Chinese scientists will expand planting of a salttolerant hybrid rice breed this year as the worlds mostpopulous country seeks to use more of its poorquality arable land and increase self. Evaluating rice for salinity using potculture provides a. The tolerance to salt stress was compromised in introgression line rz35 relative to its rice parental line matsumae. It is a traditional, tall, susceptible to lodging, photoperiodsensitive rice variety with low tillering and long.
Newly identified wild rice accessions conferring high salt. The saturation of snp markers in our linkage map increased the resolution of qtl mapping. Salt tolerant rice variety developed by indian scientists. Saltresistant rice offers hope for farmers clinging to. China already produces more rice than any other country on earth, but if chinese farmers had access to rice that grows in saltwater, they could plant it in the vast saltwater. Sharma, head, division of crop improvement, central soil salinity research institute.
Susceptibility and tolerance of rice crop to salt threat plos. Amelioration of nacl electric conductivity 15 mmho cm. Mutation induction, a useful tool to generate salt tolerant plants, enables the analysis of plants with similar genetic background, facilitating the understanding of the salt tolerance mechanisms. Isolation and identification of salttolerant plantgrowthpromoting rhizobacteria and their application for rice cultivation under salt stress. Modern high yielding rice varieties are particularly sensitive to high salt stress. Here, the indica rice sea rice 86 sr86 seedlings showed higher tolerance than ordinary rice varieties in saline soil, and a dominant effect. Salt tolerant and sensitive rice varieties display. Identification of superior alleles for seedling stage salt tolerance in. Salt tolerant genes in rice to improve productivity scimex.
Frontiers physiological basis and transcriptional profiling. Salttolerant and plantgrowthpromoting bacteria isolated. Researchers design salttolerant varieties of indian rice. An extensive literature survey indicated that there have been very few attempts to develop reproductive stagespecific salt tolerance in rice probably due to the lack of salt tolerant phenotypes at the reproductive stage. Our study offers new insights on salinity tolerance and presents useful candidate genes that will help in markerassisted gene pyramiding to develop salt tolerant rice varieties. May 01, 2015 salt tolerant and sensitive rice varieties oryza sativa l. Rice salinity tolerance is complex, both genetically and physiologically. In the current study, the researchers transferred the two genes.
Mar 23, 2015 mutmap accelerates breeding of a salttolerant rice cultivar. Apr 17, 20 worlds most saltresistant rice discovered. It is imperative to develop salt tolerance rice cultivars with high yield potential and grain quality using modern tools of biotechnology. Dec 12, 2018 growth and productivity of rice is negatively affected by soil salinity. Pdf identification of salt tolerant rice genotypes and. Porteresia coarctata is a native of india, sri lanka, bangladesh and myanmar and is. Identification of candidate genes associated with salt tolerance. Rice cultivars with differing salt tolerance contain. Identification and validation a major qtl from sea rice 86. Because of this reason salt tolerant rice were improved to generate new tolerant lines by using various technique such as back crossing, radiationinduced mutation or.
Salttolerant rice offers hope for global food supply. Lpt123tc171 is a salt tolerant st and drought tolerant dt rice line that was selected from somaclonal variation of the original leuang pratew 123 lpt123 rice cultivar. Lpt123tc171 is a salttolerant st and droughttolerant dt rice line that was selected from somaclonal variation of the original leuang pratew 123 lpt123 rice cultivar. The present study was designed to assess the adoption and impact on income of salt tolerant rice varieties viz. A group of indian scientists has developed a new salttolerant transgenic rice plant by overexpressing a gene from wild rice called porteresia coarctata into the commonly used ir 64 indica rice variety. Crisprcas9 directed genome engineering for enhancing salt stress tolerance in rice. Impact of adopting salt tolerant rice varieties in the.
Crop productivity in rice is harshly limited due to high concentration of salt in the soil. Identification of molecular markers linked to salt. In their study, salt tolerant rice variety csr 1 was found to survive better with an esp t of 20. The salt climate change is reshaping land and lives in indias sundarbans region, where paddies are. The mechanism of salt tolerance takes place at three levels of organization. Salt tolerant and sensitive rice varieties oryza sativa l. Please click on the icon to open this manual in pdf format.
