Germinação e vigor de sementes de arroz inoculadas com bactérias diazotróficas

Abstract

RESUMOObjetivou-se, neste trabalho, avaliar a germinação e o vigor das sementes de arroz inoculadas com bactérias diazotróficas. Foram instalados dois experimentos, sendo que no primeiro o delineamento experimental adotado foi o inteiramente casualizado em esquema fatorial, com dois lotes de sementes arroz da cultivar IC4440 x 10 tratamentos, com quatro repetições. Os tratamentos foram representados pela inoculação com oito estirpes de bactérias diazotróficas (AR1122, M130, BF1358, ZAE94, AR3122, AR2112, CD e BR2113), bem como pelo recobrimento das sementes com a turfa umedecida com o meio de cultivo esterilizado e pelas sementes não inoculadas. No segundo experimento, o delineamento experimental adotado foi o inteiramente casualizado, em esquema fatorial, com dois lotes de sementes recém-colhidas das cultivares IR42 e Zebu Branco x oito tratamentos, com quatro repetições. Os tratamentos foram representados pela inoculação das sementes com seis estirpes de bactérias diazotróficas (BF1358, AR3122, AR1122, ZAE94, M130 e AR2112), bem como pelo recobrimento das sementes com a turfa umedecida com o meio de cultivo esterilizado e pela não realização do procedimento de inoculação. As bactérias AR1122, M130, BF1358, ZAE94 e AR3112 podem ser selecionadas para formular inoculante para sementes de arroz. A inoculação com as bactérias diazotróficas aumenta a velocidade de germinação das sementes das cultivares IR42 e Zebu Branco, com menor contaminação por fungos. Termos para indexação:Oryza sativa, inoculante, bioestimulante. ABSTRACTThe objective of this work was to evaluate the germination and vigour of rice seeds affected by inoculation with diazotrophic bacteria. Two experiments were conduced. In the first one, a completely randomized design with four replications arranged in a factorial scheme (2 lots x 10 treatments) was used. For this, rice seeds of cultivar IC4440 were inoculated with eight strains of diazotrophic (AR1122, M130, BF1358, ZAE94, AR3122, AR2112, CD e BR2113), submitted to coating with peat soil humidified with a sterile medium and not inoculated. In the second study, a completely randomized design with four replications arranged in a factorial scheme (2 lots x 6 treatments) was used. For this, recently harvested seeds of cultivars IR42 and Zebu Branco were inoculated with six strains (BF1358, AR3122, AR1122, ZAE94, M130 e AR2112), submitted to coating with peat soil humidified with a sterile medium and not inoculated. The bacteria AR1122, M130, BF1358, ZAE94 and AR3112 can be selected for inoculation of rice seeds. The inoculation of diazotrophic bacteria increases the speed of germination of rice seeds of cultivars IR42 e Zebu Branco, with low contamination by fungi.

Doses and application methods of Azospirillum brasilense in irrigated upland rice

“…N values in the flag leaf (leaf N) remained always in the range reported by Raij et al (2001) as adequate (27-35 g kg -1 ). Araújo et al (2010) and Goes (2012), evaluating Azospirillum brasilense inoculation in rice seeds, also did not find difference in the number of panicles per m 2 , corroborating the results found in the present study.…”

Seed quality, chlorophyll content index and leaf nitrogen levels in maize inoculated withAzospirillum brasilense

“…Unlike in rice seeds, where it was observed that inoculation with strains of the genus Azospirillum gave a higher emergence speed and less contamination by fungi (ARAÚJO et al, 2010).…”

Physiological performance of rice seeds treated with thiamethoxam or rhizobacteria under different temperatures

“…The remaining samples did not differ statistically from control seeds. Araújo et al (2010), when assessing the germination of rice seeds stored for one year and subsequently inoculated with strains of diazotrophic bacteria, found no positive effect of bacterial isolates, either. Dan et al (2010) also had no positive results for germination and first germination count of soybean seeds treated with thiamethoxam.…”