Effect of phosphate solubilizing bacteria from rhizosphere soil of Phaseolus lathyroides L. on growth waxy corn
Keywords:
Phosphate solubilizing bacteria, Plant growth promoting rhizobacteria, Chlorophyll content, Phosphorus concentrationAbstract
This study aimed to isolate the phosphate solubilizing bacteria (PSB) from rhizosphere of Phaseolus lathyroides L. and to study the effect of PSB on waxy corn growth. Thirty-nine isolates of rhizosphere bacteria were obtained from P. lathyroides and 12.82% (n = 5) of them able to solubilize phosphate on PVK agar. The phosphate solubilization efficiency presented in the range of 1.07 ± 0.17 to 1.41 ± 0.19, isolate PHA25 showed the highest phosphate solubilizing efficiency followed by PHA38 PHA17 PHA31 and PHA3, respectively. Then, the growth characteristics of waxy corn were evaluated after the seeds were soaked in PSB suspension of PHA17 PHA25 and PHA38. After 7 days of planting, isolate PHA25 significantly promoted the growth of waxy corn including root fresh weight and longest root length compared to untreated control at P<0.05; moreover, it increased root fresh weight, shoot length, longest root length and total root length for 13.33 10.24 47.5 and 33.99%, respectively. For chlorophyll content in the waxy corn leaf at 28 days, isolate PHA38 significantly (P<0.01) stimulated the highest photosynthesis for 40.79 and 30.67% compared to untreated control and adding chemical fertilizer, respectively. However, the highest of phosphorus concentration in whole shoot of waxy corn was highest in adding chemical fertilizer treatment, followed by soaking in PHA38 suspension which was increased for 56.25% compared to untreated control.
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