Assessment of adaptability of recently released salt tolerant rice varieties in coastal regions of South Bangladesh

Islam, Mohammad Rafiqul; Sarker, M. Ruhul Amin; Sharma, Naina; Rahman, Md. Mosaddequr; Collard, B. C. Y.; Gregorio, Glenn B.

doi:10.1016/j.fcr.2015.09.012

Cited by 46 publications

(28 citation statements)

References 16 publications

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“…These genotypes were superior among all others with higher mean yields and stability; thus, they could be nominated for the formal release process and commercialization. A number of studies, although not exactly on GGE, looked for stable rice genotypes across salt stress locations and nominated the most stable and highest-yielding genotypes in the national varietal testing process for release 34 , 44 , 48 , 52 .…”

Section: Discussionmentioning

confidence: 99%

Identification of mega-environments and rice genotypes for general and specific adaptation to saline and alkaline stresses in India

Krishnamurthy

Sharma

et al. 2017

Sci Rep

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In the present study, a total of 53 promising salt-tolerant genotypes were tested across 18 salt-affected diverse locations for three years. An attempt was made to identify ideal test locations and mega-environments using GGE biplot analysis. The CSSRI sodic environment was the most discriminating location in individual years as well as over the years and could be used to screen out unstable and salt-sensitive genotypes. Genotypes CSR36, CSR-2K-219, and CSR-2K-262 were found ideal across years. Overall, Genotypes CSR-2K-219, CSR-2K-262, and CSR-2K-242 were found superior and stable among all genotypes with higher mean yields. Different sets of genotypes emerged as winners in saline soils but not in sodic soils; however, Genotype CSR-2K-262 was the only genotype that was best under both saline and alkaline environments over the years. The lack of repeatable associations among locations and repeatable mega-environment groupings indicated the complexity of soil salinity. Hence, a multi-location and multi-year evaluation is indispensable for evaluating the test sites as well as identifying genotypes with consistently specific and wider adaptation to particular agro-climatic zones. The genotypes identified in the present study could be used for commercial cultivation across edaphically challenged areas for sustainable production.

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Section: Discussionmentioning

confidence: 99%

Identification of mega-environments and rice genotypes for general and specific adaptation to saline and alkaline stresses in India

Krishnamurthy

Sharma

et al. 2017

Sci Rep

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“…Although salt tolerance is complex and developmentally regulated in rice, reasonable progress has been made recently in developing salt-tolerant varieties through conventional breeding methods. This success results from several factors, including the availability of tolerant landraces as donors, phenotyping protocols that allow the evaluation of large populations in a relatively short time, progress in understanding the genetics and physiology of tolerance, and the approaches used for systematic evaluation and selection of elite breeding lines in naturally salt-affected fields with the participation of farmers (54,66,67). Several salt-tolerant Marker-assisted breeding: the use of molecular markers to reconstitute the desired genetic makeup of a variety while introducing one or more important traits during variety development in order to improve the efficiency of selection rice varieties were recently released and commercialized in several countries in Asia, including Bangladesh, India, and the Philippines ( Table 1).…”

Section: Progress In Developing Salt-tolerant Ricementioning

confidence: 99%

“…Several salt-tolerant Marker-assisted breeding: the use of molecular markers to reconstitute the desired genetic makeup of a variety while introducing one or more important traits during variety development in order to improve the efficiency of selection rice varieties were recently released and commercialized in several countries in Asia, including Bangladesh, India, and the Philippines ( Table 1). These varieties have benefited rice production in salt-affected areas (Figure 2) through increased grain yield (by 0.5 to more than 2 tons per hectare in farmers' fields) (67,131), stable production, and the ability to bring new and previously abandoned lands into production (67). However, the development of these varieties spanned 10-15 years of rigorous evaluation of many breeding lines, incurring high costs in the process, which makes alternative approaches (such as marker-assisted breeding and other genome-based methods) more attractive (142,143).…”

Section: Progress In Developing Salt-tolerant Ricementioning

confidence: 99%

Genomics, Physiology, and Molecular Breeding Approaches for Improving Salt Tolerance

Ismail

Horie

2017

Annu. Rev. Plant Biol.

