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L RGS F ood S ecurity R ice R esearch

L RGS F ood S ecurity R ice R esearch . Abstract

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L RGS F ood S ecurity R ice R esearch

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  1. LRGS Food Security Rice Research • Abstract • Rice is most susceptible to salinity stress, the threshold or slope of rice (Oryza sativa) is Ece=3.0 dsm-1. It appears that increasing the rice production by expansion of planting areas is not an ideal solution. Despite of competing for urbanization, available lands for rice plantation are scarce due to abiotic stresses such saline prone areas. Therefore, manipulation of cellular mechanisms in rice plants to promote salinity adaptation is the key to effectively improve the rice production. To understand this cellular function, a total of 92 genotypes obtained from IRRI(31stIRSSTN-SS1 and 31stIRSSTN-SS2) were subjected to 72 hrs of salinity stress (50 mMNaCl, Ece=6dsm-1). Genotypes that showed good germination rate and sustained in high salinity solution were selected for further metabolomics analysis. In this study, 64 genotypes successfully germinated under saline condition, in which only 3 genotypes show 100% germination rate. The root length produced under this short term salinity shock ranges from 2 cm to 10 cm while the highest number of lateral root can be observed were 60 lateral roots per seedlings . A total of 11 genotypes that significantly tolerate to short term salinity are selected for further analysis. Results from this study give the overview of the number of tolerant lines of IRRI 31st IRSSTN-SS1 and 31st IRSSTN-SS2 following salinity treatment (50 mMNaCl=6dsm-1). Future works such as long term salinity screening and the subsequence profiling of salinity responsive metabolites are needed to characterize salinity tolerance mechanism in rice plant. Identification of High Quality And Salinity Tolerance Genotypes As Model For Further Cellular Activities Observation to Illustrate The Key Mechanism That Promotes Adaptation to Salinity Stress in Rice Plant 1 Ma Nyuk Ling, 1Aziz, A and 2Abdullah M.Z1Department of Biological Sciences, Faculty of Science and Technology2Department of Agrotechnology, Faculty of Agrotechnology and Food SciencesUniversiti Malaysia Terengganu, 21030 Kuala Terengganu, Terengganucorresponding Email: nyukling@umt.edu.my and aaziz@umt.edu.my Figure 1: Germination rate (%) of the 92 genotypes tested: IRSSTN-SS1 IRSSTN-SS2 Figure 2: Root length and number of lateral roots following 72 hrs of 50 mMNaCl treatment of IRSSTN-SS1 and SS2 Figure 3: Roots of germinated rice genotypes that showed higher salinity stress tolerance compared to variety MR219. Acknowledgement This study is supported by LRGS Food Security Rice Research (vot 53104). We thank International Rice Research (IRRI) for the Seed

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