The Effects of Cation Ratios on Root Lamella Suberization in Rice (<i>Oryza sativa</i>L.) with Contrasting Salt Tolerance

Momayezi, M. R.; Zaharah, A. R.; Hanafi, Mohamed

doi:10.1155/2012/769196

Cited by 8 publications

(6 citation statements)

References 32 publications

(41 reference statements)

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“…Concerning root to shoot ratios, Momayezi et al (2012) observed that the Fajr rice genotype (salt tolerant) had the highest values for agronomic parameters including root characteristics, root to shoot ratio, dry biomass and water content of roots, in comparison to the Khazar genotype (salt sensitive), and these results are similar to our findings reported herein. Furthermore, Zhang et al (2012) also demonstrated that the salt tolerant rice genotype IR651 showed a root to shoot ratio significantly higher than that of IR64, a moderately tolerant genotype, when plants were exposed to a CE of 9.8 dS m -1 in the soil.…”

Section: Discussionsupporting

confidence: 91%

NAC transcription factor expression, amino acid concentration and growth of elite rice cultivars upon salt stress

2014

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NAC transcription factors (TF) play important roles in regulating osmotic stress tolerance in plants. We tested the expression of 57 NAC genes in the presence of NaCl in young leaves of two elite rice cultivars, Cotaxtla and Tres Ríos, which display contrasting responses to salinity at the biochemical and physiological levels. Using qRT-PCR, the expression of 41 out of 57 NAC genes was validated, of which 23 showed regulation by NaCl. We identified two NAC genes (Os02g56600 and Os12g07790) induced in Cotaxtla, but repressed in Tres Ríos when plants were exposed to 100 mM NaCl in nutrient solution. In both elite cultivars, treated plants showed higher concentrations of total amino acids and proline in comparison to the controls; in all cases, Cotaxtla plants accumulated more free amino acids and proline than Tres Ríos plants. Furthermore, shoot growth was more affected in both cultivars, while root length was not reduced in treated plants in comparison to the controls. We conclude that both elite rice cultivars exhibit different expression patterns of NAC transcription factors as well as biochemical and physiological responses to salt stress, giving rise to better performance of Cotaxtla plants in comparison to Tres Ríos plants under our experimental conditions.

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Section: Discussionsupporting

confidence: 91%

NAC transcription factor expression, amino acid concentration and growth of elite rice cultivars upon salt stress

2014

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“…The remarkable reduction in cross-section area of metaxylem vessels observed in roots of switchgrass seedlings grown under NaCl and PEG stress (Table 2) matched the findings of Akram et al [48] in wheat under salinity stress and in common name [49] under drought. This response could constitute an efficient strategy to transport water by lowering the risk of embolisms (protecting the xylem against cavitation: a critical adaptation because narrow vessels are less prone to damage caused by embolism) and increasing water -flow resistance [50].…”

Section: Effects Of Stress Conditions On Seedling Growth and Anatomicsupporting

confidence: 86%

Morpho-Physiological Responses of Alamo Switchgrass During Germination and Early Seedling Stage Under Salinity or Water Stress Conditions

et al. 2018

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Switchgrass (Panicum virgatum L.) is a warm perennial grass with valuable characteristics as a biofuel crop. To avoid competition with food crops, biofuel crops will be likely relegated to less productive soils such as marginal lands. Consequently, the salinity and water scarcity problems that commonly affect marginal lands, compromise biofuel crops germination, emergence and seedling establishment. The aims of this study were to study the germination and seedling growth of switchgrass under salinity and water stress, and to describe the morpho-anatomical responses of the roots and leaves in the seedlings to these stresses. The effect of salt and water stress was assessed using sodium chloride (NaCl) and polyethylene glycol 8000 (PEG) at the same water potentials of-0.8,-1.0 and-1.2 MPa. Seeds were moist prechilled for 7 days at 5 ºC and germinated at 30ºC/15 ºC (8 h light/16 h dark). NaCl treatments (-0.8 and-1.0 MPa) delayed germination rates but did not reduce the final germination percentage, whereas at a lower potential (-1.2 MPa) the final germination percentage was diminished. The effects of PEG (-1.0 and-1.2 MPa) on the germination rate and final percentage, were more detrimental than those induced by iso-osmotic concentrations of NaCl. PEG and NaCl reduced significantly the vigor index of-0.8 to-1.2 MPa. The morpho-anatomical changes such as the reduction in the root cross-section area and the thickening of the endodermis walls for both stress conditions and aerenchyma formation in the cortex under salinity, could significantly contribute in the survival and tolerance during the early seedling stages.

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“…The capacity to tolerate salinity is a key factor in plant productivity (Momayezi et al, 2009). In the present study, all the rice accessions grew robustly and showed uniform green colour and height in the non-stressed conditions.…”

Section: Discussionsupporting

confidence: 48%

Morphological and molecular screening of rice accessions for salt tolerance

Uyoh¹,

Ntui²,

Umego³

et al. 2019

Afr. J. Biotechnol.

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The ever-increasing demand for rice raises the need to increase productivity by using salt tolerant varieties on saline soils. In this study, 12 rice accessions were screened for tolerance to salt at seedling stage using morphological and molecular methods. The study was carried out in a hydroponic system using Hoagland solution. Scoring was done using the modified standard evaluation score (SES) system after 14 days of treatment. Salt tolerance indices were estimated from shoot length, root length and total biomass. For molecular studies, ten Simple Sequence Repeats (SSR) primers linked with salt tolerance Quantitative Trait Loci (QTL) were used. Results showed greater reductions in biomass and shoot growth of susceptible accessions compared to the tolerant ones. The effect of salt stress on root length showed variability among accessions as well as concentrations. UPIA 1, UPIA 2, FARO 52, FARO 61, TOG 5681 and FARO 44 had similar banding patterns with POKALLI (check variety) suggesting that they may contain salt tolerance genes. Of these accessions, only POKALLI and UPIA 2 survived all levels of salt concentration tested and thus got the highest SES score of one. Both accessions also had the highest overall mean salt tolerance indices. In conclusion, based on SES scores, salt tolerance indices and SSR data, POKALLI and UPIA 2 were identified as highly tolerant, FARO61, FARO 52, UPIA 1 and TOG 5980A as tolerant while WITA 12, CG12, TOG1670, TOG 5681 and TOG 5485 were highly susceptible. Such information will be useful in the selection of parents as breeding lines for salt tolerance.

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The Effects of Cation Ratios on Root Lamella Suberization in Rice (Oryza sativaL.) with Contrasting Salt Tolerance

Cited by 8 publications

References 32 publications

NAC transcription factor expression, amino acid concentration and growth of elite rice cultivars upon salt stress

NAC transcription factor expression, amino acid concentration and growth of elite rice cultivars upon salt stress

Morpho-Physiological Responses of Alamo Switchgrass During Germination and Early Seedling Stage Under Salinity or Water Stress Conditions

Morphological and molecular screening of rice accessions for salt tolerance

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