Preliminary Quantitative Trait Loci (QTL) Development for Improving Performance of Arkansas Rice Cultivars Under High Night Temperature Conditions.

High night temperature stress in rice greatly reduces yield by reducing spikelet fertility and other yield-related traits. In our study, we used 297 F2,4 recombinant inbred lines (RILs) from a Diamond x N22 population and genotyped them using 1016 SNPs from the IRRI RiCA panel (Arbelaez et al., 2019). We detected a significant quantitative trait loci (QTL) for percent-filled grains on chromosome 12 with 9.9% phenotypic variation explained (PVE) and two minor QTL on chromosome 6 (6.3% and 5.0% PVE). Additionally, two QTL were detected in chromosome 4 for the number of tillers (6.0% and 5.0% PVE). Significant QTL for other agronomic traits such as chlorophyll content, number of branches on panicles, days to harvest, stalk diameter, height, exertion of panicles, length of flag leaf, and presence of awns were detected in chromosomes 1, 2, 3, 4, 5 and 7. [ABSTRACT FROM AUTHOR]

Copyright of B.R. Wells Rice Research Studies - Arkansas Agricultural Experiment Station, University of Arkansas System is the property of University of Arkansas, Division of Agriculture and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)