Initial development and chemical components of sugarcane under water stress associated with arbuscular mycorrhizal fungi

Abstract

A B S T R A C TThe objective of this study was to evaluate the effects of water stress levels in the soil and a mix (or: a mixed inoculum of four species: Claroideoglomus etunicatum, Gigasporas rosea, Acaulospora longula, Fuscutata heterogama) of arbuscular mycorrhizal fungi (AMF) on initial vegetative growth, fresh and dry biomass production, root colonization, phosphorus, proteins, enzymes and amino acid of the sugarcane variety RB 857515 under greenhouse conditions. The experiment was set in a randomized block design in a 2 x 2 factorial scheme with four treatments (T1 -50% PC -pot capacity, with AMF; T2 -100% PC with AMF; T3 -50% PC without AMF; T4 -100% PC without AMF) with 16 replicates. The water stress level of 50% PC decreased stem diameter and shoot and root fresh weight of sugarcane plants, as well as AMF in the soil and in plant roots. However, AMF and the water stress level of 50% PC, separately or combined, did not affect plant height, number of leaves, dry matter and contents of phosphorus, total soluble proteins, catalase, ascorbate peroxidase, polyphenoloxidase, peroxidase and proline of the sugarcane variety RB857515.Desenvolvimento inicial e componentes químicos da cana-de-açúcar sob estresse hídrico associado a fungos micorrízicos arbusculares R E S U M O Objetivou-se, neste estudo, avaliar os efeitos de níveis de estresse hídrico no solo e um mix (ou: um inóculo misto de quatro espécies: Claroideoglomus etunicatum, Gigasporas rosea, Acaulospora longula, Fuscutata heterogama) dos fungos micorrízicos arbusculares (FMA) no desenvolvimento vegetativo inicial, produção de biomassa fresca e seca, colonização micorrízica, teores de fósforo, proteínas, enzimas e aminoácido da cana-de-açúcar variedade RB 857515, em condições de casa de vegetação. O delineamento estatístico adotado foi blocos ao acaso em esquema fatorial 2 x 2 com 4 tratamentos (T1-50% CP -capacidade do pote com FMA; T2 -100% CP -com FMA; T3 -50% CP sem FMA; T4 -100% CP sem FMA) com 16 repetições. O nível de estresse hídrico de 50% CP diminuiu o diâmetro do colmo, a biomassa fresca da parte aérea e da raiz da cana-de-açúcar, além dos FMA no solo e raiz da planta; entretanto, os FMA e o nível de estresse hídrico de 50% CP, isoladamente ou em conjunto, não afetaram a altura da planta, número de folhas, matéria seca e teores de fósforo, proteínas solúveis totais, catalase, ascarbato peroxidase, polifenoloxidase, peroxidase nem a prolina da cana-de-açúcar variedade RB857515. Key words: mycorrhizal colonization protein prolinePalavras-chave: colonização micorrízica proteínas prolina 1 Engenheira Agrícola. Fortaleza, CE.

Inoculation of arbuscular mycorrhizal fungi on sugarcane varieties in the production of pre-sprouted seedlings

“…The association of arbuscular mycorrhizal fungi did not affect sugarcane in the initial development and in the biochemical components contents, when submitted to associate water stress after 90 days of inoculation (SOUSA et al, 2015).…”

Drought tolerance of the sugar cane varieties during the initial development

“…Therefore, water-deficit tolerant varieties, including those plants with higher dry mass production (Pincelli & Silva, 2012) are better alternatives. Also the ones with greater stalk diameter, under conditions of poor water availability (Sousa et al, 2015), are suitable to minimize the unfavorable effects of the water deficit. This study aims to identify the water deficit-tolerant sugarcane varieties best suited for cultivation in the Cerrado of Mato Grosso, by assessing their biometric characteristics in response to cultivation environments having a water deficit.…”