Rodrigues Bianca Jaqueline Santos, Bacarin Marcos Antonio, Borella Junior
Department of Botany, Federal University of Pelotas (UFPel), C.P. 354, Pelotas, RS 96160-000 Brazil.
Institute of Biological Sciences, Federal University of Rio Grande (FURG), C.P. 474, Rio Grande, RS 96203-900 Brazil.
Physiol Mol Biol Plants. 2025 Apr;31(4):641-645. doi: 10.1007/s12298-025-01587-1. Epub 2025 Apr 23.
Mart. is an aquatic macrophyte native to South America, tolerant to high intensity of sunlight and has spread to various countries worldwide. This study aimed to investigate the photosynthetic characteristics of leaves under different light intensities and CO concentrations by analyzing net photosynthetic response, Rubisco activity, and related photosynthetic parameters. The plants were acclimated in a greenhouse under natural light conditions at a temperature of 25 ± 5 °C. The light response curve was measured using a portable infrared gas exchange system, coupled with the 6400-40 Leaf Chamber Fluorometer. The response of net photosynthesis to intercellular CO concentration was determined at 1500 µmol m s of photosynthetic active radiation (PAR). demonstrated a remarkable capacity for adaptation to varying light intensities and CO concentrations, exhibiting strong photosynthetic efficiency, as indicated by its net CO assimilation rate in response to PAR, sustained electron transport rate up to 1000 µmol photons m s, a positive correlation between φPSII and φCO, and a high net CO assimilation rate in response to .
Mart.是一种原产于南美洲的水生大型植物，耐高强度阳光，已传播到世界各国。本研究旨在通过分析净光合响应、核酮糖-1,5-二磷酸羧化酶（Rubisco）活性及相关光合参数，研究不同光照强度和二氧化碳浓度下叶片的光合特性。将植物置于温度为25±5°C的自然光条件下的温室中驯化。使用便携式红外气体交换系统结合6400-40叶室荧光仪测量光响应曲线。在光合有效辐射（PAR）为1500 μmol m⁻² s⁻¹时测定净光合作用对细胞间二氧化碳浓度的响应。结果表明，Mart.对不同光照强度和二氧化碳浓度具有显著的适应能力，光合效率强，表现为其对PAR的净二氧化碳同化率、高达1000 μmol光子 m⁻² s⁻¹的持续电子传递速率、光系统II有效量子产量（φPSII）与二氧化碳同化量子产量（φCO）之间的正相关以及对[具体二氧化碳浓度]的高净二氧化碳同化率。
