Screening for Osmotic Stress Responses in Rice Varieties under Drought Condition

Šimon, S.; Shylaraj, K. S.

doi:10.1016/j.rsci.2017.04.004

Cited by 102 publications

(79 citation statements)

References 36 publications

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“…During screening, waterdeficit stress is artificially induced by desired strengths of polyethylene glycol 6000 (PEG-6000; Sigma Chemicals). Polyethylene glycol has beenused to simulate water stress effects in plants (Swapna and Shylaraj, 2017).The experiment was laid out in a complete randomized design (CRD) with five levels of drought stress and four replications. Distilled water was used as a control (0 MPa) and osmotic potentials -0.3, -0.6, -0.9 and -1.2 MPa were created by adding PEG-6000 @ 5, 10, 15 and 20 g per 100 ml distilled water.…”

Section: Methodsmentioning

confidence: 99%

Evaluation of Rice (<i>Oryza sativa</i> L.) Genotypes for Drought Tolerance at Germination and Early Seedling Stage

et al. 2018

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Drought stress is a major constraint to the production and yield stability of crops. Rice (Oryza sativa L.) is considered as a drought-sensitive crop species. Within this species, there are considerable varietal differences in sensitivity to this environmental stress. An experiment was conducted at the laboratory of the Department of Agronomy, Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Bangladesh during April to September 2016 to evaluate 100 rice genotypes for drought tolerance during germination and early seedling growth stage. The genotypes were tested against five levels of drought stress imposed by Polyethylene glycol 6000 (PEG-6000) @ 0, 5, 10, 15 and 20%. The experiment was laid out in a complete randomized design with four replications. The results showed that with increasing water stress, germination in all the genotypes decreased from 95.8% in control to 6.6 % in highest stress (20% PEG) level. Seedling height and dry weight also decreased in all rice genotypes with the increase in water stress level. Based on Standard Evaluation System (SES),18 genotypes were selected primarily. Among the 18 genotypes, Ratoil and Chinisakkar showed higher germination index, relative seedling height and relative seedling dry weight than the check drought tolerant BRRI dhan43 at 20% PEG. Beside these, performance of Kumridhan, Pusur and Somondori was also well at this level compared to BRRI dhan43. The genotypes Ratoil, Chinisakkar, Kumridhan, Pusur and Somondori showed the best performance under drought condition. The Agriculturists 2018; 16(1) 44-54

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Section: Methodsmentioning

confidence: 99%

Evaluation of Rice (<i>Oryza sativa</i> L.) Genotypes for Drought Tolerance at Germination and Early Seedling Stage

et al. 2018

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“…On the fourth day, the seeds were transferred to Yoshida's nutrient medium and allowed to grow for 3 days. Water-deficient stress was artificially induced by the desired strength of PEG 6000 under hydroponic screening [22]. A progressive model was used for the application of nutrient hydroponic solution.…”

Section: Mineral Solubilizationmentioning

confidence: 99%

Mitigation of drought stress in rice crop with plant growth‐promoting abiotic stress‐tolerant rice phyllosphere bacteria

Sabarinathan

Gomathy

et al. 2020

J Basic Microbiol

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In the search of effective drought‐alleviating and growth‐promoting phyllosphere bacteria, a total of 44 bacterial isolates were isolated from the leaf surface of drought‐tolerant rice varieties, Mattaikar, Nootripattu, Anna R(4), and PMK3, and screened for their abiotic stress tolerance by subjecting their growth medium to temperature, salinity, and osmotic stress. Only eight isolates were found to grow and proliferate under different abiotic stress conditions. These isolates were identified using 16S ribosomal DNA gene sequence and submitted to the NCBI database. All the bacterial isolates were identified as Bacillus sp., except PB24, which was identified as Staphylococcus sp., and these isolates were further screened for plant growth‐promoting (PGP) traits such as IAA production, GA production, ACC deaminase activity, and exopolysaccharide production under three different osmotic stress conditions adjusted using polyethylene glycol (PEG 6000). Additionally, mineral solubilization was measured under the normal condition. Bacillus endophyticus PB3, Bacillus altitudinis PB46, and Bacillus megaterium PB50 were found to have multifarious PGP traits. Consecutively, the performance of an individual strain to improve the plant growth was investigated under the osmotic stress (25% PEG 6000) and nonstress condition by inoculating them into rice seeds using hydroponics culture. Furthermore, the drought‐alleviating potency of bacterial strains was assessed in the rice plants using pot experiment (−1.2 MPa) through bacterial foliar application during the reproductive stage. Finally, as a result of seed inoculation and foliar spray, the application of B. megaterium PB50 significantly improved the plant growth under osmotic stress, protected plants from physical drought through stomatal closure, and improved carotenoid, total soluble sugars, and total protein content. Metabolites of PB50 were profiled under both stress and nonstress conditions using gas chromatography–mass spectroscopy.

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“…This germplasm collection represents a gene pool that can be explored for selection and improvement of drought tolerance in upland rice, as well as for the production of superior pigmented upland rice cultivars that are currently of limited availability in Indonesia (Santika and Rozakurniati, 2010;IAARD, 2012) and perhaps in other parts of the world as well. Some studies have investigated the use of osmo-priming compounds such NaCl, KCl or polyethylene glycol (PEG) to assess the effect of soil moisture stress on seed germination and on seedling growth (Islam et al, 2012;Singh et al, 2017a;Swapna and Shylaraj 2017;Mishra and Panda 2017). These priming methods, require specific standard methods to validate the moisture stress generated under field conditions (Singh et al, 2017b).…”

Section: Introductionmentioning

confidence: 99%

Drought tolerance indices for selection of drought tolerant, high yielding upland rice genotypes

Mau¹,

Ndiwa²,

Oematan³

et al. 2019

Aust J Crop Sci

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The purposes of this study were (1) to assess the effectiveness of drought tolerance indices for selection of drought tolerance in upland rice, and (2) to identify the most suitable drought tolerance indices to select for drought tolerant, high yielding upland rice genotypes. This study employed a Split Plot design consisting of irrigation levels as the main plots, and rice genotype as the sub-plot treatments. There were three main plots: 100% field capacity (FC); 75% FC; and 50% FC level. The subplot treatments consisted of 40 upland rice genotypes. Grain yields under no-stress and stressed conditions were used to calculate drought tolerance indices. There were significant variations in grain yields and drought tolerance indices between different rice genotype treatments. The indices from the literature found to be most suitable for the selection of drought tolerant upland rice cultivars were STI, GMP, MRP, HARM, REI, ATI, YI, SNPI. Ten genotypes from among the 40 tested-namely HK-07, ADN-04, PMK-01, ADN-05, NGR-022, ALR-02, HK-06, and KMD-01-were selected as combining drought tolerance with high yield potential.

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Screening for Osmotic Stress Responses in Rice Varieties under Drought Condition

Cited by 102 publications

References 36 publications

Evaluation of Rice (<i>Oryza sativa</i> L.) Genotypes for Drought Tolerance at Germination and Early Seedling Stage

Evaluation of Rice (<i>Oryza sativa</i> L.) Genotypes for Drought Tolerance at Germination and Early Seedling Stage

Mitigation of drought stress in rice crop with plant growth‐promoting abiotic stress‐tolerant rice phyllosphere bacteria

Drought tolerance indices for selection of drought tolerant, high yielding upland rice genotypes

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