Sugarcane Responses to Water Deficit Are Modulated by Environmental CO2 Concentration in a Genotype and Scale Dependent-Manner

• DOI: 10.3390/agronomy15030726
• Publication Date: 2025-03-18T08:34:43Z
• Authors: Zulma Catherine C...; Elberth Hernando ...; Paulo Cássio Alve...; Antonia Almeida d...; Claudia Rita de S...; Mewael Kiros Assefa; João Paulo Rodrig...; Paulo Eduardo Rib...

Events by changes in climate alter the growth and physiology of sugarcane. In this context, study aimed to investigate morphological, anatomical, physiological responses two different sugarcane varieties under a condition high carbon dioxide (CO2) associated with water deficit, testing hypothesis that drought are modulated plant scales. Thirty days after sprouting, plants were grown atmosphere (400 680 μmol CO2 mol−1 air) restriction conditions. At morphological level, we assessed total biomass, height, stem diameter, leaf area, root-shoot ratio; at relative content, use efficiency, vivo maximum rate Rubisco, PEPC carboxylation, photosynthesis, organic carbon, nitrogen, carbon-nitrogen ratio. anatomical stomatal density adaxial abaxial surfaces wall thickness bundle sheath cells. The results indicate all levels, response exposed concentration is genotype-dependent. general, variety RB855536 showed greater responses: better efficiency alteration carboxylation Rubisco enzyme, while RB867515 determined biomass allocation alterations densities functionality. deficit developed strategies based on physiological, and/or useful for facing change scenarios, effects can be mitigated air.