Banca de DEFESA: EDISON ANTONIO DE MATTOS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : EDISON ANTONIO DE MATTOS
DATE: 23/02/2024
TIME: 09:30
LOCAL: Sala de Seminários I do DBG
TITLE:

Seasonal alterations of water status and gas exchanges in Cattleya granulosa juvenile plants submitted to different light regimes

KEY WORDS:

Crassulacean acid metabolism, epiphytic orchid, light stress, seasonal variation. tropical sandbank

PAGES: 90
BIG AREA: Ciências Agrárias
AREA: Recursos Florestais e Engenharia Florestal
SUBÁREA: Silvicultura
SPECIALTY: Fisiologia Florestal
SUMMARY:

Cattleya granulosa is an endangered epiphytic orchid native to the Brazilian Atlantic Forest. Since its responses to light intensity and its CAM expression remain elusive, C. granulosa juvenile plants were grown under full sunlight, 60% shading, and 95% shading in a nursery and plant growth, water status, titratable acidity, and gas exchanges were assessed during the rainy and dry seasons. The plants exposed to full sunlight showed visual symptoms of light stress but survived throughout the experiment. These plants exhibited reduced shoots and extensive roots regarding the plants submitted to shading. The time-course of CO₂ uptake and stomatal conductance in C. granulosa leaves over 24 h, independent of treatment, is compatible with constitutive CAM. However, changes in timelapse and magnitude of CO₂ uptake and in accumulated acidity promoted by light regime and seasonality reveal that CAM expression in C. granulosa leaves may be modulated according to growing conditions.

COMMITTEE MEMBERS:
Presidente - 1228866 - EDUARDO LUIZ VOIGT
Interno - 1755074 - LEONARDO DE MELO VERSIEUX
Externa à Instituição - CRISTIANE GOUVEA FAJARDO