Physiological mechanisms contributing to the QTL qDTY3.2 effects on improved performance of rice Moroberekan x Swarna BC2 F3:4 lines under drought.
Journal Article (Journal Article)
Background
Traditional rice (Oryza sativa) varieties are valuable resources for the improvement of drought resistance. qDTY3.2 is a drought-yield quantitative trait locus that was identified in a population derived from the traditional variety Moroberekan and the drought-susceptible variety Swarna. In this study, our aim was to characterize the physiological mechanisms associated with qDTY3.2 . Our approach was to phenotype fifteen BC2 F3:4 lines for shoot and root drought resistance-related traits as compared to Swarna in the field under well-watered and drought stress conditions. Four BC2 F3:4 lines contrasting for yield under drought were selected for detailed characterization of shoot morphology, water use related traits, flowering time and root system architecture in the field as well as in controlled environments (lysimeters in a greenhouse, and gel imaging platform in a growth chamber).Results
Across five field experiments, grain yield correlated significantly with root growth along the soil profile, flowering time, and canopy temperature under drought conditions. The four selected BC2 F3:4 lines showed earlier flowering time, reduced distribution of root growth to shallow soil layers which resulted in lower water uptake (between 0 and 30 cm) and drought-induced increased distribution of root growth to deep soil layers (between 30 and 60 cm) as compared to Swarna in the field. Root system architecture phenotypes were confirmed in whole root systems in lysimeters, and corresponded to higher numbers of root tips in a gel imaging platform, highlighting the potential stability of some root traits across different growth stages and systems.Conclusions
We conclude that earlier flowering time, reduced shallow root growth, and drought-induced increased deep root growth are associated with the presence of qDTY3.2 since these phenotypes were consistently observed in the selected QTL lines with full introgression of qDTY3.2 . We hypothesize that the qDTY3.2 associated RSA phenotypes led to better use of water and metabolic resources which, combined with earlier flowering time, improved yield under drought.Full Text
Duke Authors
Cited Authors
- Grondin, A; Dixit, S; Torres, R; Venkateshwarlu, C; Rogers, E; Mitchell-Olds, T; Benfey, PN; Kumar, A; Henry, A
Published Date
- July 31, 2018
Published In
Volume / Issue
- 11 / 1
Start / End Page
- 43 -
PubMed ID
- 30066052
Pubmed Central ID
- PMC6068063
Electronic International Standard Serial Number (EISSN)
- 1939-8433
International Standard Serial Number (ISSN)
- 1939-8425
Digital Object Identifier (DOI)
- 10.1186/s12284-018-0234-1
Language
- eng