Salt stress causes significant reductions in rice production worldwide thus, improving salt tolerance is a promising approach to meet the increasing food demand wild rice germplasm is considered a valuable genetic resource for improving rice cultivars however, information regarding the. More importantly, information concerning the differential genotypic response to salinity will provide the plant breeder with important tools for improving the salt tolerance in rice. Salinity is a serious issue in rice, the crop that feeds half the world, since it is sensi- tivetosalt accumulationwiththe world populationgrowing incessantly, there is an.
Rice, oat, barley, maize, sorghum and millet through biotic ap- proaches (conventional breeding, marker assisted selection and genetic engineering for salt tolerance. Rice is sensitive to salinity, particularly during the seedling stage (maas and hoffman 1977) and the earlier set benchmarks (maas and grattan 1999 hanson et al 1999) indicate that rice yield decreases 12% for every unit (ds/m) increase in ece above the threshold tolerance of 30 ds m −1 (maas 1990. Regardless, expressing genes in a cell type-specific manner has improved the salinity tolerance of rice and may be useful in improving tolerance to a wide variety of crop stresses including ion toxicities, mineral deficiencies and potentially even biotic stresses of the roots or leaves.
The typical mechanism of salinity tolerance in rice is the exclusion or reduction of na uptake and increased absorption of k to maintain a good na-k balance in the shoot the detection of salinity induced injuries, however, are very complex even under. Salinity is a major abiotic stress limiting growth and productivity of plants in many areas of the world due to increasing use of poor quality of water for irrigation and soil salinization. Several factors in the intensive cropping system have played significant role in deteriorating soil health in general soil salinization is one of the major issues threatening crop productivity in.
Increase in plant growth of both cultivars at 25 mm nacl stress, and that proline increased grain yield of only salt-sensitive rice at same salt stress salt stress significantly decreased chlorophyll and ascorbate contents, straw k + /na + ratio and activity of antioxidant. Hanoi, april 2016 improving rice tolerance of submergence and salinity to cope with climate change in coastal areas of vietnamese deltas. In order to elucidate the role of antioxidant responses in salinity tolerance in rice genotypes under salt stress, experiments were conducted using four rice varieties, including salt-sensitive brri dhan 28 and three salt-tolerant varieties brri dhan 47, bina dhan 8 and bina dhan 10. The increase in trehlose levels in transgenic rice lines of pusa basmati-1 using either tissue specific or stress dependent promoter, resulted into the higher capacity for photosynthesis and concomitant decrease in the extent of. Salt stress affects about 25% of the 44 million ha of irrigated and lowland systems for rice cultivation in west africa (wa) a major quantitative trait locus (qtls) on chromosome 1 (saltol) that enhances tolerance to salt stress at the vegetative stage has enabled the use of marker-assisted selection (mas) to develop salt-tolerant rice cultivar(s) in wa.
[beijing] researchers in china and the united states have identified a rice gene linked to salt tolerance, raising hopes of improving the ability of asia's most important crop to grow in saline soils. That hinder the success of the improvement of salinity stress tolerance in rice and identify potential opportunities for enhancing salinity stress tolerance in this important crop 2. Running title: improving stress tolerance in wheat using thiourea potential of foliar applied thiourea in improving salt and high temperature tolerance of bread wheat (triticum aestivum. Ipps-chennai - rk new phenotyping technique for salinity tolerance at reproductive stage in rice c diana c palao 1,2, cb de la viña 2, n aiza vispo.
The major qtl for salinity tolerance ie saltol is being transferred to the improved background as well as adapted rice varieties saltol located on chromosome 1, is linked with ssr markers like rm 8094, rm 493 and rm 3412. Despite many attempts using different strategies to improve salinity tolerance in rice, the achievements so far are quite modest this review aims to discuss challenges that hinder the improvement of salinity stress tolerance in rice as well as potential opportunities for enhancing salinity stress tolerance in this important crop. 10 improving salt tolerance in rice: looking beyond the conventional 221 fig101 worldwide distribution of sodic and saline soils showing prominence of saline soils in major rice growing regions of south and southeast asia.