Early growth of caroá (Neoglaziovia variegata) inoculated with plant growth promoting bacteria in different substrates
The aim of this study was to evaluate the combined effect of different substrates and inoculation with Burkholderia silvatlantica strain 103, Serratia marcescens strain 22 and Herbaspirillum seropedicae strain HRC 54, on the early growth of the bromeliad Neoglaziovia variegata. An initial experiment used substrates [commercial substrate Plantmax® (CS) + sand (S); CS + loofah fiber (LF); sphagnum moss (SM); coconut fiber (CF) + LF] with and without inoculation with plant growth-promoting bacteria (PGPB) with 3 replications and 70 seeds plot-1. A second experiment involved substrates (CS+S; SM; and CF) and PGPB (with and without), with three replications and 20 seedlings plot-1. In Experiment 1, the mean values of plant emergence did not differ statistically. Substrate affected emergence speed index (ESI): ESI was higher in SM than in CS+LF and CS+S. Sphagnum moss and CF+LF enhanced H as compared to CS+S. Inoculation led to highest rosette diameters (RD) in plants from both CS+S and CS+LF, whereas the inoculated plants in CF+LF had the lowest RD. Inoculated plants had the highest fresh weight (FW) in CS+S and CS+LF; but the smallest FWRSQUOs were recorded in CF+LF. In Experiment 2, plants in CF had the lowest heights. The number of leaves plant-1 in CS+S and in SM did not differ, but were higher than those of plants from the other substrates; inoculation of PGPB increased the root dry weight (RDW). Inoculated plants grown in CF had highest leaf lengths, which, nevertheless, did not differ from those of non-inoculated plants grown in CS+S. Highest shoot (SV) and root volumes (RV) were observed in non-inoculated plants grown in CF. The substrates CF+LF and SM either with or without inoculation with PGPB showed the best results for the emergence of Neoglaziovia variegata; and SM and CS+S without inoculation showed best results for the initial growth of the seedlings.
Jasmim, J.M., Manhães, N.E., Olivares, F.L. and de Castro, B.B. 2017. Early growth of caroá (Neoglaziovia variegata) inoculated with plant growth promoting bacteria in different substrates. Acta Hort. (ISHS) 1168:47-54
diazotrophic bacteria, Herbaspirillum seropedicae, Loofah cylindrica, coconut fiber