DIFFERENTIAL EFFECTS OF SOIL MICROBES ON THE GROWTH AND PHOSPHORUS ACQUISITION OF TWO RICE CULTIVARS (AZUCENA AND IAC 25) | ||
| Euphrates Journal of Agriculture Science | ||
| Article 1, Volume 8, Issue 4, December 2016, Pages 33-47 | ||
| Authors | ||
| Alogaidi Faez; Price Adam; Johnson David | ||
| Abstract | ||
| Phosphorus(P) is a finite resource and is a major limiting factor for rice yield on a large area of World’s arable land. P is limited to plants because of its chemical fixation and low solubility leading to P deficiency in most soils. Soil microbial communities exert important control over soil processes and their functions are central to nutrient cycling that determines plant productivity. This study is aimed at understanding interactions between indigenous soil micro-organisms and rice cultivars (Oryza sativa L.) in P limited conditions. Two rice cultivars (Azucena and IAC 25) were grown in either live or sterile soil (5% live or sterile topsoil with 95% P-limited sterile subsoil, plus P free Yoshida’s nutrient solution). Plant growth, P-uptake and P use efficiency (PUE) were assayed at harvest. Results revealed a highly significant (P<0.001) interaction on shoot dry weight (SDW) where Azucena grew better in sterile soil than its live topsoil counterpart. The opposite was observed for IAC 25. This effect was even more pronounced for root growth with the root system of sterile topsoil grown IAC 25 being reduced by more than 60%. This translated into an effect on root/shoot ratio where topsoil sterilisation (no inocula) had little effect on Azucena but in IAC 25 it reduced from 0.35 to 0.21 (P values for both treatment and cultivar effect were less than 0.001). Significant interaction between cultivar and treatment for shoot P concentration and P use efficiency (g shoot dry weight/mg P in shoot) were found. These results suggest that IAC 25 requires the presence of soil microbes to access soil-bound P under P-limiting condition while Azucena does not. | ||
| Keywords | ||
| Oryza sativa; Phosphorus acquisition; soil microbes; Shoot dry weight | ||
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