ISSN 2285-5785, ISSN CD-ROM 2285-5793, ISSN ONLINE 2285-5807, ISSN-L 2285-5785
 

RESPONSES OF ACID PHOSPHATASE ACTIVITY ON THE ROOT SURFACE AND RHIZOSPHERIC SOIL OF SOYBEAN PLANTS TO PHOSPHORUS FERTILIZATION AND RHIZOBACTERIA APPLICATION UNDER LOW WATER SUPPLY

Published in Scientific Papers. Series A. Agronomy, Vol. LVIII
Written by Vladimir ROTARU

Plant growth-promoting rhizobacteria (PGPR) are known to influence plant nutrition and growth by various direct orindirect mechanisms. Acid phosphatases (APase) produced by the roots of plants and microorganisms plays animportant role in inorganic phosphate (Pi) acquisition. The present study was undertaken to evaluate the effects ofphosphorus (P) and rhizobacteria suspension of Pseudomonas fluorecens and Azotobacter chroococcum application onroot surface and soil rhizosphere acid phosphatase activities of two soybean (Glycine max. L. Merr.) cultivars. The potexperiment was conducted in a greenhouse under controlled soil moisture conditions and plants were cultivated on soilsandmixture. Bacterial and phosphorus fertilization plants were subjected at flowering stage to temporally droughtconditions (35% WHC) for 12 days. Both soybean cultivars Zodiac and Horboveanca supplied with rhizobacteriashowed significantly (p <0.05) higher root surface acid phosphatase activity than no treated plants irrespective of thesoil water regime. But the activity of acid phosphatase in rhizothere soil under Zodiac was higher than underHorboveanca. Experimental results revealed a significant positive association between acid phosphatase activity in soiland roots with PGPR application, indicating the role of these enzymes in P nutrition of soybean. These results indicatethat the application of rhizobacteria consortium pseudomonas fluorescens and azotobacter chroococcum plays animportant role in modulation of root surface acid phosphatase activity of soybean and these could have a beneficialimpact on P acquisition by possibly mobilizing organic P, but their beneficial effect must be tested under fieldconditions.

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