Exploring novel genetic sources of salinity tolerance in rice through molecular and physiological characterization

Rahman, Md. Mosaddequr; Thomson, Michael J.; Shah-E-Alam, Md.; Ocampo, Marjorie de; Egdane, James; Ismail, Abdelbagi M.

doi:10.1093/aob/mcw030

Cited by 109 publications

(91 citation statements)

References 82 publications

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“…The rice plant is morphologically diverse, especially in terms of the vegetative traits such as plant height and leaf length. Our previous studies involving local aromatic and nonaromatic rice germplasm from Bangladesh using morphological, physicochemical, and molecular markers revealed high genetic diversity [6, 24–28]. However, such investigations on aromatic and fine rice genotypes are not yet to be conducted.…”

Section: Introductionmentioning

confidence: 99%

Variability Assessment of Aromatic and Fine Rice Germplasm in Bangladesh Based on Quantitative Traits

Islam

Khalequzzaman

Bashar³

et al. 2016

The Scientific World Journal

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The study was conducted to investigate genetic variability among 113 aromatic and fine local rice genotypes of which five were exotic in origin. The test genotypes were evaluated for 19 growth traits, yield components, and yield. All the quantitative traits varied significantly among the test genotypes. High heritability along with high genetic advance was observed for flag leaf area, secondary branches per panicle, filled grains per panicle, grain length, grain breadth, grain length breadth ratio, and 1000 grain weight. Such findings suggested preponderance of additive gene action in gene expression for these characters. Grain yield was significantly and positively correlated with days to flowering, days to maturity, panicle length, filled grains per panicle, and 1000 grain weight. According to D 2 cluster analysis, 113 test genotypes formed 10 clusters. Selection of parents from the clusters V and X followed by hybridization would possibly result in desirable heterosis for the development of heterotic rice hybrids. Finally, molecular characterizations of the studied germplasm are required for high resolution QTL mapping and validating the presence of candidate genes responsible for valuable characters.

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Section: Introductionmentioning

confidence: 99%

Variability Assessment of Aromatic and Fine Rice Germplasm in Bangladesh Based on Quantitative Traits

Islam

Khalequzzaman

Bashar³

et al. 2016

The Scientific World Journal

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“…coastal salinity, and may have evolved with 1-2 of the above defense mechanisms against salinity stress (Lisa et al 2004 andRahman et al 2016). The physiological responses of plants towards salinity and their relation to salinity resistance have been much studied and frequently reviewed for many crop species, including rice, wheat, bean, tomato, onion, pepper, corn, potato etc.…”

Section: Plants Response Towards Saline Conditionmentioning

confidence: 99%

Transgenic Crops Targeting Ion Homeostasis Machinery: Bangladesh Perspective for Adaptation to Climate Change to Ensure Food Security

Datta

Chowdhury

Islam

2017

Plant Tissue Cult. & Biotech.

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Salinity stress is one of the major adversarial impacts of climate change that limits crop productivity worldwide, especially in developing countries. To overcome this situation it is necessary to understand the cellular basis of salt stress tolerance mechanisms. Various genes involved in ion exclusion, osmotic tolerance, Reactive Oxygen Species (ROS) scavenging and other regulation mechanisms influence salinity tolerance in crops. Function of these candidate genes/sequences may vary in different plants and within different tissues. For the last two decades, in Bangladesh several approaches have been taken to develop transgenic rice, the staple crop. Work is in progress to monitor stable incorporation of these transgenes. Further evaluation is needed to check their adaptation/resistance in natural environments. Good performance in field conditions will lead to acceptance of these varieties for commercial productions in order to ensure food security.

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“…Huang et al, 2003) and/or germination and early growth when seeded in a flooded soil (Ismail et al, 2009) and in salinity resistance (e.g. Yeo and Flowers, 1983;Rahman et al, 2016).…”

Section: Plant Growthmentioning

confidence: 99%

Energetics of acclimation to NaCl by submerged, anoxic rice seedlings

Kurniasih¹,

Greenway²,

Colmer

2016

Ann Bot

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Background and aims Our aim was to elucidate how plant tissues under a severe energy crisis cope with imposition of high NaCl, which greatly increases ion fluxes and hence energy demands. The energy requirements for ion regulation during combined salinity and anoxia were assessed to gain insights into ion transport processes in the anoxia-tolerant coleoptile of rice.Methods We studied the combined effects of anoxia plus 50 or 100 mM NaCl on tissue ions and growth of submerged rice (Oryza sativa) seedlings. Excised coleoptiles allowed measurements in aerated or anoxic conditions of ion net fluxes and O 2 consumption or ethanol formation and by inference energy production.Key Results Over 80 h of anoxia, coleoptiles of submerged intact seedlings grew at 100 mM NaCl, but excised coleoptiles, with 50 mM exogenous glucose, survived only at 50 mM NaCl, possibly due to lower energy production with glucose than for intact coleoptiles with sucrose as substrate. Rates of net uptake of Na þ and Cl À by coleoptiles in anoxia were about half those in aerated solution. Ethanol formation in anoxia and O 2 uptake in aerobic solution were each increased by 13-15 % at 50 mM NaCl, i.e. ATP formation was stimulated. For acclimation to 50 mM NaCl, the anoxic tissues used only 25 % of the energy that was expended by aerobic tissues. Following return of coleoptiles to aerated non-saline solution, rates of net K þ uptake recovered to those in continuously aerated solution, demonstrating there was little injury during anoxia with 50 mM NaCl.Conclusion Rice seedlings survive anoxia, without the coleoptile incurring significant injury, even with the additional energy demands imposed by NaCl (100 mM when intact, 50 mM when excised). Energy savings were achieved in saline anoxia by less coleoptile growth, reduced ion fluxes as compared to aerobic coleoptiles and apparent energy-economic ion transport systems.

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Exploring novel genetic sources of salinity tolerance in rice through molecular and physiological characterization

Cited by 109 publications

References 82 publications

Variability Assessment of Aromatic and Fine Rice Germplasm in Bangladesh Based on Quantitative Traits

Variability Assessment of Aromatic and Fine Rice Germplasm in Bangladesh Based on Quantitative Traits

Transgenic Crops Targeting Ion Homeostasis Machinery: Bangladesh Perspective for Adaptation to Climate Change to Ensure Food Security

Energetics of acclimation to NaCl by submerged, anoxic rice seedlings

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