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Open AccessArticle

Genetic Mapping Identifies Consistent Quantitative Trait Loci for Yield Traits of Rice under Greenhouse Drought Conditions

1
School of Plant, Environmental and Soil Sciences, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, USA
2
Rice Research Station, Louisiana State University Agricultural Center, Crowley, LA 70578, USA
3
Department of Crop and Soil Sciences, University of Arkansas, Fayetteville, AR 72701, USA
*
Author to whom correspondence should be addressed.
They contributed equally to this work.
Present address: Jiangsu Academy of Agricultural Sciences, Nanjing 210014, Jiangsu, China.
§
Present address: Plastomics Inc., St. Louis, MO 63132, USA.
Genes 2020, 11(1), 62; https://doi.org/10.3390/genes11010062
Received: 21 December 2019 / Revised: 31 December 2019 / Accepted: 3 January 2020 / Published: 5 January 2020
(This article belongs to the Section Plant Genetics and Genomics)
Improving drought resistance in crops is imperative under the prevailing erratic rainfall patterns. Drought affects the growth and yield of most modern rice varieties. Recent breeding efforts aim to incorporate drought resistance traits in rice varieties that can be suitable under alternative irrigation schemes, such as in a (semi)aerobic system, as row (furrow-irrigated) rice. The identification of quantitative trait loci (QTLs) controlling grain yield, the most important trait with high selection efficiency, can lead to the identification of markers to facilitate marker-assisted breeding of drought-resistant rice. Here, we report grain yield QTLs under greenhouse drought using an F2:3 population derived from Cocodrie (drought sensitive) × Nagina 22 (N22) (drought tolerant). Eight QTLs were identified for yield traits under drought. Grain yield QTL under drought on chromosome 1 (phenotypic variance explained (PVE) = 11.15%) co-localized with the only QTL for panicle number (PVE = 37.7%). The drought-tolerant parent N22 contributed the favorable alleles for all QTLs except qGN3.2 and qGN5.1 for grain number per panicle. Stress-responsive transcription factors, such as ethylene response factor, WD40 domain protein, zinc finger protein, and genes involved in lipid/sugar metabolism were linked to the QTLs, suggesting their possible role in drought tolerance mechanism of N22 in the background of Cocodrie, contributing to higher yield under drought. View Full-Text
Keywords: drought; grain yield; greenhouse; panicle; QTL; rice drought; grain yield; greenhouse; panicle; QTL; rice
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Baisakh, N.; Yabes, J.; Gutierrez, A.; Mangu, V.; Ma, P.; Famoso, A.; Pereira, A. Genetic Mapping Identifies Consistent Quantitative Trait Loci for Yield Traits of Rice under Greenhouse Drought Conditions. Genes 2020, 11, 62.

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