Gas exchange and leaf area of banana plants under salt stress inoculated with growth-promoting bacteria/Trocas gasosas e area foliar de bananeiras sob estresse salino inoculadas com bacterias promotoras de crescimento.

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Publisher: ATECEL--Associacao Tecnico Cientifica Ernesto Luiz de Oliveira Junior
Document Type: Article
Length: 4,235 words

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Abstract :

HIGHLIGHTS: Banana cv. Prata Catarina has its gas exchange negatively affected by irrigation water salinity. Bacillus sp. did not reduce the harmful effect of salinity on the gas exchange and leaf area of banana. Salinity influences the leaf area similarly to photosynthesis. Banana orchards in arid and semiarid regions require the use of irrigation. However, the presence of high concentration of salts in water can impair the development of plants, requiring the evaluation of new technologies to mitigate the effects of stress. The objective of this study was to evaluate gas exchange and leaf area in banana seedlings of the cultivar Prata Catarina inoculated with strains of Bacillus spp. under different electrical conductivities of irrigation water. The experiment was carried out in a greenhouse at Embrapa Tropical Agroindustry, Fortaleza, Ceara state, Brazil. The design used was in randomized blocks, in a 4 x 4 factorial scheme, with the first factor being the inoculation treatments: without any application; slow-release fertilizer; Strain 186 and Strain 109, and the second factor being the electrical conductivity of irrigation water (0.5; 1.5; 3.0; 4.5 dS [m.sup.1]), in five blocks and each plot consisting of three plants. The electrical conductivity of irrigation water negatively influenced the gas exchange of banana cv. Prata Catarina in the vegetative stage, during the 89 days of cultivation. The Bacillus spp. strains 186 and 109 did not improve the gas exchange and leaf area of plants under salinity conditions. Keywords: Bacillus sp., photosynthetic limitations, growth, salinity Os pomares de banana em regioes aridas e semiaridas requerem o uso de irrigacao. Porem, a presenca de altos teores de sais na agua pode prejudicar o desenvolvimento das plantas, exigindo a busca de tecnologias para amenizar os efeitos do estresse. O objetivo deste estudo foi avaliar as trocas gasosas e area foliar em mudas de bananeira da cultivar Prata Catarina inoculadas com cepas de Bacillus spp. sob diferentes valores de condutividade eletrica da agua de irrigacao. O experimento foi conduzido em casa de vegetacao na Embrapa Agroindustria Tropical, Fortaleza, Ceara, Brasil. O delineamento utilizado foi em blocos casualizados, em esquema fatorial 4x4, sendo o primeiro fator os tratamentos de inoculacao: sem qualquer aplicacao; fertilizante de liberacao lenta; as linhagens 186 e 109 e o segundo fator a condutividade eletrica da agua de irrigacao (0,5; 1,5; 3,0; 4,5 dS [m.sup.1]), em cinco blocos sendo cada parcela constituida por tres plantas. A condutividade eletrica da agua de irrigacao influenciou negativamente as trocas gasosas da bananeira cv. Prata Catarina na fase vegetativa, aos 89 dias de cultivo. Os Bacillus spp. 186 e 109 nao melhoraram as trocas gasosas nem aumentaram a area foliar das plantas em condicoes de salinidade. Palavras-chave: Bacillus sp., limitacoes fotossinteticas, crescimento, salinidade

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Gale Document Number: GALE|A674989397