Isolation and Screening of Zinc Solubilizing Rhizosphere Bacteria and Their Impact on Growth of Vigna unguiculata (Black Eyed Pea Plant)
Keywords:
Zinc as essential trace element, Zinc solubilizing rhizosphere bacteria, Solanum lycopersicum (Tomato), Zea maize (Maize), Sorghum bicolor (Sorgum), Experimental Vigna unguiculata (L.) Walp. (Black eyed pea) Plant, Plant Growth Promoting Rhizosphere (PGPR) Bacteria, BiofertilizerAbstract
Zinc is one of the eight essential trace elements that plants need for normal growth and
reproduction. Plants require Zinc in small but critical concentrations. Zinc is present in soil in
their complex organic form, but plants require their simple ionic form for fulfilling their
requirements. Soil microorganisms play a crucial role in solubilization and mobilization of
this element for plant growth and increase crop yield. In the present investigation, there were
5 Zinc Solubilizing Bacterial isolates (ZnSB) obtained from Solanum lycopersicum (Tomato),
Zea maize (Maize), and Sorghum bicolour (Sorgum) rhizosphere soil samples, using growth
medium supplemented with insoluble source of Zinc such as Zinc oxide (ZnO) 0.1%. All
ZnSB isolates were further tested for their identification up to genus level in VITEK 2
automated microbiology system and results revealed that they all were Bacillus thuringiensis.
They are further investigated for their biochemical activities and effect on Vigna unguiculata
(Black eyed pea) plant’s growth. Experiment revealed that all 5 ZnSB isolates were
promising in exhibiting almost all Plant growth promoting characters. As Plant Growth
Promoting Rhizosphere (PGPR) bactetia are environmental friendly and offer sustainable
approach to increase production of crops and health. Therefore, these isolates can be utilized
for biofertilizer formulation under local agroclimatic conditions which decreases the
application of chemical fertilizers.
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