Salinity tolerance in rice pdf

Pdf evaluation of salinity tolerance in rice genotypes. Rice plants were grown in waterlogged conditions, to represent this aspect of irrigated rice fields that should be included in salinity tolerance studies, as the effects of hypoxia on salinity. However, rice is very sensitive to salinity and is the most salt sensitive cereal crop with a threshold of 3 dsm. Effect of salinity on chlorophyll concentration, leaf area.

Physiological basis of salt stress tolerance in rice expressing. Challenges and opportunities thi my linh hoang 1, thach ngoc tran 2, thuy kieu tien nguyen 2, brett williams 1, penelope wurm 3, sean bellairs 3 and sagadevan mundree 1, 1 queensland university of technology qut centre for tropical crops and biocommodities, brisbane, qld 4001, australia. In other to increase crop yield and production in the face of increasing saline soils. The crop is however sensitive to salt stress, especially during the juvenile stages.

A rapid screening technique for salt tolerance in rice. Genetic variation for salinity tolerance in pakistani rice oryza sativa l. Susceptibility and tolerance of rice crop to salt threat plos. Pdf salinity and salt tolerance improvements in thai rice. Salinity tolerance in australian wild oryza species varies widely and matches that observed in o. Screening for salt tolerance in the field is difficult as soil salinity is dynamic. Salinity tolerance in rice varieties at different growth stages. New phenotyping technique for salinity tolerance at. Overexpressing a nam, ataf, and cuc nac transcription. Salinity tolerance in rice has been a target for im. While assigning salinity tolerance grade visual salt injury as well as percent growth rate retardation after 2 and 4 dis was taken into consideration. Developing rice varieties with good salt tolerance st and high yield is considered to be one of the most economic options to utilize salinized soil for rice production blumwald and grover 2006.

The genetic base of salttolerant rice donors being used in breeding is relatively narrow and needs broadening to breed varieties with wider adaptation to. The typical mechanism of salinity tolerance in rice is the na exclusion or uptake reduction, and increased absorption of k to maintain a good nak balance in the shoot. Rice plants generally tolerate salt by mainly two mechanisms, ion exclusion and osmotic tolerance munns and tester, 2008. Pdf advances in understanding salt tolerance in rice. Currently, recommended strategies to overcome the adverse effects of salt stress include the use of. However, mr211, mr232 and ir20 performed better based on dry matter. Niab 6, bg 4024, basmati 370, and ir 1561 with different salt tolerance were grown in yoshida nutrient solution without and with 100mol.

Salinity stress is one of the most severe constraints limiting rice production worldwide. While rice growing has contributed to the high water tables, the crop can also be used in the reclamation of saline soils, particularly if locally adapted salt tolerant. Molecular dissection of seedling salinity tolerance. Rice is a major stable in subsaharan africa, providing energy needed in diet. Salinity sensitivity of rice was studied to determine salinity effects on seedlings and yield components. Shaheen basmati was evolved as a salt tolerant fine rice variety by the soil salinity research institute, pindi bhattian, pakistan. Rice varieties mr211, ir20, br40 and mr232 showed greater salt tolerance during germination germinated at 12 ds m 1 salinity.

These mechanisms can also be further classified into ion exclusion, osmotic tolerance and tissue tolerance roy et al. Soil salinity is widespread in rice producing areas globally, restricting both vegetative growth and grain yield. Mechanisms of salinity tolerance in rice oryza sativa l. Advances in understanding salt tolerance in rice article pdf available in theoretical and applied genetics february 2019 with 852 reads how we measure reads. Mohammad rashed hossain a thesis submitted to the university of birmingham for the degree of doctor of philosophy. Identification of new qtl for salt tolerance from rice. Plants of twelve genotypes were grown in sand tanks in a. This study was designed to identify useful agronomic. Pollen viability, number of unfilled and filled grain and grain yield per plant were evaluated.

Salinity studies on rice grown in northern california, for example, resulted in a threshold. Pdf improvement of salinity stress tolerance in rice. Rice salinity tolerance is complex, both genetically and physiologically. Evaluation of salt tolerance in rice genotypes by multiple. A previously unknown zinc finger protein, dst, regulates. A previously unknown zinc finger protein, dst, regulates drought and salt tolerance in rice via stomatal aperture control xinyuan huang,1 daiyin chao,1 jiping gao, meizhen zhu, min shi, and hongxuan lin2 national key laboratory of plant molecular genetics, shanghai instituteof plant physiology and ecology, shanghai institutes for. Genetic analysis of salinity tolerance in rice oryza. Several qtl mapping studies for salinity tolerance have been reported.

