Diolina Moura Silva

Title : Photochemical efficiency of hose culture CV. Palmer in an agroforest system

Abstract:

This study aimed to evaluate ecophysiological parameters in mango plants of the Palmer cultivar in two cropping systems: Agroforestry (AFS) and Conventional (Conv). AFS can serve as an alternative to conventional agriculture, preventing soil degradation, enhancing soil fertility regeneration, and increasing agricultural production. We utilized photosynthesis, transient fluorescence of chlorophyll a, and gas exchange measurements to compare the two systems. Mango plants (Mangifera indica L.) cultivar Palmer with five years of planting, grafted on cultivar Oil and cultivated in the municipality of Aracruz-ES-Brazil were used. Eight mango trees were randomly selected for each treatment in a completely randomized design. Measurements were taken during the dry period with mild temperatures (August and September 2020) and the rainy period with high temperatures (October to January 2021). The transfer of excitation energy between the reaction centers (dVG/dt₀) and the closing of the reaction centers (dV/dt₀) were higher in the conventional treatment plants (1.07 and 1.54) in relation to the SAF (0 .81 and 0.44) showing that under the agroforestry system the plants showed greater efficiency in the process of reduction and reoxidation of Quinone A (QA) in photosystem II (PSII) even under the stress of mild temperatures and drought. The efficiency with which electrons can move to the electron transport chain (ΨE0) was lower in the conventional treatment (0.34) than the SAF (0.48). The greater biodiversity and soil coverage in the SAF contribute to better water availability for plants, reducing the impacts of the dry period on PSII efficiency.

What will audience learn from your presentation?

• This study can be applied to other plant species as well.
• These analyses can serve as important tools for the diagnosis and evaluation of the quality of commercial fruits.
• Diagnosis through chlorophyll a fluorescence can provide faster detection compared to traditional methods that are typically conducted at a later stage.

Biography:

Diolina Moura Silva completed her doctorate in Plant Physiology at the Federal University of Vicosa (UFV) in 1998. She is currently a Full Professor at the Federal University of Espírito Santo. She is also professor-advisor of the Graduate Program in Plant Biology and the Graduate Program in Biotechnology at the Federal University of Espírito Santo. She was the Coordinator of the Graduate Program in Plant Biology from its creation in 2003 until 2007. She works in the area of Plant Physiology and Biotechnology. She is the coordinator of the Photosynthesis Research Center, developing projects focused on the Photosynthesis of cultivated plants and particularly on the ecophysiology of fruit trees. In the context of her scientific and technological production, transient fluorescence of chlorophyll a, Photochemical efficiency, Photosynthesis.