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- Title
Soil Microorganisms Increase Mobility of Iron to Rice (Oryza sativa L.) Plants.
- Authors
Dandeniya, W. S.; Wijerathna, Y. U. C.; Palihakkara, P. D. B. J.; Mithrasena, Y. J. P. K.
- Abstract
Understanding the mechanisms involved in iron (Fe) toxicity tolerance of rice would help to develop technologies to ensure maximum utilization of affected lands. This study was conducted to investigate whether soil microorganisms affect Fe uptake by rice plant and whether there are any varietal differences in relation to rhizosphere oxidizing powers. Three rice varieties with different Fe toxicity tolerance capacities were selected [BW 267-3 (tolerant), BW 363 (moderately tolerant) and BW 272-6b (susceptible)]. A pot experiment was conducted in a three-factor factorial design; soil with and without microorganisms, three Fe levels (2, 75 and 300 mg/L) and three rice varieties. At 42 days after germination, dry matter yield and total Fe, K and P in shoots were determined. Rhizosphere oxidizing potential of each variety was determined by visualizing oxidizing power of rice roots embedded in a semisolid agar medium containing Fe sulfide. Results indicated that presence of soil microorganisms significantly (p<0.05) reduced dry matter yield but increased Fe uptake of all three varieties. However, in the presence of microorganisms, Fe uptake remained more consistent irrespective of the Fe concentration in growth medium. Root oxidizing power had a positive relationship with Fe toxicity tolerance. The rhizosphere oxidizing potentials were in the order of BW 267-3 > BW 363 > BW272-6b. Plant-microbial interactions on growth and uptake of Fe, K and P were more prominent in BW 363 and BW 272-6b compared to BW 267-3. The results suggest that microorganisms mobilize Fe to rice plants. Further, remarkable differences exist among the rice varieties in root oxidizing power, and plant-microbial interactions depend on the Fe toxicity tolerance.
- Subjects
IRON; TOXICITY testing; SOIL microbiology; RHIZOSPHERE; PLANT-microbe relationships
- Publication
Tropical Agricultural Research, 2022, Vol 33, Issue 1, p29
- ISSN
1016-1422
- Publication type
Article
- DOI
10.4038/tar.v33i1.8449