Agriculture Reference
In-Depth Information
Chapter 9
Phosphate-Solubilizing Bacteria Improves
Nutrient Uptake in Aerobic Rice
Radziah Othman and Qurban Ali Panhwar
Abstract Phosphate-solubilizing bacteria (PSB) are frequently used in agriculture
as plant growth promoters because they provide soluble P to growing plants by
solubilizing complex soil inorganic phosphates like Al-P, Fe-P, and Ca-P. Several
PSB strains isolated from local aerobic rice are able to solubilize P from insoluble P
through production of organic acids, for example, oxalic, malic, succinic, and
propionic acids. Hence, the application of PSB plays a vital role in supplying P to
growing plants. The application of PSB strains in this study solubilized higher P
from the soil and significantly enhanced plant uptake in aerobic rice. Besides
possessing P-solubilizing activity, PSB has greater potential to produce phytohor-
mones, for example, indoleacetic acid, and enzymes like phosphatase and phytases.
The continuous supply of soluble P to soil P pool and phytohormones in the root
environment have resulted in the increased P uptake and consequently improved the
growth of aerobic rice. The impact of PSB on aerobic rice is highlighted in this
chapter.
Keywords Phosphate-solubilizing bacteria • Aerobic rice • Phosphatase enzymes
• Organic acids • Phytohormones • P solubilization
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