Physio-biochemical and molecular characterization for drought tolerance in rice genotypes at early seedling stage

Abstract

KEYWORDSWater stress PEG Antioxidant enzymes Oryza sativa Growth traits Physiological aspects SSR markers ABSTRACTThe aim of the current investigation was to study the influence of drought-stressed by using PEG on some rice genotypes at seedling stage. The performance was judged by growth, physiological, biochemical and molecular constituents at seedling stage. The results of study suggested that growth attributes were reduced under different drought stress (70 and 140 g/L PEG) in most of the cases as compared with control. Among various tested genotypes IRAT 259, Line 7 and Line 8 exhibited the lowest reduction values of relative water content, chlorophyll content and membrane stability index at 70 and 140 drought levels. The Line 8 produced the highest amount of proline under stress conditions which is indicating its highest tolerance to drought stress. The antioxidant enzymes such as catalase, peroxidase and polyphenol oxidase were induced by the drought levels. The growing expressions of antioxidant enzymes assist the plant for adaptation of plant under environmental conditions and tolerate stress. The IRAT 259 has highest increase percentage in antioxidant enzymes under stress. Total sixteen SSR primers examine for characterizing the power of each SSR primer by calculating polymorphic information contents and a total of 41 alleles were amplified using 16 SSR primers. The variation in number of amplified alleles per primer ranged from one allele as for wmc27 to five alleles for wmc179 and wmc 215, with an average of 2.56 alleles. The highest value was 100% polymorphism belonged to

Agro-Physiologic Responses and Stress-Related Gene Expression of Four Doubled Haploid Wheat Lines under Salinity Stress Conditions

“…Therefore, DHL2 may have used Na + as an osmoticum to tolerate salt and osmotic stress, having demonstrated superior ability for tissue-tolerance. This could play a role in the great extent of carbohydrate storage through photosynthesis for as long as possible [48,66]. The inability of plants to avoid salt from reaching toxic levels in transpiring leaves may obstruct photosynthesis.…”

Evaluatıon of growth and yıeld traıts ın corn under ırrıgatıon regımes ın sub-tropical climate

“…The application of less water negatively responded on the plant height (crop sensitivity to drought stress) subsequently reducing the grain yield (English, 2010). It was reported by various researchers that various plant growth attributes were reduced under different water stress conditions (Al-Ashkar et al, 2016;Hassan et al, 2016;Rashwan et al, 2016). …”