Saltresistant rice offers hope for farmers clinging to disappearing islands. Identification and validation a major qtl from sea rice. Susceptibility or tolerance of rice plants to high salinity is a coordinated action of multiple stress. Isolation and identification of salttolerant plantgrowth. However, salt stress problems in field crops can effectively be mitigated through the use of tolerant rice varieties and proper management and mitigation strategies. Harmonizing technological advances in phenomics and. Rice is a staple food for over half of the worlds population, yet it is also the most saltsensitive cereal crop, putting it at risk to future environmental challenges. They could produce 50 million tonnes of food, enough to feed 200 million people. Nongmo salttolerant rice helps bangladesh farmers genetic.
Association of snp haplotypes of hkt family genes with. A group of indian scientists has developed a new salttolerant transgenic rice plant by overexpressing a gene from a wild rice called porteresia coarctata into the commonly used ir 64 indica rice variety. Using markerassisted backcrossing mabc to develop a new salt tolerance rice cultivar is one of the feasible methods to cope with these devastating changes. Paul, a samia parveen, a saiful alam, a naziza rahman, a bushra jannat, a sirajul hoque, b mohammad tariqur rahman, c muhammad manjurul karim a. Endophytes were isolated from 720 leaf and root segments as well as seeds from the saltsensitive ir64 variety and salttolerant pokkali rice varieties. Molecular dissection of seedling salinity tolerance in rice. To understand the intricacies of the mechanism it is important to unravel the key pathways operating inside the plant cell. Pdf advances in understanding salt tolerance in rice.
Salinity threat is estimated to reduce global rice production by 50%. Pdf mutmap accelerates breeding of a salttolerant rice. Evaluation for salt tolerance in rice using multiple. Pdf improvement of salinity stress tolerance in rice. China is developing rice that grows in saltwater futurism.
With characterization of these landraces, suitable candidate genes for salinity tolerance could be identified to introgress into modern rice varieties. Sharma, head, division of crop improvement, central. In this study, 305 bacteria were isolated from paddy soil in taoyuan, china. Plants of twelve genotypes were grown in sand tanks in a. May 18, 2016 salt resistant rice offers hope for farmers clinging to disappearing islands.
Evaluation of salt tolerance in rice genotypes by physiological characters. In this study, we screened a total of 92 genotypes and selected the most salinity tolerant line ss114 and most susceptible line. Pdf salt tolerance is an important constrain for rice, which is generally categorized as a typical glycophyte. Porteresia coarctata is a native of india, sri lanka, bangladesh and myanmar and is grown mainly in saline estuaries in a report published in journal scientific reports, scientists led by. Amelioration of salinity effect in salt tolerant rice oryza. The plant genome original research molecular karyotyping. The salt climate change is reshaping land and lives in indias sundarbans region, where paddies are being overrun by.
Jan 17, 2018 however, information regarding the improvement of salt tolerance in cultivated rice using wild rice genes is limited. In this study, we identified a salttolerant line dongxiangningjing 15 dj15 under saltstress field conditions from the population of a salt tolerant dongxiang wild rice. Evaluation of salt tolerance in rice genotypes by multiple. Summary of genetic engineering approach for salinity stress tolerance in rice. Oct 25, 2017 agricultural scientist yuan longping, known as chinas father of hybrid rice, told mainland media that if a tenth of such areas were planted with rice species resistant to salt, they could boost chinas rice production by nearly 20 per cent. Most of the initial salt tolerant rice varieties like damodar csr 1, dasal csr 2, getu csr 3, hamilton were the pure line selections from the local traditional cultivars. Therefore, the aim of this experiment was to uncover prospective rice landraces tolerant to salinity. Apr 16, 20 scientists have successfully bred a rice variety that is salt tolerant, which could enable farmers to reclaim coastal areas rendered useless by sea water, a philippinebased institute said tuesday. Salinity stress is a major constrain in the global rice production and hence serious efforts are being undertaken towards deciphering its remedial strategies. Molecular breeding to improve salt tolerance of rice. Modulation of salt tolerance in thai jasmine rice oryza sativa l.
