Agronomy and Horticulture, Department of
Document Type
Article
Date of this Version
5-10-2024
Citation
Plant Physiology, 2024, 196, 164–180. https://doi.org/10.1093/plphys/kiae313
Abstract
Global nighttime temperatures are rising at twice the rate of daytime temperatures and pose a challenge for rice (Oryza sativa) production. High nighttime temperature (HNT) stress affects rice yield by reducing grain weight, size, and fertility. Although the genes associated with these yield parameters have been identified and characterized under normal temperatures, the genetic basis of grain weight regulation under HNT stress remains less explored. We examined the natural variation for rice single grain weight (SGW) under HNT stress imposed during grain development. A genome-wide association analysis identified several loci associated with grain weight under HNT stress. A locus, SGW1, specific to HNT conditions resolved to LONELY GUY-Like 1 (LOGL1), which encodes a putative cytokinin-activation enzyme. We demonstrated that LOGL1 contributes to allelic variation at SGW1. Accessions with lower LOGL1 transcript abundance had higher grain weight under HNT. This was supported by the higher grain weight of logl1-mutants relative to the wild type under HNT. Compared to logl1-mutants, LOGL1 over-expressers showed increased sensitivity to HNT. We showed that LOGL1 regulates the thiamin biosynthesis pathway, which is under circadian regulation, which in turn is likely perturbed by HNT stress. These findings provide a genetic source to enhance rice adaptation to warming night temperatures and improve our mechanistic understanding of HNT stress tolerance pathways.
Walia PP 2024 Natural variation SUPPL2.xlsx (20 kB)
Walia PP 2024 Natural variation SUPPL3.xlsx (12 kB)
Walia PP 2024 Natural variation SUPPL4.xlsx (37 kB)
Walia PP 2024 Natural variation SUPPL5.xlsx (10 kB)
Walia PP 2024 Natural variation SUPPL6.xlsx (19 kB)
Walia PP 2024 Natural variation SUPPL7.xlsx (12 kB)
Walia PP 2024 Natural variation SUPPL8.xlsx (19 kB)
Walia PP 2024 Natural variation SUPPL9.xlsx (17 kB)
Walia PP 2024 Natural variation SUPPL10.xlsx (28 kB)
Walia PP 2024 Natural variation SUPPL11.xlsx (11 kB)
Included in
Agricultural Science Commons, Agriculture Commons, Agronomy and Crop Sciences Commons, Botany Commons, Horticulture Commons, Other Plant Sciences Commons, Plant Biology Commons
Comments
Open access.