Banca de QUALIFICAÇÃO: YASMIN VASQUES BERCHEMBROCK

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE: YASMIN VASQUES BERCHEMBROCK
DATA: 14/09/2020
HORA: 14:00
LOCAL: Google Meet
TÍTULO:

Suppression of ERECTA signaling for gaining drought tolerance functions in soybean (Glycine max (L) Merril)

PALAVRAS-CHAVES:

Erecta gene; supression; drought tolerance 

PÁGINAS: 24
GRANDE ÁREA: Ciências Agrárias
ÁREA: Agronomia
SUBÁREA: Fitotecnia
ESPECIALIDADE: Melhoramento Vegetal
RESUMO:

Drought is a major limiting factor for plant growth and development, directly compromising agricultural production. The development of cultivars capable of tolerating prolonged periods of drought is important for the food production. The ERECTA (ER) family of genes, encoding leucine-rich repeat receptor-like kinase, besides influencing plant morphology, also regulates physiological aspects, and reportedly plays an important role in abiotic stresses such as drought and heat. In this study, transgenic soybean plants, suppressed in ER signaling, were evaluated over three generations, T₂, T₃ and T₄, for phenotypic performance and response to drought conditions. First, a strong inverse correlation of transgene expression with the index of agronomic performance of soybean plants was observed. Among the T₂ plants submitted to drought stress, only stunted plants showed tolerance to water deficit. However, two T₃ lines were identified that expressed the transgene as well as showed favorable agronomic properties. The drought stress experiments on the progenies T₄ from these lines, however, found no significant gain in water use efficiency and stomatal conductance. This observation indicates that reduced plant growth through the modulation of ER signaling in the stunted plants leads to reduced water demand rather than drought tolerance in the transgenic plants. Acoordingly, the selected transgenic plants that showed higher biomass, demanded more water, and became more susceptible to periods of water withholding.

MEMBROS DA BANCA:
Interno - ADRIANO TEODORO BRUZI (Suplente)
Interno - EVANDRO NOVAES (Membro)
Presidente - FLAVIA BARBOSA SILVA BOTELHO (Membro)
Externo ao Programa - ISABELA PEREIRA DE LIMA - DAG/ECA (Membro)
Externo à Instituição - MARCOS PAULO DA SILVA - UARK (Membro)