Uptake and translocation of nano/microplastics by rice seedlings: evidence from a hydroponic experiment

2021 ◽  
pp. 126700
Author(s):  
Yingying Liu ◽  
Rong Guo ◽  
Shuwu Zhang ◽  
Yuhuan Sun ◽  
Fayuan Wang
Keyword(s):  
Rice Seedlings ◽  
Hydroponic Experiment

scholarly journals Genotypic dependent effect of exogenous glutathione on Cd-induced changes in cadmium and mineral uptake and accumulation in rice seedlings (Oryza sativa)

2010 ◽  
Vol 56 (No. 11) ◽  
pp. 516-525 ◽  
Author(s):  
Y. Cai ◽  
L. Lin ◽  
W. Cheng ◽  
G. Zhang ◽  
F. Wu
Keyword(s):  
Chlorophyll A ◽  
Cd Stress ◽  
Rice Seedlings ◽  
Mineral Concentration ◽  
Cd Uptake ◽  
Hydroponic Experiment ◽  
Chlorophyll A And B ◽  
The Difference ◽  
Induced Changes ◽  
Mn Concentrations

A hydroponic experiment was performed using Cd-sensitive (cv. Xiushui63) and tolerant (cv. Bing97252) rice cultivars to evaluate the difference in their response to Cd toxicity in the presence of exogenous glutathione (GSH). The results showed that Cd stress (5 and 50 μmol/l Cd) decreased plant fresh weight, contents of chlorophyll a, b and carotenoids, with Cd-sensitive genotype being more severely affected. Cd significantly decreased concentration and accumulation of Mn in roots/shoots, and Zn in shoots, but increased Cu concentration in roots/shoots. There was a significantly negative correlation between shoot Zn concentrations and shoot/root Cd concentrations, and between root Cd and Mn concentrations. Exogenous GSH significantly alleviated Cd-induced growth inhibition and markedly reduced Cd uptake in both genotypes. In addition, GSH induced a Cd-dose- and genotype-dependent effects on Cd-induced changes in mineral concentration/accumulation and chlorophyll content in rice seedlings. GSH alleviated Cd-induced decrease in root/shoot Zn and Ca concentrations and accumulation of Xiushui 63, while increased root Ca and Mn concentrations in Bing 97252 under 5 µmol/l Cd stress. In addition, GSH also significantly enhanced chlorophyll a and b contents of Bing 97252 in both 5 and 50 µmol/l Cd, and Xiushui 63 in 50 µmol Cd.

scholarly journals Growth Response of Hydroponic Rice Seedlings at Elevated Concentrations of Potassium Chloride

1970 ◽  
Vol 6 (1) ◽  
pp. 55-61 ◽  
Author(s):  
MR Shaibur ◽  
AHM Shamim ◽  
S Kawai
Keyword(s):  
Potassium Chloride ◽  
Growth Response ◽  
Oryza Sativa L ◽  
Dry Weight ◽  
Rice Seedlings ◽  
Shoot Height ◽  
Shoot Dry Weight ◽  
Hydroponic Experiment ◽  
P Concentration ◽  
Highly Sensitive

 A hydroponic experiment was conducted in the greenhouse to observe the effect of potassium chloride (KCl) on growth, macro elements and sodium (Na) concentration of rice seedlings (Oryza sativa L. cv. Hitomebore). The plants were grown up to 14 days after treatments (DAT) treated with 0, 10, 20 and 30 mM KCl. Shoot dry weight (dw) decreased significantly in the 10 mM KCl treatment, indicated that rice seedlings were highly sensitive (glycophytes) to KCl. However, root dw increased in the 10 mM KCl treatment as compared to other treatments, indicated that KCl could enhance root dw at lower concentration. The result indicated that the shoot of rice seedlings was highly sensitive to KCl than that of root. Shoot height, root length and leaf number decreased significantly in the 20 and 30 mM KCl treatments, while the width of leaf blade decreased significantly only in the 30 mM KCl treatment. Considering 10% dw reduction the critical toxicity levels (CTL) of K in shoot was 60.4 mg g-1 dw and 23.3 mg g-1 dw in root. Potassium chloride decreased calcium (Ca), magnesium (Mg) and Na concentrations both in shoot and root, indicated that K had antagonistic relationships with Ca, Mg and Na in rice seedlings. Phosphorus (P) concentration decreased in shoot in the 30 mM KCl treatment indicated that the toxic effete of KCl on P. Potassium concentrations increased in shoot and root with the increasing KCl concentrations in the nutrient solution. The sensitivity response of the elements in rice was Na>Mg>Ca>P under elevated concentrations of KCl. Key words: Calcium, hydroponic, magnesium, potassium, potassium chloride, rice, sodium. doi:10.3329/jard.v6i1.1656 J Agric Rural Dev 6(1&2), 43-53, June 2008

