The Effect of Coating with Pseudomonas fluorescens and Gibberellic Acid on the Quality and Germination Properties of Parsley Seeds (Petroselinum crispum)

In addition to plant growth enhancing bacteria, the effect of gibberellic acid on increasing the ability of germination and seedling vigor index has been investigated and confirmed. To determine the best treatments for coating along with Enterobacter cloacae+Pseudomonas fluorescens and gibberellic acid on germination characteristics and establishment of parsley seed, three experiments were conducted in the seed laboratory of Yasouj University in 2015 and 2016. The first experiment was conducted based on a CRD design on non-primed seeds to select the most suitable coating materials for covering parsley seeds with 4 pelleting treatments including control, vermiculite (V), perlite (P) and kaolin (K). To determine the most suitable combination of coating material, biopriming and hormone priming for seed coating, the second experiment was conducted in a factorial experiment based on a completely randomized design with 12 treatments and 4 replications. The treatments of the second experiment were also used in the third experiment in the greenhouse condition. The best treatments for the first experiments were P20K10 (perlite with a weight ratio of 20 and kaolin 10), P20K20V5 (perlite with a weight ratio of 20, kaolin 20 and vermiculite 5) and P30K10 and in the second experiment were P20K10-GA3-50ppm-6h and also P20K20V5-GA3-50ppm-12h. Finally, in the greenhouse experiment, the use of P20K10-GA3-50ppm-6h treatment was determined as the best treatment to increase the percentage of final field emergence and field emergence rate. The results of this study showed that the use of P20K10-GA3-50ppm-6, other than increasing the volume and physical characteristics, can be useful as a strategy to improve the quality of germination and seedling of parsley.