Physiological Responses of Contrasting Rice Genotypes to Salt Stress at Reproductive Stage

Gerona, Maria Elisa B.; Deocampo, Marjorie P.; Egdane, James; Ismail, Abdelbagi M.; Dionisio-Sese, Maribel L.

doi:10.1016/j.rsci.2019.05.001

Cited by 85 publications

(70 citation statements)

References 57 publications

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“…Plant salt tolerance is growth stage-specific, and salt sensitivity differs at various growth stages [24,30]. In general, cereal plants are the most sensitive to salinity during the vegetative and early reproductive stages [31]. In recent years, the wheat planting area has been increasing in some saline regions of China.…”

Section: Salt Tolerance Estimation For Wheat Genotypesmentioning

confidence: 99%

Identification and Characterization of Wheat Germplasm for Salt Tolerance

Quan

Liang

et al. 2021

Plants

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Salinity is one of the limiting factors of wheat production worldwide. A total of 334 internationally derived wheat genotypes were employed to identify new germplasm resources for salt tolerance breeding. Salt stress caused 39, 49, 58, 55, 21 and 39% reductions in shoot dry weight (SDW), root dry weight (RDW), shoot fresh weight (SFW), root fresh weight (RFW), shoot height (SH) and root length (RL) of wheat, respectively, compared with the control condition at the seedling stage. The wheat genotypes showed a wide genetic and tissue diversity for the determined characteristics in response to salt stress. Finally, 12 wheat genotypes were identified as salt-tolerant through a combination of one-factor (more emphasis on the biomass yield) and multifactor analysis. In general, greater accumulation of osmotic substances, efficient use of soluble sugars, lower Na+/K+ and a higher-efficiency antioxidative system contribute to better growth in the tolerant genotypes under salt stress. In other words, the tolerant genotypes are capable of maintaining stable osmotic potential and ion and redox homeostasis and providing more energy and materials for root growth. The identified genotypes with higher salt tolerance could be useful for developing new salt-tolerant wheat cultivars as well as in further studies to underline the genetic mechanisms of salt tolerance in wheat.

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Section: Salt Tolerance Estimation For Wheat Genotypesmentioning

confidence: 99%

Identification and Characterization of Wheat Germplasm for Salt Tolerance

Quan

Liang

et al. 2021

Plants

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“…For instance, the Arabidopsis mutant Salt Overly Sensitive 5 ( sos5 ), which has defects in the middle lamella of the cell wall, is hypersensitive to salt stress (Shi et al ., 2003). In rice, the cell wall‐associated Proline‐Rich Protein 3 (PRP3) is required for cell wall integrity and cold tolerance (Gothandam et al ., 2010; Gerona et al ., 2019) and overexpression of β subunit of polygalacturonase 16 ( OsBURP16 ) decreases pectin content and increases abiotic stress sensitivity in rice (Liu et al ., 2014).…”

Section: Introductionmentioning

confidence: 99%

PHOTO‐SENSITIVE LEAF ROLLING 1 encodes a polygalacturonase that modifies cell wall structure and drought tolerance in rice

et al. 2020

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The biosynthesis and modification of cell wall composition and structure are controlled by hundreds of enzymes and have a direct consequence on plant growth and development. However, the majority of these enzymes has not been functionally characterised. Rice mutants with leaf-rolling phenotypes were screened in a field. Phenotypic analysis under controlled conditions was performed for the selected mutant and the relevant gene was identified by map-based cloning. Cell wall composition was analysed by glycome profiling assay. We identified a photo-sensitive leaf rolling 1 (psl1) mutant with 'napping' (midday depression of photosynthesis) phenotype and reduced growth. The PSL1 gene encodes a cell walllocalised polygalacturonase (PG), a pectin-degrading enzyme. psl1 with a 260-bp deletion in its gene displayed leaf rolling in response to high light intensity and/or low humidity. Biochemical assays revealed PG activity of recombinant PSL1 protein. Significant modifications to cell wall composition in the psl1 mutant compared with the wild-type plants were identified. Such modifications enhanced drought tolerance of the mutant plants by reducing water loss under osmotic stress and drought conditions. Taken together, PSL1 functions as a PG that modifies cell wall biosynthesis, plant development and drought tolerance in rice.

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“…Some mechanisms of salt-tolerance in plants can decrease Na + transport to young leaves, retaining toxic ions in lower tissues and old leaves. For example, ion sequestration by roots, partitioning of Na + in stems and petioles, compartmentalization of toxic ions in the vacuole, Na + exclusion from shoots, and the maintenance of K + in growing tissues include some mechanisms of salt-tolerance (Rahnama et al, 2011;Gerona et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…There is a large genotypic variation related to Na + and K + uptake and accumulation in some species, which can strongly modulate the biomass production (Rahnama et al, 2011;Gerona et al, 2019). Tolerant genotypes are more effective in reducing the concentration of toxic ions in photosynthetically active leaves than sensitive ones (Gerona et al, 2019). In wheat, studies verified that the reduction of Na + transport from root to shoot, Na + sequestration in leaf sheath, lesser Na + accumulation and higher K + /Na + ratio in plant tissues under saline conditions are associated with the genotypic characteristic of salttolerance (Rahnama et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Selection of sunflower genotypes for salt stress and mechanisms of salt tolerance in contrasting genotypes

et al. 2020

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Salinity is one of the main limiting factors for crop growth. The metabolic responses to salt stress are variable and depend on species characteristics. This study aimed to select sunflower genotypes tolerant to salt stress and evaluate some mechanisms of salt tolerance in two contrasting (salt-tolerant and salt-sensitive) genotypes. In the first assay, the biomass production and the accumulation of Na+ and K+ in 26 sunflower genotypes were evaluated. Genotypes AG963, AG967, AG972, BRS321, BRS324, H251, H360 and H863 showed lower biomass production and were characterized as salt-sensitive and the genotypes BRS323, Catisol, EXP11-26, EXP44-49, EXP60050, EXP887, HLA860HO and Olisun 5 showed higher biomass production and were considered salt-tolerant. The high K+ content and the low Na+ content in the leaves were the ion traits related to salt tolerance and can be used in sunflower breeding programs for this purpose. In the second assay, the plants of salt-tolerant BRS323 had lower Na+ and Cl- contents and higher levels of K+ than plants of salt-sensitive AG967. A better homeostasis in the mechanisms of transport, distribution and accumulation of inorganic solutes in conjunction with a more efficient osmoregulation mechanism through the synthesis of organic solutes may, at least in part, explain the greater salt-tolerance of BRS323 genotype in comparison to AG967.

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Physiological Responses of Contrasting Rice Genotypes to Salt Stress at Reproductive Stage

Cited by 85 publications

References 57 publications

Identification and Characterization of Wheat Germplasm for Salt Tolerance

Identification and Characterization of Wheat Germplasm for Salt Tolerance

PHOTO‐SENSITIVE LEAF ROLLING 1 encodes a polygalacturonase that modifies cell wall structure and drought tolerance in rice

Selection of sunflower genotypes for salt stress and mechanisms of salt tolerance in contrasting genotypes

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