Detection of Quantitative Trait Loci for White-back and Basal-white Kernels under High Temperature Stress in japonica Rice Varieties

High temperature has adverse effects on rice growth by inhibiting the flag leaf photosynthetic and antioxidant capacity, which can be alleviated by various exogenous chemicals such as spermidine (Spd). However, the role of Spd in conferring heat tolerance in rice is not well documented. Conventional japonica rice varieties Wuyunjing 24 and Ningjing 3 were treated with high temperatures at 37.5/27.0°C (day/night) and foliar sprayed with 1 mmol L−1 Spd after flowering. Results showed activities of superoxide dismutase (SOD) and peroxidase (POD) activities were deceased during high temperature treatment and eventually lead to the malondialdehyde (MDA) accumulation. Exogenous Spd significantly increased both SOD and POD activities at the later stage of high-temperature treatment, and reduced MDA accumulation were identified in both rice varieties. Application of Spd further increased the amount of soluble sugars during high temperature stress and that maintained the osmotic equilibrium of rice leaves. Spd significantly increased photosystem II (ΦPSII), photosynthetic electron transport rate (ETR), variable fluorescence/maximum fluorescence ratio (Fvʹ/Fmʹ), stomatal conductance and the photochemical reaction of light energy ratio (Pr), and ultimately improved the photosynthetic and transpiration rate during high temperature stress. In conclusion, exogenous Spd can effectively alleviate the adverse consequences of high temperature and could be further applied to provide strategies in mitigating the challenges of global warming-induced yield loss and other possible relevant issues.

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Identification of quantitative trait loci for seedling cold tolerance using RILs derived from a cross between japonica and tropical japonica rice cultivars

Euphytica ◽

10.1007/s10681-011-0575-y ◽

2011 ◽

Vol 184 (1) ◽

pp. 101-108 ◽

Cited By ~ 23

Author(s):

J. P. Suh ◽

C. K. Lee ◽

J. H. Lee ◽

J. J. Kim ◽

S. M. Kim ◽

...

Keyword(s):

Quantitative Trait Loci ◽

Cold Tolerance ◽

Quantitative Trait ◽

Japonica Rice ◽

Rice Cultivars ◽

Tropical Japonica ◽

Trait Loci ◽

Seedling Cold Tolerance

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Natural variations of SLG1 confer high-temperature tolerance in indica rice

Nature Communications ◽

10.1038/s41467-020-19320-9 ◽

2020 ◽

Vol 11 (1) ◽

Author(s):

Yufang Xu ◽

Li Zhang ◽

Shujun Ou ◽

Ruci Wang ◽

Yueming Wang ◽

...

Keyword(s):

High Temperature ◽

Temperature Stress ◽

Indica Rice ◽

High Temperature Stress ◽

Temperature Tolerance ◽

Cultivated Rice ◽

Rice Varieties ◽

Coding Regions ◽

High Temperature Tolerance ◽

Living Organisms

Abstract With global warming and climate change, breeding crop plants tolerant to high-temperature stress is of immense significance. tRNA 2-thiolation is a highly conserved form of tRNA modification among living organisms. Here, we report the identification of SLG1 (Slender Guy 1), which encodes the cytosolic tRNA 2-thiolation protein 2 (RCTU2) in rice. SLG1 plays a key role in the response of rice plants to high-temperature stress at both seedling and reproductive stages. Dysfunction of SLG1 results in plants with thermosensitive phenotype, while overexpression of SLG1 enhances the tolerance of plants to high temperature. SLG1 is differentiated between the two Asian cultivated rice subspecies, indica and japonica, and the variations at both promoter and coding regions lead to an increased level of thiolated tRNA and enhanced thermotolerance of indica rice varieties. Our results demonstrate that the allelic differentiation of SLG1 confers indica rice to high-temperature tolerance, and tRNA thiolation pathway might be a potential target in the next generation rice breeding for the warming globe.

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Detection of Quantitative Trait Loci for Stickiness and Appearance Based on Eating Quality Test in japonica Rice Cultivar

Breeding Research ◽

10.1270/jsbbr.8.39 ◽

2006 ◽

Vol 8 (2) ◽

pp. 39-47 ◽

Cited By ~ 17

Author(s):

Isao Tanaka ◽

Asako Kobayashi ◽

Katsura Tomita ◽

Yoshinobu Takeuchi ◽

Masumi Yamagishi ◽

...

Keyword(s):

Quantitative Trait Loci ◽

Quantitative Trait ◽

Rice Cultivar ◽

Eating Quality ◽

Japonica Rice ◽

Quality Test ◽

Trait Loci

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Identification of Quantitative Trait Loci for Alkaline Tolerance at Early Seedling Stage of Japonica Rice Under Alkaline Stress

Acta Agronomica Sinica ◽

10.1016/s1875-2780(08)60062-0 ◽

2009 ◽

Vol 35 (2) ◽

pp. 301-308

Author(s):

Dong-Ling QI ◽

Gui-Zhen GUO ◽

Myung-Chul LEE ◽

Chun-Gang YANG ◽

Jun-Guo ZHANG ◽

...

Keyword(s):

Quantitative Trait Loci ◽

Quantitative Trait ◽

Seedling Stage ◽

Alkaline Stress ◽

Japonica Rice ◽

Alkaline Tolerance ◽

Trait Loci ◽

Early Seedling

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

Genes ◽

10.3390/genes11010062 ◽

2020 ◽

Vol 11 (1) ◽

pp. 62

Author(s):

Niranjan Baisakh ◽

Jonalyn Yabes ◽

Andres Gutierrez ◽

Venkata Mangu ◽

Peiyong Ma ◽

...

Keyword(s):

Quantitative Trait Loci ◽

Grain Yield ◽

Drought Resistance ◽

Quantitative Trait ◽

Chromosome 1 ◽

Phenotypic Variance ◽

Yield Traits ◽

Rice Varieties ◽

Drought Tolerant ◽

Trait Loci

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.

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