Overexpressing a nam, ataf, and cuc nac transcription factor enhances drought resistance and salt tolerance in rice honghong hu, mingqiu dai, jialing yao, benze xiao, xianghua li, qifa zhang, and lizhong xiong national key laboratory of crop genetic improvement, national center of plant gene research wuhan and college of life science and technology. The genetic diversity available in cultivars provides a rich resource for discovering genes associated with salt tolerance which has not yet been sufficiently utilized. The mutant line sklobc15tb and cultivar bc15tb were found to be promising candidates for diversity analysis of salt tolerant rice. Despite many attempts using different strategies to improve salinity tolerance in rice. Pdf rice oryza sativa l is an important staple crop that feeds more than one half of the worlds population and is the model system for.

Genomewide association study of seedling stage salinity. Salinity effects on seedling growth and yield components. Increased salinization is progressively reducing rice productivity, escalating calls for research to ensure sustainable food production. Gregorio and others published screening rice for salinity tolerance, vol 22, irri discussion paper series find, read and cite all the research you need on researchgate. This study investigated the salinity tolerance of mutant rice by evaluating phenotype and genotype, using fortytwo simple sequence repeat ssr markers linked to the. For rice, soil salinity beyond ece 4 dsm is considered moderate salinity while more than 8 dsm becomes high. Overexpression of this gene in rice is associated with increased level of trehalose and proline along with upregulation of some of the stress inducible genes including wsi18, rab16c, hsp70 and elip. Salinity tolerance loci revealed in rice using high. Pdf mechanism of salt tolerance in rice nazir hussain. Selection of rice genotypes for salinity tolerance through. Generally, rice is considered to be moderately sensitive to salinity ismail and thomson 2011.

Pdf saltol qtl and their role in salinity tolerance in rice. The rice genotypes differed significantly for salt tolerance at seedling. Findings of this study are useful for developing new salinity tolerant rice. Salinity tolerance in australian wild oryza species varies. Findings of this study are useful for developing new salinity tolerant rice cultivars towards climate change. Khan et al, 1997, which is not significantly affected by ec even up to 16. Therefore, to downregulate dst, we selected the commercial but salt sensitive, early maturing.

Gregorio and others published screening rice for salinity tolerance find, read and cite all the research you need on researchgate. Thus, the development of salt tolerant rice promises to deal with increasing food demand due to climate change effects. Induction of salt tolerance in rice oryza sativa l. Rice genotypes were evaluated for salt tolerance in terms of grain yield and physiological characters. However, mr211, mr232 and ir20 performed better based on. Improvement of salinity stress tolerance in rice mdpi.

Evaluating rice for salinity using potculture provides a. Pdf screening rice for salinity tolerance, vol 22, irri. Hence, improvement of salt tolerance of rice should target the specific growth stages that are more sensitive to salinity stress and can substantially affect grain yield. New phenotyping technique for salinity tolerance at reproductive stage in rice. Engineering salinity tolerance in rice by exogenous expression of cell death regulators v list of publications and conferences thi my linh hoang, brett williams, harjeet khanna, james dale and sagadevan g. Breeding for salt tolerance is a major goal for rice breeders for which screens are required to select out tolerant lines for breeding.

Salinity tolerance in irrigated crops nsw department of. Assignment of salt tolerance grade based on genetic relatedness and early seedling stage salinity tolerance 11 rice genotypes were selected for salt tolerance grade assessment. So, in the current study, we tried to obtain the combination of stress tolerance as well as increase in yield by targeting a single gene, dst. International journal of molecular sciences article overexpression of rice expansin7 osexpa7 confers enhanced tolerance to salt stress in rice chuluuntsetseg jadamba 1, kiyoon kang 2, namchon paek 2, soo in lee 3, and soocheul yoo 1, 1 crop molecular breeding laboratory, department of plant life and environmental science, hankyong national university, jungangro, anseongsi, gyeonggido. The mechanism of salt tolerance takes place at three levels of organization.

This in turn leads to enhanced drought and salt tolerance in rice 20. Hairmansis et al 2014 used a nondestructive imagebased phenotyping protocol to assess salt tolerance traits of two rice varieties ir64 and fatmawati, and the response of rice to salinity 50, 75 and 100 mmoll nacl could be clearly distinguished from the control as indicated by the reduced increase of shoot area. Assessing salinity tolerance in rice mutants by phenotypic. An endophyte from saltadapted pokkali rice confers salt.

Water culture studies were conducted to investigate the physiological mechanism exercised by this variety in. Many factors influence a plants tolerance to salinity, including. Downregulation of the dst transcription factor using. Rice, genotypes, salinity, dwarf mutant, chlorophyll corresponding author, e mail. Different crops can tolerate different levels of salinity in irrigation water. Pdf hydroponic screening of rice seedlings for salinity. Exploring novel genetic sources of salinity tolerance in rice through.