Distribution of phenolic compounds in rice seedlings under Cr ex- posure

2017 ◽  
Vol 2 (2) ◽  
pp. 29-36
Author(s):  
Xiao-Zhang Yu ◽  
◽  
Fei-Fei Zhang ◽  
Keyword(s):  
Phenolic Compounds ◽  
Rice Seedlings

scholarly journals Silicon Stimulates Plant Growth and Metabolism in Rice Plants under Conventional and Osmotic Stress Conditions

Plants ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 777
Author(s):  
Sara Monzerrat Ramírez-Olvera ◽  
Libia Iris Trejo-Téllez ◽  
Fernando Carlos Gómez-Merino ◽  
Lucero del Mar Ruíz-Posadas ◽  
Ernesto Gabriel Alcántar-González ◽  
...  
Keyword(s):  
Plant Growth ◽  
Osmotic Stress ◽  
Abiotic Factors ◽  
Stress Conditions ◽  
Chlorophyll B ◽  
Rice Seedlings ◽  
Root Volume ◽  
Total Sugars ◽  
Dry Biomass ◽  
Peg 8000

Exogenous silicon (Si) can enhance plant resistance to various abiotic factors causing osmotic stress. The objective of this research was to evaluate the application of 1 and 2 mM Si to plants under normal conditions and under osmotic stress. Morelos A-98 rice seedlings, were treated with 1 and 2 mM SiO2 for 28 d. Subsequently, half of the plants were subjected to osmotic stress with the addition of 10% polyethylene glycol (PEG) 8000; and continued with the addition of Si (0, 1 and 2 mM SiO2) for both conditions. The application of Si under both conditions increased chlorophyll b in leaves, root volume, as well as fresh and dry biomass of roots. Interestingly, the number of tillers, shoot fresh and dry biomass, shoot water content, concentration of total chlorophyll, chlorophyll a/b ratio, and the concentration of total sugars and proline in shoot increased with the addition of Si under osmotic stress conditions. The addition of Si under normal conditions decreased the concentration of sugars in the roots, K and Mn in roots, and increased the concentration of Fe and Zn in shoots. Therefore, Si can be used as a potent inorganic biostimulant in rice Morelos A-98 since it stimulates plant growth and modulates the concentration of vital biomolecules and essential nutrients.

scholarly journals The growth response of rice (Oryza sativa L. var. FARO 44) in vitro after inoculation with bacterial isolates from a typical ferruginous ultisol

2021 ◽  
Vol 45 (1) ◽  
Author(s):  
Musa Saheed Ibrahim ◽  
Beckley Ikhajiagbe
Keyword(s):  
16S Rrna ◽  
Bacillus Cereus ◽  
Proteus Mirabilis ◽  
Growth Response ◽  
Gene Sequencing ◽  
16S Rrna Gene Sequencing ◽  
Rrna Gene ◽  
Rice Seedlings ◽  
Rrna Gene Sequencing

Abstract Background Rice forms a significant portion of food consumed in most household worldwide. Rice production has been hampered by soil factors such as ferruginousity which has limited phosphorus availability; an important mineral component for the growth and yield of rice. The presence of phosphate-solubilizing bacteria (PSB) in soils has been reported to enhance phosphate availability. In view of this, the present study employed three bacteria species (BCAC2, EMBF2 and BCAF1) that were previously isolated and proved P solubilization capacities as inocula to investigate the growth response of rice germinants in an in vitro setup. The bacteria isolates were first identified using 16S rRNA gene sequencing and then applied as inoculum. The inolula were prepared in three concentrations (10, 7.5 and 5.0 ml) following McFarland standard. Viable rice (var. FARO 44) seeds were sown in petri dishes and then inoculated with the three inocula at the different concentrations. The setup was studied for 28 days. Results 16S rRNA gene sequencing identified the isolates as: isolate BCAC2= Bacillus cereus strain GGBSU-1, isolate BCAF1= Proteus mirabilis strain TL14-1 and isolate EMBF2= Klebsiella variicola strain AUH-KAM-9. Significant improvement in rice germination, morphology, physiology and biomass parameters in the bacteria-inoculated setups was observed compared to the control. Germination percentage after 4 days was 100 % in the inoculated rice germinants compared to 65% in the control (NiS). Similarly, inoculation with the test isolates enhanced water-use efficiency by over 40%. The rice seedlings inoculated with Bacillus cereus strain GGBSU-1 (BiS) showed no signs of chlorosis and necrosis throughout the study period as against those inoculated with Proteus mirabilis strain TL14-1 (PiS) and Klebsiella variicola strain AUH-KAM-9 (KiS). Significant increase in chlorophyll-a, chlorophyll-b and alpha amylase was observed in the rice seedlings inoculated with BiS as against the NiS. Conclusion Inoculating rice seeds with Bacillus cereus strain GGBSU-1, Proteus mirabilis strain TL14-1 and Klebsiella variicola strain AUH-KAM-9 in an in vitro media significantly improved growth parameters of the test plant. Bacillus cereus strain GGBSU-1 showed higher efficiency due to a more improved growth properties observed.

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