Abstract

Pseudomonas (P) fluorescens promote plant growth by lowering the endogenous ethylene synthesis in the roots through their 1-aminocylopropane-1-carboxylate-deaminase (ACCD) activity. However, in the environs of the roots may decrease the efficiency of these P. fluorescens by stimulating ACC- oxidase activity resulting in greater ethylene production by the roots. So this study was designed to assess the performance of P. fluorescens containing ACC-deaminase for improving rhizobial population and yield of maize. The results revealed that the rhizobial population, irrespective of treatments, was maximum at 55 days after sowing followed by a reduction at harvest. The treatment T28+pH 7.2 (Temperature 28°C + pH 7.2) enhanced the maximum population of P. fluorescens in rhizoshpere at 35, 55 and 75 days after sowing (DAS) was with 1.69, 1.59 and 1.87 log fold increase over fertilized un-inoculated FUI [(3.7089 log cfu/g = 5.80 x103 cfu g-1 soil), (5.8673 log cfu/g = (7.53x105 cfu g-1 soil) and (4.676 log cfu/g 5.55x104 cfu g-1 soil)]. Similar treatment T28+pH 7.2 recorded maximum number of cob plant-1, cob length-1, number of grains line-1 and number of grains cob-1 at harvest were with T28+pH 7.2 by 30.6, 32.1, 29.7 and 37.7% over the control FUI (2.1, 15.2 cm, 35.0 and 503), respectively. While the treatment T31+pH 7.2 (Temperature 31°C + pH 7.2) enhanced the cob girth and maximum grains line cob-1 at harvest were with 26.0 and 31.3% response over FUI (13.3 cm cob-1 and 13.9), respectively. The treatment T28+pH 7.2 significantly increased the seed and stover yields of maize by 24.9 and 31.6% over the control (2914 and 7133 kg ha-1), respectively.

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