Articles

Seed biopriming or coating with rhizobacteria on hot pepper (Capsicum annuum L.): its effects on plant growth, yield, and incidence of Phytophthora blight

Article number
1404_66
Pages
491 – 498
Language
English
Abstract
Biopriming and seed coating with rhizobacteria have been developed to overcome Phytophthora blight (PB) in hot peppers.
The disease is caused by Phytophthora capsici, a seed- and soil-borne fungal pathogen.
Effects of seed biopriming and coating on controlling PB (Experiment 1) and improving plant growth (Experiments 1 and 2) and yield (Experiment 2) in the fields were evaluated.
Both experiments were arranged in a one-factor completely randomized design.
Experiment 1, seed treatments consisted of negative control, positive control, seed coating (with sodium alginate 2.5%) plus E1+F2B1 rhizobacteria isolates, seed coating plus ST116B isolate, seed coating plus CM8 isolate, biopriming E1+F2B1 24 h, biopriming ST116B 24 h, biopriming CM8 24 h, biopriming E1+F2B1 48 h, biopriming ST116B 48 h, biopriming CM8 48 h, priming with metalaxyl 800 ppm.
For control, the seeds were not treated with rhizobacteria, and the soil was either not inoculated (negative control) or inoculated with P. capsici (positive control). In experiment 2, seed treatments were done for 24 h.
They were untreated control, hydropriming, metalaxyl priming, priming in potato dextrose broth (PDB), biopriming in PDB plus E1+F2B1, seed coating, and seed coating plus E1+F2B1. All seed treatments were conducted at 20°C and air-dried 24 or 48 h according to the duration of priming at a laminar airflow cabinet.
Experiment 1 revealed that biopriming with rhizobacteria E1+F2B1 and metalaxyl seed priming increased plant growth (plant height and leaf number) compared to negative control 25 days after transplanting.
Seed coating plus ST116B or E1+F2B1 or biopriming plus E1+F2B1 showed a lower incidence of PB disease compared to metalaxyl 17 days after inoculation.
Experiment 2 showed that biopriming with PDB plus E1+F2B1 was the best treatment to improve plant growth and yield in the field.
On the contrary, metalaxyl seed priming was not effective in improving yield.

Publication
Authors
S. Ilyas, I. Madyasari, C. Budiman, D. Manohara
Keywords
metalaxyl, Phytophthora capsici, potato dextrose broth, seed priming, seed-borne pathogen, soil-borne pathogen
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