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Open AccessArticle

Near-Isogenic Lines of Japonica Rice Revealed New QTLs for Cold Tolerance at Booting Stage

by Zhenghai Sun 1,2,3,4,*,†, Juan Du 5,†, Xiaoying Pu 5,†, Muhammad Kazim Ali 5,6,7,†, Xiaomeng Yang 5, Chengli Duan 2,8, Meirong Ren 1, Xia Li 5 and Yawen Zeng 5,*
1
School of Horticulture and Gardening, Southwest Forestry University, Kunming 650224, China
2
College of Agronomy and Biotechnology, Yunnan Agricultural University, Kunming 650201, China
3
Yunnan Province South and Southeast Asia Joint R&D Center of Economic Forest Full Industry, Kunming 650224, China
4
Yunnan Province International Technological Cooperation Base of High Effective Economic Forestry Cultivation, Kunming 650224, China
5
Biotechnology and Germplasm Resources Institute, Yunnan Academy of Agricultural Sciences/Agricultural Biotechnology Key Laboratory of Yunnan Province, Kunming 650205, China
6
Department of Biotechnology, Federal Urdu University of Arts, Science and Technology, Karachi 75300, Pakistan
7
Karachi Institute of Biotechnology and Genetic Engineering (KIBGE), University of Karachi, Karachi 75270, Pakistan
8
School of Forestry and Biotechnology, Zhejiang Forestry University, Hangzhou 311300, China
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Agronomy 2019, 9(1), 40; https://doi.org/10.3390/agronomy9010040
Received: 29 November 2018 / Revised: 14 January 2019 / Accepted: 16 January 2019 / Published: 21 January 2019
Low temperature stress severely hampers rice productivity, and hence elaborating chilling-mediated physiochemical alterations and unravelling cold tolerance pathways will facilitate cold resilient rice breeding. Various cold tolerant Near-isogenic lines (NILs) selected at the booting stage through backcrossing of a japonica landrace Lijing2 (cold tolerant) with cold sensitive Towada (a japonica cultivar). The cold tolerance attributes of NILs was validated over two years by evaluating the spikelet fertility followed by correlation of nineteen morphological traits with the rate of seed setting (RSS). Results revealed BG, FG, 1-2IL, RSLL, and UIL were significantly correlated with RSS and had nearer marker interval distance with cold tolerance in QTL analysis. Two QTLs, qCTB-7-a and qCTB-7-b, were found for RSS based on a mixed linear model. Alleles of two QTLs were contributed by Lijing2 and genetic distances between the peaks were 0.00 and 0.06cM, which explained 5.70% and 8.36% variation, respectively, One QTL for 1-2IL, RSLL, and ILBS, while two QTLs for FG, BG, and UIL were also identified. These findings can be exploited to engineer low temperature stress tolerant rice in times of climate change. View Full-Text
Keywords: booting stage; rate of seed setting; cold tolerance; QTLs; NILs; rice booting stage; rate of seed setting; cold tolerance; QTLs; NILs; rice
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Sun, Z.; Du, J.; Pu, X.; Kazim Ali, M.; Yang, X.; Duan, C.; Ren, M.; Li, X.; Zeng, Y. Near-Isogenic Lines of Japonica Rice Revealed New QTLs for Cold Tolerance at Booting Stage. Agronomy 2019, 9, 40.

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