Identification and mapping of a QTL (qDTY1.1) with a consistent effect on grain yield under drought

Ghimire, Krishna Hari; Quiatchon, L.; Vikram, Prashant; Swamy, B. P. Mallikarjuna; Dixit, Shalabh; Ahmed, Helaluddin; Hernandez, Jose E.; Borromeo, Teresita H.; Kumar, Arvind

doi:10.1016/j.fcr.2012.02.028

Cited by 122 publications

(114 citation statements)

References 35 publications

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“…In the N22/MTU1010 populations but non-stress situation, qDTY1.1 also showed a positive grain yield effect, suggesting consistency as a QTL for grain yield (Vikram et al, 2011). Similar additive effect on grain yield was observed in qDTY1.1 in Dhagaddheshi progenies from crosses with Swarna and IR64 varieties with 24.9% and 8.6% mean yields, respectively (Ghimire et al, 2012). Dhagaddheshi is a traditional drought-tolerance rice cultivar in India, while IR64 and Swarna are two popular highyielding varieties in Southeast and South Asia.…”

Section: Mapping Of Genetic Loci (Qtl) and Genome-wide Association Stsupporting

confidence: 59%

“…Approximately, 45 million hectares comprise rainfed areas (Haefele and Bouman, 2009) and about half is affected by drought (Serraj et al, 2011). For instance at reproductive stage, estimated moderate and severe yield reduction are about 45-60% and 65-91%, respectively as a result of drought stress (Ghimire et al, 2012, Sandhu et al, 2014, Vikram et al, 2011.…”

Section: Introductionmentioning

confidence: 99%

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When water runs dry and temperature heats up: Understanding the mechanisms in rice tolerance to drought and high temperature stress conditions

Rabara¹,

Msanne²,

Ferrer³

et al. 2018

Preprint

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Rice production, owing to its high-water requirement for cultivation, is very vulnerable to the threat of changing climate, particularly prolonged drought and high temperature. Such threats heighten the need for abiotic stress-resilient rice varieties with better yield potential. This review examines the physiological and molecular mechanisms of rice varieties to cope with stress conditions of drought (DS), high temperature (HTS) and their combination (DS-HTS). It appraises research studies in rice about its various phenotypic traits, genetic loci and response mechanisms to stress conditions to help craft new breeding strategies for rice varieties with improved resilience to abiotic stresses. This review consolidates available information on promising rice cultivars with desirable traits as well as advocates synergistic and complementary approaches in molecular and systems biology to develop new rice breeds that favorably respond to climate-induced abiotic stresses. The development of new breeding and cultivation strategies for climate-resilient rice varieties is a challenging task. It requires a comprehensive understanding of the various morphological, biochemical, physiological, and molecular components governing yield under drought and high temperature, but possible by implementing cohesive approaches involving molecular and systems biology approaches in genomics and molecular breeding, including genetic engineering.

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Section: Mapping Of Genetic Loci (Qtl) and Genome-wide Association Stsupporting

confidence: 59%

Section: Introductionmentioning

confidence: 99%

When water runs dry and temperature heats up: Understanding the mechanisms in rice tolerance to drought and high temperature stress conditions

Rabara¹,

Msanne²,

Ferrer³

et al. 2018

Preprint

View full text Add to dashboard Cite

show abstract

“…The establishment of grain yield as a selection criterion (Venuprasad et al , 2008; Kumar et al 2009Kumar et al , 2013Kumar et al , 2014Dixit et al 2014a), the identification of large-effect quantitative trait loci (QTLs) (Bernier et al 2007;Venuprasad et al 2009;Vikram et al 2011;Ghimire et al 2012;Swamy et al 2013;Palanog et al 2014;Sandhu et al 2014;Dixit et al 2014b, c), and understanding the molecular mechanism behind different QTLs through fine mapping and genetic studies (Dixit et al 2012a have provided new tools in developing high-yielding drought-tolerant varieties. Majority of these QTLs have explained a large proportion of the phenotypic variances for GY under drought and have shown consistency of effect.…”