Dash a rhitu rai a sandeep yadav b pramod kumar b ananda k. The ir29 is an indica variety referred as saltsensitive standard 15. Akbar m and yabuno t 1974 breeding for salineresistant varieties of rice. Dna extracted from seedlings of nine salttolerant local rice landraces and three established salttolerant rice varieties was subjected to random amplified polymorphic dna rapd analysis using a. Exogenous supply of putrescine on salt stressed plants considerably increased the shoot growth fresh. This study clearly brought out the extent of intraspecific variability for salt tolerance in rice. An endophyte from salt adapted pokkali rice confers salt tolerance to a salt sensitive rice variety and targets a unique pattern of genes in its new host.
Success stories on development, spread and impact of salt. So far a few rice landraces have been identified as a source of salt tolerance and utilized in rice improvement. Salt stress response indices ssri were used to classify the 74 rice genotypes. Susceptibility and tolerance of rice crop to salt threat. It is a traditional, tall, susceptible to lodging, photoperiodsensitive rice variety with low tillering and long, broad, dark, and droopy leaves. Salt tolerance is an important constrain for rice, which is generally categorized as a typical glycophyte. Figure 1 shows that the inhibitory effect of salt stress on growth of the introgression line rz35 was greater than that of matsumae at the seedling stage. Comprehensive analysis of the physiological and metabolite changes in rice plants from salinity stress i. Scientists have successfully bred a rice variety that is salttolerant, which could enable farmers to reclaim coastal areas rendered useless by sea.
Porteresia coarctata is a native of india, sri lanka, bangladesh, and myanmar and is grown mainly in saline estuaries. For developing salt tolerant rice varieties through conventional breeding or biotechnological interventions, there is an urgent need to identify natural allelic variants that may confer salt tolerance. Identification of salt tolerant rice genotypes and their genetic diversity analysis using ssr markers. Pokkali type of rice varieties are highly salt tolerant and commonly grows in coastal areas of kerala state, india. Genetic dissection of salt tolerance in rice louisiana. Crisprcas9 directed genome engineering for enhancing salt. But their impact on income analysis is not done yet.
However, some salt tolerant bacteria improve the health of plants under saline stress. Scientists develop salt tolerant rice variety biovoicenews. Emerging stateofthe art technologies have provided the tools to discover the key components inside the plant cell for salt. Materials and methods plant materials the study used six rice varieties. Therefore, developing salt tolerant and highyielding rice using quantitative trait loci qtls and linkage markers is a priority for molecular breeding. Identification of salt tolerant rice genotypes and their. Mutmap accelerates breeding of a salttolerant rice. Pdf salinity and salt tolerance improvements in thai rice. Rwsalt tolerant list salt tolerance low mod hilow mod hi scientific name common name recycled water low mod hilow mod hi. Molecular breeding to improve salt tolerance of rice oryza. Harmonizing technological advances in phenomics and genomics.
This new research into rice builds on previous work by acpfg researchers into the salt tolerance of plants and was conducted in. An endophyte from saltadapted pokkali rice confers salt. Heritable alteration in salttolerance in rice induced by. The comparative analysis of differential response of salt sensitive and salt tolerant lines is a judicious approach to obtain essential clues towards understanding the acquisition of salinity tolerance in rice plants.
A group of indian scientists at the division of plant biology at bose institute supported by funds from the department of biotechnology has developed a new salttolerant transgenic rice plant by overexpressing a gene from a wild rice called porteresia coarctata into the commonly used ir 64 indica rice variety. Scientists develop salt tolerant rice variety down to earth. Furthermore, a survivorship assay showed that under unstressed control condition, both lines had 100% survival rate. Interdependency of reactive oxygen species generating and. Porteresia coarctata is a native of india, sri lanka, bangladesh and myanmar and is grown mainly in saline estuaries. Recently, the role of dna methylation, genome duplication and codon usage bias in salinity tolerance of rice have been studied. The second gene, pcimt1, codes for a protein that produces a derivative of inositol, called pinitol. Advances in understanding salt tolerance in rice springerlink. Evaluation of salt tolerance in rice genotypes by multiple agronomic. Soil salinity is a major constraint to rice production in large inland and coastal areas around the world. Dna extracted from seedlings of nine salt tolerant local rice landraces and three established salt tolerant rice varieties was subjected to random amplified polymorphic dna rapd analysis using a number of random decamer primers. The objective of this study was to identify the changes in the rice genome that possibly lead to st andor dt characteristics. There are salt tolerant landraces and traditional varieties of rice but with limited information on genomic regions qtls and genes responsible for their tolerance. Unfortunately, this book cant be printed from the openbook.
