Luiz Santos Hariane, Ferreira da Silva Gustavo, Rodrigues Alves Carnietto Melina, Silva Gustavo Ferreira da, Nascimento Fernandes Caio, Ferreira Lusiane de Sousa, de Almeida Silva Marcelo
Laboratory of Ecophysiology Applied to Agriculture (LECA), Department of Crop Production, School of Agricultural Sciences, Sâo Paulo State University (UNESP), Botucatu 18610-034, SP, Brazil.
Agricultural Sciences Center, Department of Biotechnology and Plant and Animal Production, Federal University of São Carlos (UFSCar), Araras 13600-970, SP, Brazil.
Plants (Basel). 2025 Sep 2;14(17):2732. doi: 10.3390/plants14172732.
Phosphorus (P) is essential for sugarcane growth but often presents low agricultural use efficiency. This research evaluated the effects of UFV 3918 (), applied alone or with monoammonium phosphate (MAP), on sugarcane's physiological, biochemical, and biomass variables. Six treatments were tested in a completely randomized design: absolute control (AC), commercial control (CC, full MAP dose), alone, and combined with 1/3, 2/3, or full MAP dose. and + 1/3 MAP increased soil P availability by 22%, correlating strongly with physiological, biochemical, and shoot biomass variables. These treatments boosted total chlorophyll content (11.4%), electron transport rate (28.5%), and photochemical quenching (16.9%), resulting in higher photosynthetic efficiency. Compared with CC, net CO assimilation, stomatal conductance, and carboxylation efficiency increased by 49.0%, 35.4%, and 72.9%, respectively. Additionally, amino acid content and leaf acid phosphatase activity rose by 12.1% and 13.8%. Key traits associated with biomass production included stomatal density (abaxial face), chlorophyll content, electron transport rate, intercellular CO concentration, and leaf acid phosphatase activity. The results highlight the potential of UFV 3918, particularly with reduced MAP doses, to improve sugarcane photosynthesis and biomass accumulation, offering a sustainable and cost-effective fertilization strategy.
磷（P）对甘蔗生长至关重要，但农业利用效率往往较低。本研究评估了单独施用或与磷酸一铵（MAP）一起施用UFV 3918对甘蔗生理、生化和生物量变量的影响。采用完全随机设计测试了六种处理：绝对对照（AC）、商业对照（CC，MAP全剂量）、单独施用UFV 3918以及与1/3、2/3或全剂量MAP组合施用。UFV 3918单独施用以及与1/3 MAP组合施用使土壤有效磷含量提高了22%，与生理、生化和地上部生物量变量密切相关。这些处理使总叶绿素含量提高了11.4%，电子传递速率提高了28.5%，光化学猝灭提高了16.9%，从而提高了光合效率。与CC相比，净CO2同化率、气孔导度和羧化效率分别提高了49.0%、35.4%和72.9%。此外，氨基酸含量和叶片酸性磷酸酶活性分别提高了12.1%和13.8%。与生物量生产相关的关键性状包括气孔密度（叶背面）、叶绿素含量、电子传递速率、细胞间CO2浓度和叶片酸性磷酸酶活性。结果突出了UFV 3918的潜力，特别是在降低MAP剂量的情况下，可提高甘蔗光合作用和生物量积累，提供了一种可持续且具有成本效益的施肥策略。
