MADRAS AGRICULTURAL JOURNAL

Impact of drought-tolerant rice apoplastic fluid endophyte (Sphingobium yanoikuyae MH394206) on the morphological and physiological characteristics of rice (CO51) grown in moisture deficit condition

Abstract

                               A pot culture study was conducted to evaluate the effect of rice apoplastic fluid ACCD (aminocyclopropane-1 carboxylate deaminase)containing endophyte, Sphingobium yanoikuyae MH394206 on moisture stress alleviating potential in rice (CO51). Impact of this organism was compared with plant growth promoting bacterial inoculants such as Methylorubrum sp, (pink pigmented facultative methylotroph-PPFM) and Bacillus altitudinis FD48. The effect was assessed in terms of changes in growth and morpho-physiological characteristics of rice grown in 75% moisture stress. Seed application of these bacterial cultures enhanced plant growth and stress-related parameters like total phenolic content, proline accumulation and activity of antioxidant enzymes such as peroxidase (PO), catalase (CAT) and polyphenol oxidase (PPO) compared to uninoculated moisture stressed control. The effect was more significant (P>0.05%) due to Sphingobium yanoikuyae MH394206. Further studies are needed to find out the mechanism of plant growth promotion under stress by Sphingobium yanoikuyae MH394206.

Key words : Moisture stress, Sphingobium yanoikuyae, relative water content, antioxidant enzymes

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performed better than 0.50 degree in all microphysics schemes considered for the study. Among the three microphysics options, the Kessler scheme had higher rainfall forecast accuracy than WSM 3 class scheme and WSM 6 class scheme. Root mean square error was also low in Kessler scheme compared to other two schemes. Kessler scheme produced highly usable forecast than WSM 3 and 6 class schemes. Hence, it is concluded that the Kessler scheme with 0.25o input data resolution produced higher rainfall forecast accuracy for Tamil Nadu region

Key words : :Weatherforecast, WRF, Microphysics,Accuracy, Verification

Copyright @ 2019 Madras Agricultural Journal | Developed by Crystalpro All right reserved.

MADRAS AGRICULTURAL JOURNAL

Biosorption of Chromium (III) from Aqueous Solution by Water Hyacinth Biomass

Abstract

                                Release of heavy metals into the environment is a matter of global concern for the past few years and it should be removed from industrial waste waters before discharge for maintaining water quality standards. This study involved the use of water hyacinth biomass as biosorbent for removal of Cr(III) from aqueous solution. The biosorbent was characterized by FTIR, SEM with EDAX. Batch experiments were conducted to determine the sorption isotherms, effect of solution pH, adsorbate concentration, contact time, biosorbent dosage and size. The results confirmed that water hyacinth biomass can remove Cr(III) from aqueous solution. The maximum sorption occurs at pH =5.0, biosorbent size= 0.2mm, biosorbent dosage=2.0g 100ml-1 of adsorbate, adsorbate / solute concentration= 100 mg L-1 Cr(III) at 25ºC at 250 rpm after 24 hrs. The rate of adsorption was rapid and equilibrium attained at 24hrs. Langmuir, Freundlich and Temkin isotherm models were used to analyze the equilibrium adsorption data. Langmuir isotherm fitted the data well with R2 value of 0.999. Overall, the powdered water hyacinth biomass could be utilized as effective low cost adsorbent for the removal of Cr(III) from waste water.

Key words : Adsorption, Cr Removal, Release kinetics, Water hyacinth

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    Copyright @ 2019 Madras Agricultural Journal | Developed by Crystalpro All right reserved.