Banca de DEFESA: ELIENE ARAUJO FERNANDES

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : ELIENE ARAUJO FERNANDES
DATE: 21/03/2025
TIME: 14:00
LOCAL: Sala de aula do PPGF
TITLE:

Response of cowpea cultivars subjected to water restriction

KEY WORDS:

Vigna unguiculata; water deficit; tolerance

PAGES: 42
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Fitotecnia
SPECIALTY: Fisiologia de Plantas Cultivadas
SUMMARY:

Cultivated plants, when exposed to periods of abiotic stress such as water, thermal or osmotic stress, affect growth and development, resulting in reduced productivity. Under drought conditions, plants show physiological, morphological and biochemical changes, with reversible or irreversible effects. These effects depend on the superimposition of other stresses, degree of severity, genotype and stage of crop development. Cowpea is a leguminous plant considered moderately tolerant to water deficiency. The objective of this work is to compare the physiological responses and productivity of cowpea cultivars, EPACE 10, BRS Novaera, Gurguéia, Paulistinha, BRS Pingo de Ouro 1-2 and Semper verde under water restriction, in a greenhouse. The study will be divided and conducted in three stages, the first using two bean genotypes EPACE 10, BRS Novaera, a second with EPACE 10, BRS Novaera, Gurguéia, Paulistinha, and another with EPACE 10, Gurguéia, Paulistinha, BRS Pingo Gold 1-2, in the Phytotechnics sector of the Federal Rural University of Rio de Janeiro (UFRRJ); the design for the experiments will be arranged in a factorial scheme 2x9x3 and 4x9x3 referring to the genotypes, the collections (five during stress, two during the recovery phase and two at harvest) with three replications. For the physiological variables, the water potential, relative water content, protroplasma tolerance, starch and protein contents, soluble sugar and free amino acid contents of the leaves will be evaluated, which will always be evaluated before stress, during stress and during rehydration. In these collections will be evaluated: dry mass dry mass of leaves and leaf area, in addition to the number of nodules, nodule weight and production components. Data will be subjected to analysis of variance and results will be compared and segregated by Student Newman Keus test (p < 0.05) when significant difference is detected. It is expected that the genotypes present desirable characteristics for drought tolerance, such as rapid stomatal closure and maintenance of water potential in the leaf. Therefore, after evaluation in a greenhouse, the genotypes can be indicated for a plant breeding program, aiming at the development of a new cultivar with better drought resistance characteristics through the selected materials.

COMMITTEE MEMBERS:
Presidente - 387258 - CARLOS PIMENTEL
Interno - 1905333 - AROLDO FERREIRA LOPES MACHADO
Interno - 2181674 - LEONARDO OLIVEIRA MEDICI
Externo à Instituição - JEAN LUIZ SIMÔES DE ARAÚJO - EMBRAPA
Externa à Instituição - NORMA GOUVÊA RUMJANEK - EMBRAPA