Effect of Temperature, Iso-Osmotic Concentrations of NaCl and PEG Agents on Germination and Some Seedling Growth Yield Components in Rice (Oryza sativa L.)

Mokhberdoran, Farzad; Kalat, S M Nabavi; Haghighi, R Sadrabadi

doi:10.3923/ajps.2009.409.416

Cited by 12 publications

(8 citation statements)

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“…At the root level, the reduction in cross-section area has been proposed as a trait for increasing root hydraulic conductivity and plant acquisition of water and productivity [41]. Our results agree with those observed in others species such as common name (Chloris gayana) [39], common name (Prosopis strombulifera) [41], common name (Cynodon dactylon) [42] and cotton [43] under salinity and wheat (Triticum aestivum) [3] and rice [38] under water deficit. In our study, the salinity decreased the root cross-section area mainly due to cortex width reduction ( Table 2).…”

Section: Effects Of Stress Conditions On Seedling Growth and Anatomicsupporting

confidence: 90%

“…However, in our study, the inhibition of length was more prominent in aerial parts than in roots, as reported in sunflower [36], common name (Carthamus tinctorius) [37] and canola (Brassica juncea) [3]. For both RL and AL, PEG functioned as a stronger growth inhibitor than NaCl, at isosmotic concentrations as reported in common name [37], durum wheat [33] and common name (Vigna unguiculate) [38]. These results suggest that osmotic dehydration is the main factor affecting Alamo seedling growth.…”

Section: Effects Of Stress Conditions On Seedling Growth and Anatomicsupporting

confidence: 82%

“…At the epidermal level, both stresses increased the thickness of the cuticle, which is an effective mechanism against water loss under stress [59]. However, no changes were induced in either the number or the area of bulliform cells, unlike reports from other species such as Imperata cylindrica [60], Sporobolus arabicus [61] and Aeluropus lagopoides [38] under salinity conditions. Under our NaCl salinity conditions, epidermal salt glands were not observed, which is contrary to the findings in the upland switchgrass Cave-in-Rock cultivar in green house experiments [26].…”

Section: Effects Of Stress Conditions On Seedling Growth and Anatomicmentioning

confidence: 73%

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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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Section: Effects Of Stress Conditions On Seedling Growth and Anatomicsupporting

confidence: 90%

Section: Effects Of Stress Conditions On Seedling Growth and Anatomicsupporting

confidence: 82%

Section: Effects Of Stress Conditions On Seedling Growth and Anatomicmentioning

confidence: 73%

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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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“…It is assumed that the plant reacts to salinity in two stages: (1) the fast osmotic phase, which inhibits the growth of young leaves, and (2) the slow ion phase, which accelerates the aging of mature leaves [11]. In mesophytes with C 3 and C 4 types of photosynthesis, PEG (polyethylene glycol)-induced drought [12,13], like salinity [14,15], had a significant effect on plant growth. The salinity effect on plant photosynthesis depends on the species and the intensity of the salt stress [16,17].…”

Section: Introductionmentioning

confidence: 99%

Threshold Tolerance of New Genotypes of Pennisetum glaucum (L.) R. Br. to Salinity and Drought

et al. 2018

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With continued population growth, increasing staple crop production is necessary. However, in dryland areas, this is negatively affected by various abiotic stresses, such as drought and salinity. The field screening of 10 improved genetic lines of pear millet originating from African dryland areas was conducted based on a set of agrobiological traits (i.e., germination rate, plant density, plant maturity rate, forage, and grain yields) in order to understand plant growth and its yield potential responses under saline environments. Our findings demonstrated that genotype had a significant impact on the accumulation of green biomass (64.4% based on two-way ANOVA), while salinity caused reduction in grain yield value. HHVBC Tall and IP 19586 were selected as the best-performing and high-yielding genotypes. HHVBC Tall is a dual purpose (i.e., forage and grain) line which produced high grain yields on marginal lands, with soil salinization up to electrical conductivity (EC) 6–8 dS m−1 (approximately 60–80 mM NaCl). Meanwhile, IP 19586, grown under similar conditions, showed a rapid accumulation of green biomass with a significant decrease in grain yield. Both lines were tolerant to drought and sensitive to high salinity (above 200 mM NaCl). The threshold salinity of HHVBC Tall calculated at the seedling stage was lower than that of IP 19586. Seedling viability of these lines was affected by oxidative stress and membrane peroxidation, and they had decreased chlorophyll and carotenoid biosynthesis. This study demonstrated that ionic stress is more detrimental for the accumulation of green and dry biomass, in combination with increasing the proline and malonic dialdehyde (MDA) contents of both best-performing pearl millet lines, as compared with osmotic stress.

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“…Observations in several semi-arid areas counsel that stand establishment, notably of cereals like as barley, is commonly very poor. Water stress not solely affects seed germination however additionally will increase the mean germination time in crop plants [8,9]. It's well established that speedy and uniform field emergence is two essential conditions to increase yield, quality and ultimately profits in crops.…”

Section: Introductionmentioning

confidence: 99%

Effect of Pre-treatment of Barley Grain on Germination and Seedling Growth Under Drought Stress

Khafagy¹,

Mohamed²,

Farouk³

et al. 2017

AAS

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Seed priming is currently a wide used commercial process that accelerates the germination rate and improves seedling uniformity in several crops. A laboratory study was conducted to evaluate the effect of grain priming treatments on barley grain germination and seedling growth under drought stress imposed by PEG-6000. The experiment was performed employing a factorial completely randomized block design with four levels of drought stress (0,10,20 and 30% PEG6000) and 14 priming treatments (dry, hydropriming, 5, 10, 15% PEG-6000; 500, 1000, 1500 mg/l KNO 3 ; 25, 50, 75 mg/l thiamin; 50, 100, 150 mg/l sodium metasilicate) with five replications for each treatment. Germination percentage, germination index, energy of germination, mean germination time, seedling vigor, seedling length, 10 seedling fresh and dry weights were measured below the experimental conditions. Variance analysis results (ANOVA) showed extremely significant (p<0.05) variations between treatments in all traits. It had been discovered that increasing PEG concentrations up to 30% significantly decrease germination criteria and seedling growth traits and that priming treatments in most cases significantly increased all germination and seedling parameter. The most effective in this regard was 1000 mg/l potassium nitrate as compared with untreated control treatment. Priming treatments in most cases mitigates PEG effects as a major increase, particularly with 1000 mg/l potassium nitrate. It is concluded that potassium nitrate at 1000 mg/l is helpful to enhance drought tolerance of barley grain germination and seedling growth.

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Effect of Temperature, Iso-Osmotic Concentrations of NaCl and PEG Agents on Germination and Some Seedling Growth Yield Components in Rice (Oryza sativa L.)

Cited by 12 publications

References 50 publications

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

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

Threshold Tolerance of New Genotypes of Pennisetum glaucum (L.) R. Br. to Salinity and Drought

Effect of Pre-treatment of Barley Grain on Germination and Seedling Growth Under Drought Stress

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