Traditional rice landraces of coastal area in bangladesh are distinct regarding their phenotype, response to salt stress and yield attributes. Rice genotypes were evaluated for salt tolerance in terms of grain yield and physiological characters. Mutmap accelerates breeding of a salt tolerant rice cultivar article pdf available in nature biotechnology 33. Plant material, growth conditions and salt stress treatments. Pokkali is also an indica variety and has been widely used as salt. The identification of genomic regions associated with salt. Genotypes fed 473 and ir85427 were identified as the most salt tolerant and salt sensitive, respectively. However, information regarding the improvement of salt tolerance in cultivated rice using wild rice genes is limited. The objective of this study was the evaluation of parental lines for salt tolerance in rice using multiple screening methods. Mapping qtls for salt tolerance in rice oryza sativa l. An extensive literature survey indicated that there have been very few attempts to develop reproductive stagespecific salt tolerance in rice probably due to the lack of salttolerant phenotypes at the reproductive stage. Australian plant phenomics facility research reveals salt tolerant genes in rice to improve productivity. Mapping of salt tolerance qtls in introgression lines. The ir29 is an indica variety referred as saltsensitive standard.
Some recently developed salt tolerant rice varieties are introduced in the coastal zone of bangladesh. Therefore, developing salttolerant and highyielding rice using quantitative trait loci qtls and linkage markers is a priority for molecular breeding. Goals objectives the overall goal of this proposal is to unravel the genetic basis of salt tolerance mechanisms operating in rice and exploit this information to accelerate breeding of rice varieties with improved salt tolerance. If you can bring in salttolerant rice or other salttolerant crops, like sunflower. Frontiers improvement of salt tolerance using wild rice. Pokkali type of rice varieties are highly salttolerant and commonly grows in coastal areas of kerala state, india.
Salt tolerance screening in rice using hydroponics contents 1. In this work, we generated three salt tolerant mutant lines by irradiation of a salt sensitive cultivar. Scientists develop salt tolerant rice variety the hindu. Author links open overlay panel sufia farhat a neha jain a nisha singh a rohini sreevathsa a prasanta k. Later on other salt tolerant varieties like csr 10. If you need to print pages from this book, we recommend downloading it as a pdf. Mar 16, 2018 traditional rice landraces of coastal area in bangladesh are distinct regarding their phenotype, response to salt stress and yield attributes. Scientists develop salt tolerant rice variety indus scrolls.
Endophytes were isolated from 720 leaf and root segments as well as seeds from the saltsensitive ir64 variety. However, the utilization of physiological characters in salt tolerance breeding in no way reduces the signi. Also, overlapping of qtls related to salt tolerance was observed in this study. Salinity tolerance loci revealed in rice using high. It is hoped that genomics approaches will play a greater part in this exploitation of land by providing salt tolerant crop cultivars. The plant genome abstract original research molecular. A group of indian scientists has developed a new salttolerant transgenic rice plant by overexpressing a gene from a wild rice called porteresia coarctata. Approaches for developing of salt tolerant rice plants. Mutmap accelerates breeding of a salttolerant rice cultivar. Saline stress severely affects rice oryza sativa l. Sep 28, 2016 salinity is a complex trait that affects growth and productivity in many crops, including rice. However, the production and the cultivating areas are adversely affected from the threats of devastation caused by the rise of sea level. Rice is a stable food in vietnam and plays a key role in the economy of the country. Identification of new qtl for salt tolerance from rice.
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