title: Physiological performance of two contrasting rice varieties under water stress.
abstract: Two rice varieties PR-115 and Super-7 were imposed to water stress and different physiological traits were monitored to evaluate the performance of these varieties under drought. Under water stress condition although the relative water content, osmotic potential, chlorophyll content, photosynthesis rate, carbon discrimination and biomass decreased in both the varieties however, the reduction was more pronounced in Super-7 variety. Oryzanol a trans-ester of ferulic acid functions as antioxidant and it increased along with total phenolic and anthocyanin content in both the varieties under drought stress. However, gallic acid, 4 hydroxy benzoic acid, syringic acid and chlorogenic acid showed differential pattern in both of the varieties under water limiting conditions. Under drought, grain yield was penalized by 17 and 54% in PR-115 and Super-7 varieties, respectively in comparison to watered plants. Super-7 variety showed pronounced electrolyte leakage and MDA enhancement under water stress condition. High non photochemical quenching and reduction in Y(NO) and Y(II) indicated balanced energy management in tolerant PR-115 variety. The studies showed that PR-115 is a drought tolerant variety while Super-7 is drought sensitive in nature.
authors.affiliation: Plant Physiology Division, Council of Scientific and Industrial Research (CSIR) - National Botanical Research Institute, Rana Pratap Marg, Lucknow, 226001 India.
authors.forename: Furqan
authors.initials: F
authors.lastname: Khan
authors.affiliation: Plant Physiology Division, Council of Scientific and Industrial Research (CSIR) - National Botanical Research Institute, Rana Pratap Marg, Lucknow, 226001 India.
authors.forename: Priyanka
authors.initials: P
authors.lastname: Upreti
authors.affiliation: Plant Physiology Division, Council of Scientific and Industrial Research (CSIR) - National Botanical Research Institute, Rana Pratap Marg, Lucknow, 226001 India.|Biotechnology Division, CSIR - Central Institute of Medicinal and Aromatic Plants, P.O-CIMAP, Near Kukrail Picnic Spot, Lucknow, 226 015 India.
authors.forename: Ruchi
authors.initials: R
authors.lastname: Singh
authors.affiliation: Department of Biological Sciences, Sam Higginbotom Institute of Agriculture, Technology and Sciences, Naini, Allahabad, 211 007 India.
authors.forename: Pradeep Kumar
authors.initials: PK
authors.lastname: Shukla
authors.affiliation: Plant Physiology Division, Council of Scientific and Industrial Research (CSIR) - National Botanical Research Institute, Rana Pratap Marg, Lucknow, 226001 India.
authors.forename: Pramod Arvind
authors.initials: PA
authors.lastname: Shirke
keywords: Carbon discrimination; Drought; Oryza sativa; Oryzanol; Phenolic acids; Water use efficiency