Lettuce variety- PGPR [plant growth promoting rhizobacteria] interaction under SNAP hydroponics system
2008
Delfin, E.F., Philippines Univ. Los Banos, College, Laguna (Philippines). Inst. of Plant Breeding. Crop Science Cluster | Paterno, E.S., Philippines Univ. Los Banos, College, Laguna (Philippines). Agricultural Systems Cluster | Fernando, L.M., Philippines Univ. Los Banos, College, Laguna (Philippines). National Inst. of Biotechnology and Molecular Biology | Santos, P.J.A., Philippines Univ. Los Banos, College, Laguna (Philippines). Inst. of Plant Breeding. Crop Science Cluster
Beneficial bacteria present in the plant's rhizosphere were reported to be capable of promoting plant growth and development. This group of bacteria, collectively known as plant growth promoting rhizobacteria (PGPR) improved plant growth through enhanced root development. Two greenhouse experiments were conducted to evaluate the effect of PGPR inoculation on lettuce grown under SNAP hydroponics system. The initial experiment evaluated the response of 5 leaf lettuce varieties to PGPR inoculation. The results showed that in general, inoculation did not significantly increase marketable fresh weight and total leaf area although two varieties, Lollo Bionda and Estrosa showed 23% and 21% increase in marketable fresh weight, respectively. On the other hand, PGPR inoculation reduced the yield of variety Lollo Rosa by 34%. The succeeding experiment further tested the response of both Lollo Bionda and Lollo Rosa together with two other varieties, Denies Green and Grand Rapids to four PGPR formulations developed at BIOTECH, UPLB. Significant host variety-PGPR formulation interaction was obtained in terms of total fresh weight. Inoculation with F1 and F3 formulations significantly increased total fresh weight of Denies Green while inoculation with F2 and F4 did not increase yield significantly. Lollo Bionda, did not show significant response to inoculation with any one of the formulations used although a 24% average yield increase was obtained with inoculation. On the other hand, Lollo Rosa was found to be compatible with F2, F3 and F4 formulations as shown by the 20 to 40% yield reduction obtained from plants inoculated with these formulations. Results stressed the importance of using a compatible variety- PGPR combination to attain the benefit derived from inoculation.
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