Laboratório de Fisiologia Ecológica de Plantas, Lafieco, Botany Department, Biosciences Institute at University of São Paulo, São Paulo, Brazil.
Departamento de Ciências Ambientais, Universidade Federal de São Paulo, São Paulo, Brazil.
Sci Rep. 2023 Sep 22;13(1):15832. doi: 10.1038/s41598-023-40783-5.
The CO concentration has increased in the atmosphere due to fossil fuel consumption, deforestation, and land-use changes. Brazil represents one of the primary sources of food on the planet and is also the world's largest tropical rainforest, one of the hot spots of biodiversity in the world. In this work, a meta-analysis was conducted to compare several CO Brazilian experiments displaying the diversity of plant responses according to life habits, such as trees (79% natives and 21% cultivated) and herbs (33% natives and 67% cultivated). We found that trees and herbs display different responses. The young trees tend to allocate carbon from increased photosynthetic rates and lower respiration in the dark-to organ development, increasing leaves, roots, and stem biomasses. In addition, more starch is accumulated in the young trees, denoting a fine control of carbon metabolism through carbohydrate storage. Herbs increased drastically in water use efficiency, controlled by stomatal conductance, with more soluble sugars, probably with a transient accumulation of carbon primarily stored in seeds as a response to elevated CO.
由于化石燃料消耗、森林砍伐和土地利用变化，大气中的 CO 浓度不断增加。巴西是地球上主要的粮食供应地之一，也是世界上最大的热带雨林，是世界生物多样性热点地区之一。在这项工作中，进行了荟萃分析，比较了几个巴西 CO 实验，根据生活习性（如树木[79%为本地种和 21%为栽培种]和草本植物[33%为本地种和 67%为栽培种]）展示了植物对 CO 增加的不同响应。我们发现树木和草本植物有不同的响应。幼树倾向于将光合作用增强和暗呼吸降低所产生的碳分配到器官发育中，从而增加叶片、根系和茎的生物量。此外，幼树中积累了更多的淀粉，这表明通过碳水化合物储存来精细控制碳代谢。草本植物通过气孔导度控制，大幅提高了水分利用效率，同时积累更多的可溶性糖，可能是由于碳的短暂积累，主要以种子的形式储存，以应对 CO 浓度升高。
