Microrganismos indutores de crescimento no desempenho de plantas de arroz irrigado tropical
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2019-02-28
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Universidade Federal de Goiás
Resumo
Rice is a staple food for the half of world population. It is rich source of carbohydrates,
thus, represent important source of energy for the maintenance of human metabolism,
mainly in underdeveloped and developing countries. Due to the population increases in
rice consuming countries, it is estimated that by 2030 there should be an approximately
20% increase in rice production for supply the demand for this food. Plant growth
promoting rhizobacteria (PGPR) and fungi of genera Trichoderma spp. are beneficial
microorganisms, which, associated to plant species can induce the growth and hence
increase crops production. Therefore, the use of plant growth inducing microorganisms
represents an important alternative to improve vegetable species production and, ensure
food security in a sustainable way. The aim of this work was to determinate the effect of
kinds and forms of application of microorganisms in the agronomic performance of
tropical lowland rice plants. Experiments were carried out in the completely randomized
design (CRD), where, it was evaluated biomass production, physiological characteristics
through gas exchanges, nutrient content in plants and, seedling root length of tropical
lowland rice. The treatments were of six rhizobacteria isolates: BRM32109 e BRM32110
(Bacillus sp.); BRM32111 (Pseudomonas fluorescens); BRM32112 (Pseudomonas sp.);
BRM32113 (Burkholderia pyrrocinia) e BRM32114 (Serratia sp.) and, one pool with four
Trichoderma asperellum isolates (UFRA.T06 + UFRA.T09 + UFRA.T12 + UFRA.T52).
Data were submitted of variance analyses and to means LSD’s test (p≤0.05). To compare
treatments with microorganism and control plants the data were submitted to Dunnett’s test
(p≤0.05). Based on results, it can be inferred that the use of beneficial microorganisms in
tropical lowland rice plants may represent alternative to improve the crop yield. Overall,
the application of beneficial microorganisms improved the performance of tropical lowland
rice plants compared to control plants, through of higher biomass, gas exchange
improvement, uptake nutrients and seedling root length. However, in the different
experiments the behavior of microorganisms differed. It is know that the interaction
between microorganisms and plants is dependent on some specifications, such as,
vegetable specie/cultivar, soil kind, environmental conditions and concentration of
microorganisms on the colonization region. Thus, beside of positive results, there is a need
for further investigations of effect and mainly interaction of these different beneficial
microorganisms in different lowland rice cultivars in field trials.
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SOUSA, I. M. Microrganismos indutores de crescimento no desempenho de plantas de arroz irrigado tropical. 2019. 81 f. Dissertação (Mestrado em Agronomia) - Universidade Federal de Goiás, Goiânia, 2019.