Banca de DEFESA: ALEX PAULO LEMOS DA SILVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ALEX PAULO LEMOS DA SILVA
DATE: 30/08/2022
TIME: 09:00
LOCAL: Departamento de Solos da UFRRJ
TITLE:

Initial growth of genotypes belonging to the Saccharum Complex to the inoculation of the diazotrophic bacterium Nitrospirillum amazonense

KEY WORDS:

Nitrogen. Poaceae. Saccharum. Bacteria

PAGES: 60
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Ciência do Solo
SPECIALTY: Microbiologia e Bioquímica do Solo
SUMMARY:

The production of sugar and alcohol in Brazil comes from the planting of hybrids from the crossing of species belonging to the Saccharum Complex. These genotypes, used for crossing commercial sugarcane hybrids, can also play an important role in the generation of energy and biofuels. However, little is known about the growth response when inoculated with the diazotrophic bacteria strain Nitrospirillum amazonense currently recommended in Brazil as an inoculant for sugarcane. This work aimed to evaluate the initial growth of 12 sugarcane genotypes inoculated or not with a strain of this species. The genotypes tested were: Miscanthus Figi 10; S. arundinaceus IJ76-364; S. officinarum IJ76470, Hinahina; the hybrid RB791011; S. robustum US760414; S. spontaneum US76-1319, Arundinoid B, CPDAU849678, NG77-042, NG77-122; and Sacharum sp. Q45416. Two experiments were carried out in a greenhouse in a randomized block design with or without bacterial inoculation and six replications. Pots containing 3 kg in sand:soil substrate sieved in the proportion of 2:1 (v/v) containing two plants each. Inoculation was carried out by immersion of seedlings in a solution diluted in distilled water 1:100 (v/v) of the inoculant immobilized in peat for 30 minutes before planting. The control treatment was immersed in distilled water during the inoculation time. The experiments were evaluated weekly regarding the number of leaves, diameter, and length of the shoot. At 45 days and 109 days, one plant per pot was collected and the tillering, leaf area and fresh and dry mass of roots and aerial plant tissue were evaluated. Analysis of macro elements and 15N content in the different parts including the remained bud were performed at the final harvest. These parameters were submitted to analysis of variance and mean separation using F test (p < 0.05%). Using biometric parameters and biomass accumulation it was observed that the initial growth was higher in plants inoculated in nine genotypes, two did not respond to application and only one genotype reduced growth. Among the evaluated species, the six genotypes of S. spontaneum responded positively to inoculation and the opposite occurred with S. officinarum, where only one genotype responded positively and in only two parameters. The Sacharum sp genotype, Q45416, reduced the growth upon inoculation. The fresh and dry mass at the end of the trial showed another response profile, being positive only for the genotype US76-1319, CPDau 849678 and NG77-122, all belonging to the species S. spontaneum and Miscanthus Figi 10, being negative for Q45416. In relation to the macronutrient’s accumulation, phosphorus showed different responses upon inoculation followed by calcium.   

 

BANKING MEMBERS:
Presidente - ***.052.847-** - VERONICA MASSENA REIS - EMBRAPA
Interno - ***.282.827-** - BRUNO JOSÉ RODRIGUES ALVES - EMBRAPA
Interno - 2626406 - LEANDRO AZEVEDO SANTOS
Externo à Instituição - RAUL CASTRO CARRIELLO ROSA - EMBRAPA