Physiological characterization of drought tolerance in peanut.

GUZZO MC; LUNA FD; SCHENFELD E; MONTEOLIVA ML

Rosario

Congreso; Sociedad Argentina de Fisiologia Vegetal; 2023

Drought is one of the most limiting environmental factors reducing yields in agriculture. Peanut is a crop usually carried out raid-fed only, which make it susceptible to seasonal droughts. Drought tolerance could manifest in several physiological responses, such as higher relative water content (RWC), higher chlorophylls, proline, or FRAP, or lower MDA (oxidative damage). To improve productivity under these conditions, it is relevant to identify and characterize drought tolerant responses in peanut. Our project aimed to characterize drought tolerance in peanut in vegetative and reproductive stages, under controlled drought. We evaluated peanut lines from Criadero El Carmen (Gral. Cabrera, Cordoba, Argentina) and then we characterized in deep on of them. We previously found variability in stress responses, with genotypes that keep higher RWC than 70%, and exhibited biochemical changes. Here we will discuss novel results in sugar content (by HPLC) and photosynthesis related parameters. We found differences in leaf temperature, internal CO2 concentration in the mesophyll and stomatal conductanc