|Zhao, Haijun - US Department Of Agriculture (USDA)|
Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: 12/13/2016
Publication Date: 2/21/2017
Citation: Rohila, J.S., Edwards, J., Zhao, H., McClung, A.M. 2017. Agronomic and physiological performance of Teqing x Lemont introgression rice (Oryza sativa L.) lines under limited irrigation system. Meeting Abstract. Proc.InterDrought-V Abstracts. p. 142.
Technical Abstract: Rice is a staple food for almost half of the world. Most rice in the world, including the USA, is produced under a flooded paddy system that makes rice one of the most irrigated grain crops on earth. With many water resources being depleted due to high irrigation demands, it has become essential to develop rice varieties and management systems that can produce high yields and grain quality with less water. Production of rice under the alternate-wetting-and-drying (AWD) system is one such choice. Research was initiated using a set of 117 introgression lines (TILs) derived from the varieties Teqing and Lemont to identify genomic and trait (agronomic and physiological) relationships that are important for rice production using AWD. The TILs were previously genotyped using 178 Simple Sequence Repeat (SSR) markers resulting in one marker every 0.5cM, on average. Following a two year field trial evaluating the TILs under flood and AWD management, 14 high yielding TILs were selected for a greenhouse study using flood and AWD. Statistical analyses of growth and yield components indicated significant differences for several agronomic traits among individual TILs. Interestingly, when compared between the flooded and AWD systems, several TILs had increased photosynthesis, tiller number, and biomass but none had greater yield than Lemont. This suggests the complexity of physiological responses to water stress and the need for further recombination of selected TILs to produce high yield under AWD.