Banca de DEFESA: ROMARIO GUIMARAES VERCOSA DE ARAUJO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ROMARIO GUIMARAES VERCOSA DE ARAUJO
DATE: 06/07/2021
TIME: 14:00
LOCAL: CECA- UFAL, ambiente virtual.
TITLE:

INDUCTION OF RESISTANCE TO Colletotrichum truncatum IN Phaseolus lunatus BY NITROGEN-FIXING BACTERIA

KEY WORDS:

biological control; biological nitrogen fixation; anthracnose; innate resistance; pulses.

PAGES: 62
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Fitossanidade
SPECIALTY: Microbiologia Agrícola
SUMMARY:

Plant defense mechanisms are activated when challenged with the causative agent of the disease. Induced defense processes can be of two types: acquired systemic resistance (SAR) and induced systemic resistance (ISR). SAR is activated by biotic and abiotic factors and ISR is activated by microorganisms present in the rhizosphere. Nitrogen-fixing bacteria are symbionts of the roots that supply nitrogen to legumes. The interaction involves the suppression of the plant's defense system, but there are reports of effects associated with the induction of resistance to some pathogens. Thus, the objective was to evaluate the contribution of symbiosis in the resistance of P. lunatus to anthracnose. Species of nitrogen-fixing bacteria were isolated from nodules obtained from spontaneous infection of 19 P. lunatus genotypes. The isolated bacteria were morphologically characterized. Two rhizobial strains were selected, one with high nodule potential (CECA R19) and one with low nodule capacity (CECA R01). The bacterial isolates were inoculated into 4 broad bean genotypes with the following characteristics: F1CGG (high nodulation rate and resistant to anthracnose); RTKC (high nodulation rate and susceptible to anthracnose); PCGG (low nodulation rate and resistant to anthracnose); FFG (low nodulation rate and susceptible to anthracnose) and compared with the control treatment and the treatment where mineral nitrogen was supplied (corresponding to 50 kg ha-1 of N). It was found that plants inoculated with isolates CECA R01, CECA R19 and plants fertilized with mineral nitrogen showed less severity of anthracnose symptoms at 3 and 5 days after inoculation, in addition to presenting higher biomass and dry matter of the aerial part when compared to the control treatment. At the end of the evaluation, the plants fertilized with mineral nitrogen and those inoculated with the strains CECA R01 CECA R19 were classified as moderately resistant and the plants of the control treatment as moderately susceptible.

BANKING MEMBERS:
Presidente - 1790557 - GILDEMBERG AMORIM LEAL JUNIOR
Interna - 1121083 - MARIA DE FATIMA SILVA MUNIZ
Externa ao Programa - 1121109 - TANIA MARTA CARVALHO DOS SANTOS