MADRAS AGRICULTURAL JOURNAL

Standardization of spore load for AMF inoculation and its effect on rice root colonization and root system architecture in vitro

Abstract

                                Arbuscular Mycorrhizal Fungi (AMF) can form symbiotic relationship with rice, preferably in the modern rice production systems such as System of Rice Intensification (SRI), aerobic and upland conditions. Their association with rice roots under in vitro conditions was investigated in this study. A suspension containing one lakh (1, 00,000) spores of Rhizophagus irregularis was employed to standardize optimum AMF spore load/seedling and evaluate its effect on Root System Architecture (RSA). The results indicated that different spore loads of AMF inoculated with rice seedlings, under in vitro conditions, modified most of the traits of RSA of rice at early stages significantly better than the uninoculated Control. The in vitro study clearly showed that the seedlings of rice with AMF inoculated with a dose of 14 µl/seedling (31 spores/ seedling) recorded maximum root colonization of 100 per cent by AMF in rice.

Key words : AM Fungi, Spore load, Rice (Oryza sativa), RSA, in vitro, Principal Component Analysis (PCA).

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

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

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

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

  • Downloads
  • Views
  • Shares
  • Full Text

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