406

315

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Salt stress reduces land and water productivity and contributes to poverty and food insecurity. Increased salinization caused by human practices and climate change is progressively reducing agriculture productivity despite escalating calls for more food. Plant responses to salt stress are well understood, involving numerous critical processes that are each controlled by multiple genes. Knowledge of the critical mechanisms controlling salt uptake and exclusion from functioning tissues, signaling of salt stress, and the arsenal of protective metabolites is advancing. However, little progress has been made in developing salt-tolerant varieties of crop species using standard (but slow) breeding approaches. The genetic diversity available within cultivated crops and their wild relatives provides rich sources for trait and gene discovery that has yet to be sufficiently utilized. Transforming this knowledge into modern approaches using genomics and molecular tools for precision breeding will accelerate the development of tolerant cultivars and help sustain food production.

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“…The productivity of rice is not satisfactory in the coastal areas due to aberrant climatic conditionsand non-availability of hybrid varieties [6]. Water stagnation (medium-deep, 25-50 cm) for most of the crop growing season, flash floods (complete submergence for 1-2 weeks), and water and soil salinity [7] are typical deterrents to high productivity. The South 24-Parganas district ranks 12th amongst all rice growing districts of West Bengal in rice productivity [8].…”

Section: Introductionmentioning

confidence: 99%

Optimizing Potassium Application for Hybrid Rice (Oryza sativa L.) in Coastal Saline Soils of West Bengal, India

Banerjee

Ray

Dutta³

et al. 2018

Agronomy

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The present study assesses the response of hybrid rice (variety Arize 6444) to potassium (K) application during rainy (wet) seasons of 2016 and 2017 in coastal saline soils of West Bengal, India. The study was conducted at the Regional Research Farm, Bidhan Chandra Krishi Viswavidyalaya, Kakdwip, West Bengal. The soil is clayeywith acidic pH (5.91), saline (Electrical conductivity/EC 1.53 dS m−1) and of high K fertility (366 kg ha−1). The experimental plots were laid out in a randomized complete block design with five (5) K treatments (0, 30, 60, 90, and 120 kg K2O ha−1) with four replications. Plant height, dry matter (DM) in different plant parts, number of tillers, and grain yield were measured in each treatment for the determination of optimum K dose. The study revealed that the stem, leaf, and grain dry matter production at 60 days after transplanting (DAT) and harvest were significantly (p ≤ 0.05) higher at 90 kg K2O ha−1 application. The number of tillers hill−1 was also higher (p ≤ 0.05) in plants fertilized with 90 kg K2O ha−1 over K omission. At harvest, grain K concentration improved (p ≤ 0.05) with K fertilization at 90 kg K2O ha−1, 116% more than the zero-K. Omission of K application from the best treatment (90 kg K2O ha−1) reduced grain yield by 3.5 t ha−1 even though the available K content was high. Potassium uptake restriction due to higher Mg content in the soil may have caused reduced uptake of K leading to yield losses. The present study also showed higher profits with 90 kg K2O ha−1 with higher net returns (US$ 452 ha−1) and benefit:cost ratio (1.75) over other treatments from hybrid rice (var. Arize 6444). From the regression equation, the economic optimum level of K (Kopt) was derived as 101.5 kg K2O ha−1 that could improve productivity of hybrid rice during the wet season in coastal saline soils of West Bengal.

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Assessment of adaptability of recently released salt tolerant rice varieties in coastal regions of South Bangladesh

Cited by 46 publications

References 16 publications

Identification of mega-environments and rice genotypes for general and specific adaptation to saline and alkaline stresses in India

Identification of mega-environments and rice genotypes for general and specific adaptation to saline and alkaline stresses in India

Genomics, Physiology, and Molecular Breeding Approaches for Improving Salt Tolerance

Optimizing Potassium Application for Hybrid Rice (Oryza sativa L.) in Coastal Saline Soils of West Bengal, India

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