ISOLATION AND SELECTION OF ENDOPHYTIC BACTERIA CAPABLE OF FIXING NITROGEN AND SYNTHESIZING IAA FROM RICE PLANTS (Oryza sativa L.) IN DONG THAP AND LONG AN, VIETNAM
Main Article Content
Abstract
This study aimed to isolate and select endophytic bacteria from rice plants collected in Long An and Dong Thap that can fix nitrogen and synthesize indole-3-acetic acid (IAA), a plant growth-promoting substance. Subsequent screening identified 9 strains with nitrogen-fixing capabilities, producing ammonia levels ranging from 131.31 to 371.57 µg/mL, and 12 strains capable of synthesizing IAA, producing IAA levels ranging from 24.548 to 75.596 µg/mL. The two strains with the highest nitrogen fixation and IAA synthesis abilities were selected: strain LV5-L1 and strain LV1-R1. Investigating the effects of the selected microorganisms on rice growth, strains LV5-L1 and LV1-R1 showed the highest growth indicators. Strain LV5-L1 exhibited a stem length of 22.93 cm, a root length of 7.67 cm, a root number of 9.67, a chlorophyll a content of 10.87 µg/ml, and a chlorophyll b content of 5.5994 µg/ml. Strain LV1-R1 showed a stem length of 21.63 cm, a root length of 7.10 cm, a root number of 10, a chlorophyll a content of 10.77 µg/ml, and a chlorophyll b content of 5.349 µg/ml. Using molecular biology techniques, strain LV5-L1 was identified as having 98.35% similarity to Bacillus subtilis, demonstrated the highest nitrogen-fixing ability, and produced the greatest overall plant growth. Meanwhile, strain LV1-R1 was identified as having 100% similarity to Paenibacillus provencensis, exhibited the highest IAA synthesis, and significantly increased
root number.
Keywords
Endophytic bacteria, IAA synthesis, Nitrogen fixation, Rice plant
Article Details
References
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