-NILsshowed superior performance for WUE and yield compared to controls. These twogenotypes may prove useful in breeding programs to improve the WUE of tomatocultivars without negative effects on yield.

【 授权许可】

CC BY