Improvement of Salinity Stress Tolerance in Rice: Challenges and Opportunities

Hoang, Thi My Linh; Tran, Thach Ngoc; Nguyen, Thuy Kieu Tien; Williams, Brett; Wurm, Penelope; Bellairs, Sean M.; Mundree, Sagadevan

doi:10.3390/agronomy6040054

Cited by 190 publications

(124 citation statements)

References 163 publications

(161 reference statements)

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“…When subjected to salt stress, rice plants had very different reactions depending on the characteristics of each genotype. Different rice varieties have varied levels of salinity tolerance at different growth stages (Hoang et al, 2016). Rice is comparatively tolerant to salinity stress during germination, active tillering, and towards maturity, but is sensitive during early seedling and reproductive stages (Heenan et al, 1988;Zeng et al, 2001).…”

Section: Discussionmentioning

confidence: 99%

Selection for salinity tolerance in an international rice collection at vegetative stage

2019

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Water and soil salinity as the main abiotic stresses decrease crop yield and restrict the use of agricultural lands. In order to assess salt stress effect on seedling growth of rice and to select more tolerant rice genotypes, a factorial experiment was performed at two levels of NaCl namely non-stress (EC 1.2 dS m −1 ) and salt-stress (EC 10 dS m −1 ) in hydroponics with an international rice collection consisted of 155 varieties. Seven stress tolerance indices including STI, SSI, HM, RDI, SSPI, ATI and TOL were used to identify salt tolerant genotypes. The results of variance analysis showed that the effect of genotypes (G), Salt treatment (T) and G×T interaction were significant for all investigated traits (except for the effect of genotypes on shoot length). Under salt stress most genotypes showed similar trend of salt response, i.e. reduction in all traits. The results also revealed that dry weight (DW) was less affected than fresh weight (FW), and the shoot weight (SW) was affected more than the root weight (RW), indicating that shoot growth is more sensitive than root growth to salt stress. The Na + , K + and Na + :K + ratio were increased more than 713%, reduced 22% and increased more than 996% under salt stress, respectively. Four stress tolerance indices including MP, HM, GMP and STI showed highest correlation with each other and also with plant performance (Z-scores) under both normal and stress conditions; thus each of these indices can be used as the suitable indicators for screening salt tolerant genotypes. Based on the results, genotypes #84, #30 and #48 showed the highest performance and STI under salinity condition, so they have considerable potential to improve salt tolerance in rice breeding programs. In addition, genotypes #178, #198 and #6 with the lowest values of STI were found to be intolerant genotypes to salt stress.

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Section: Discussionmentioning

confidence: 99%

Selection for salinity tolerance in an international rice collection at vegetative stage

2019

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“…They concluded that flowering stage was being more sensitive than pod filling stage. Hoang et al (2016) found that rice was very tolerant at germination and tillering stage of its growth but were very sensitive at 1-2 leaf and flowering stages. Negrão et al (2017) reported that results of salinity would be different due to difference in crops and its sensitivity, methods of salinity imposition and salt used.…”

Section: Shoot Biomassmentioning

confidence: 99%

“…So the ability of the plants to continue to grow would indicate a high level of salt tolerance (Shrivastava and Kumar, 2015). Salt tolerant groundnut genotypes are selected depending upon certain well defined morphological and physiological characteristics related to tolerance (Hoang et al, 2016). Therefore, the objective of the present study was to develop standard protocol to screen groundnut germplasm under salinity stress condition at pre-sowing, vegetative, flowering and pod filling stages.…”

Section: Introductionmentioning

confidence: 99%

Morphophysiological and yield attributes of groundnut varieties under different salinity stress conditions

Yasmine

Rahman

Hasan

et al. 2019

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The study sought to evaluate the response of three groundnut genotypes (Binachinabadam-3, Dacca-1 and Zhingabadam) to various salt concentrations (D0 – Control, D1 – 2.5 dS/m, D2 – 5.0 dS/m, D3 – 7.5 dS/m, D4 – 10.0 dS/m, D5 – 12.5 dS/m) through observation of morphological and physiological characters. Based on relative performance of yield contributing characters and nutrient contents of leaves and stem, Binachinabadam-3 emerged to be a tolerant variety and based on root shoot characters, Dacca-1 appeared as tolerant while Zhingabadam always performed as sensitive variety. Salinity treatments had most adverse effects at flowering stage and followed the trend of sensitivity as flowering stage > vegetative stage> pre sowing stage > pod filling stage. All varieties were found to be tolerant up to salinity level of 7.5 dS/m.

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“…In numerous African countries, however, rice production is still not sufficient and the estimated rice import in Africa accounts for several millions of tones each year which represent more than one-fourth of its requirements (Nhamo et al, 2014). There is consequently an urgent need to increase rice production, especially considering that the world"s population is predicted to reach around 10 billion people by 2050 (Hoang et al, 2016). Because of a very limited potential for future expansion of arable lands, such a goal implies to extend rice culture to marginal lands which are not used at the moment for rice culture.…”

Section: Introductionmentioning

confidence: 99%

“…Rice is very sensitive to salt stress (Hoang et al, 2016) and a NaCl dose as low as 50 mM in nutrient solution is considered to be lethal for salt-sensitive cultivars (Yeo and Flowers, 1986;Zhu et al, 2001). Salt-sensitivity in rice varies depending on the phenological stage with young seedlings and plants at the flowering stages being considered as the most sensitive ones (Lutts et al, 1995;Hakim et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Screening for salinity tolerance of Oryza glaberrima Steud. seedlings

Prodjinoto¹,

Gandonou²,

Lutts³

2018

Afr. J. Agric. Res.

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Rice (Oryza sativa) is a salt-sensitive species and improvement of salt resistance is a major goal for plant breeders. Some species of Oryza genus may constitute an interesting source of genes involved in stress resistance for cultivated rice improvement. The African rice Oryza glaberrima is poorly described for its response to salt stress. Twenty-five accessions of O. glaberrima were exposed during 2 weeks to 0 or 60 mM NaCl in nutrient solution. Morphological and physiological parameters were recorded and used to perform principal component analysis allowing us to consider three contrasting groups (saltresistant, medium, and salt-sensitive). Most of the tested lines appeared more salt-sensitive than the moderately salt-resistant cultivar I Kong Pao from O. sativa. Salt-sensitivity index was higher for roots than for shoots and O. glaberrima was poorly efficient for regulation of Na + translocation from the root to the shoot. Some accessions such as TOG5307 however were able to maintain a high net photosynthesis under salt conditions and exhibited a high level of tolerance to accumulated Na + ions and a high capacity for osmotic adjustment. It is concluded that these salt-tolerant accessions constitute a promising material for rice improvement through inter-specific crosses with O. sativa.

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Improvement of Salinity Stress Tolerance in Rice: Challenges and Opportunities

Cited by 190 publications

References 163 publications

Selection for salinity tolerance in an international rice collection at vegetative stage

Selection for salinity tolerance in an international rice collection at vegetative stage

Morphophysiological and yield attributes of groundnut varieties under different salinity stress conditions

Screening for salinity tolerance of Oryza glaberrima Steud. seedlings

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