Section: Introductionmentioning

confidence: 99%

Marker-assisted breeding to develop the drought-tolerant version of Sabitri, a popular variety from Nepal

et al. 2017

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Sabitri is a rice variety grown in a large part of the rainfed areas of Nepal. It was originally developed for irrigated condition; hence, this variety suffers high yield decline under drought. Two QTLs, qDTY 3.2 and qDTY 12.1 , with large effects on grain yield under drought were identified in the Sabitri background in separate QTL mapping studies. The present study reports the development of Sabitri near isogenic lines (NILs) with combinations of these two QTLs and their characterization under drought. To do so, marker-assisted backcross breeding (MABB) was combined with phenotypic selection to develop highyielding drought-tolerant NILs with Sabitri grain type. Apart from this, drought-tolerant variants for grain type with high yield under non-stress were identified among the developed NILs. Early days to flowering of up to 13 days and reduction in plant height of up to 13 cm as compared to Sabitri were observed in the developed NILs. Some of these NILs showed higher yield compared to Sabitri and relatively higher tolerance to drought, indicating the capture of positive alleles and interactions during the course of selection. The developed NILs possessed high yield potential which make them suitable materials for the testing of water-saving technologies in irrigated areas. Based on their performance, these NILs can be deployed in rainfed areas in Nepal and other countries of South Asia to increase yield stability.

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“…Nootripathu, Norungan and Kallurundaikar, traditionally grown under rainfed conditions in Tamil Nadu, India in subsistence farming systems. Rice landraces are a repertoire of genes of agronomic importance 17 , such as tolerance to submergence 58 , salinity 59 and drought 60 . STRUCTURE analysis grouped the 49 accessions into three subpopulations (Figure 2).…”

Section: Population Structurementioning

confidence: 99%

Genome-Wide Consistent Molecular Markers Associated with Phenology, Plant Production and Root Traits in Diverse Rice (Oryza sativa L.) Accessions under Drought in Rainfed Target Populations of the Environment

et al. 2018

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Drought is the most predominant constraint to rainfed rice production. Identifying molecular markers associated with drought resistance traits and deploying them in marker-assisted breeding will hasten the development of drought-resilient cultivars. A total of 49 diverse rice accessions, including traditional landraces, were evaluated for plant production and root traits under natural drought stress in rainfed target populations of environment (TPE) in six successive field trials from 2010 to 2015. Significant variation for phenology, plant production and root traits under drought was noticed among the accessions. Genotyping of the rice accessions using 599 polymorphic simple sequence repeat (SSR) markers showed considerable variation among them. STRUCTURE analysis grouped the 49 accessions into three subpopulations. Similarly, three clusters were observed in Neighbor joining tree created using Nei's genetic distance. The subpopulation POP1 consisted mostly of landraces, while subpopulation POP3 consisted of advanced breeding lines and POP2 accessions from all groups. Genome-wide association mapping detected 61 markers consistently associated in two or more trials with phenology, plant production and root traits under drought in TPE. The markers PSM52 (Chr 3), RM6909 (Chr 4), RM242 (Chr9) and RM444 (Chr 9) were consistently associated with grain yield and root traits under drought. The markers PSM127 (Chr 3) and PSM133 (Chr 4) were consistently associated with yield, plant height and spikelet fertility. These markers with pleiotropic and consistent associations with yield and secondary traits under drought in TPE may be robust candidates for marker-assisted breeding for drought resistance in rice.

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Identification and mapping of a QTL (qDTY1.1) with a consistent effect on grain yield under drought

Cited by 122 publications

References 35 publications

<strong>When water runs dry and temperature heats up: </strong><strong>Understanding the mechanisms in rice tolerance to drought and </strong><strong>high temperature stress conditions</strong>

<strong>When water runs dry and temperature heats up: </strong><strong>Understanding the mechanisms in rice tolerance to drought and </strong><strong>high temperature stress conditions</strong>

Marker-assisted breeding to develop the drought-tolerant version of Sabitri, a popular variety from Nepal

Genome-Wide Consistent Molecular Markers Associated with Phenology, Plant Production and Root Traits in Diverse Rice (<i>Oryza sativa</i> L.) Accessions under Drought in Rainfed Target Populations of the Environment

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