Water-deficit tolerant classification in mutant lines of indica rice

Abstract

Water shortage is a major abiotic stress for crop production worldwide, limiting the productivity of crop species, especially in dry-land agricultural areas. this investigation aimed to classify the water-deficit tolerance in mutant rice (Oryza sativa L. spp. indica) genotypes during the reproductive stage. Proline content in the flag leaf of mutant lines increased when plants were subjected to water deficit. relative water content (rWC) in the flag leaf of different mutant lines dropped in relation to water deficit stress. A decrease rWC was positively related to chlorophyll a degradation. Chlorophyll a , chlorophyll b , total chlorophyll , total carotenoids , maximum quantum yield of PSII , stomatal conductance , transpiration rate and water use efficiency in mutant lines grown under water deficit conditions declined in comparison to the well-watered, leading to a reduction in net-photosynthetic rate. In addition, when exposed to water deficit, panicle traits, including panicle length and fertile grains were dropped. the biochemical and physiological data were subjected to classify the water deficit tolerance. NSG19 (positive control) and DD14 were identified as water deficit tolerant, and AA11, AA12, AA16, bb13, bb16, CC12, CC15, EE12, FF15, FF17, G11 and Ir20 (negative control) as water deficit sensitive, using Ward's method.

Bacterial mediated amelioration of drought stress in drought tolerant and susceptible cultivars of rice (Oryza sativa L.)

“…After harvesting, fresh weight were taken immediately and sample were placed in -80°C for determination of antioxidant activity. Soil water content (SWC) for each harvesting was calculated using the weight fraction: SWC (%) = [(FW-DW)/DW] × 100, where FW was the fresh weight of a soil portion of the middle part of each pot and DW was the dry weight of the soil portion after drying in a hot air oven at 80°C for 48 h or till the complete drying of soil (Cha-um et al, 2012).…”

Physio‐morphological, biochemical, and anatomical traits of drought‐tolerant and susceptible sorghum cultivars under pre‐ and post‐anthesis drought

“…Drought is one of the key abiotic stresses limiting crop productivity worldwide (Cha‐um et al ., 2012), affecting plant productivity by inducing stomatal closure, and thereby reducing photosynthesis (Németh et al ., 2002) and growth (Bibi et al ., 2012). With growing effects of climate change, the development of drought‐tolerant and climate‐resilient crops is essential for survival under unfavorable environmental conditions and maintenance of high yield.…”

Screening of Elite Coarse Rice Lines for Drought Stress Simulated by Polyethylene Glycol (PEG) at Seedling Stage

“…Due to drastic change in climate and increased in the population of world, it is becoming difficult to meet the human requirements (food, shelter, and other necessities) (HongBo et al, 2005;Akram, 2007). Rice plant is sensitive to drought conditions, as it exhibit negative impact when subjected to the moisture stress condition at critical stages of development (Cha-Um et al, 2010) and approximately 50% of the world's rice crop production is impacted by water shortage conditions (Mostajean and Rahimi-Eichi, 2009). The impact of water stress was greater during the germination and seedling stages, which shows the crop sensitivity to moisture stress at these stages, effect the overall success of a crop (Tsago et al, 2014;Khayatnezhad et al, 2010).…”