Response of seed priming treatment inoculated by PGPR in root growth of tomato (Solanum lycopersicum L.) Muhammad Yusril Hardiansyah (a,b*), Miguelito Fajardo Isip (a,c), Azmi Nur Karimah Amas (d), Fahmi Sahaka (d), Yunus Musa (b,d)
a) Global Agriculture Technology and Genomic Science, International College, National Taiwan University, Taipei 10617, Republic of China, Taiwan
*yusrilhardiansyah1[at]gmail.com
b) Department of Agronomy, Agrotechnology Study Program, Faculty of Agriculture, Universitas Hasanuddin, Makassar 90245, Indonesia
c) Institute for Climate Change and Environmental Management, Central Luzon State University, Science City of Munoz, Nueva Ecija 3102, The Philippines
d) Program of Agrotechnology, Graduate School, Universitas Hasanuddin, Makassar 90245, South Sulawesi, Indonesia
Abstract
Plant growth-promoting rhizobacteria (PGPR) are the rhizosphere bacteria that can effect to plant growth initially by a wide variety of mechanisms like phosphate solubilization, siderophore production, biological nitrogen fixation, etc. PGPR can enhance the plant roles of metabolism and physiological case. PGPR can modulate root development and growth through the production of phytohormones, secondary metabolites and enzymes. The most commonly observed effects are a reduction of the growth rate of primary root, and an increase of the number and length of lateral roots and root hairs. The objective for this research is to elucidate whether PGPR can affect in tomato roots specific to growth and developmental stages. By using PGPR which was colonized from the bamboo rhizosphere, PGPR was also inoculated into the soil during seedling stages of tomato with one to four times inoculation on 7, 14, 21, and 28 days after germination and measured the root observation until 40 days old of tomato. The parameter observations include root length, root wet weight, root dry weight, root branches, and root hairs with three biological replicates. The form of Tukey^s test (one-way ANOVA) with SD was used as statistical analysis. The results shown PGPR was successfully enhanced tomato root length (42.6 cm), root wet weight (0.84 g), root dry weight (0.24 g), number of root branches (23), number of root hairs (120) in average after four times inoculation instead of one to three times and control inoculated. As conclusion, PGPR successfully enhances the root growth of tomato after four times inoculation and PGPR plays an important role in response to root growth and development in tomato.
Keywords: PGPR, root, tomato, growth and development
