Rising carbon dioxide [CO₂] levels and air temperature influence overall growth and production pattern of crop plants, and thus they help in understanding the functional relationship between the environment and crop performance. The present experiment was conducted to study the simultaneous effect of elevated CO₂ (550 ± 50 μmol mol⁻¹) and air temperature (2.5 ± 0.5 °C above ambient) on Hypericum perforatum growth, biomass and carbon-based plant secondary metabolite concentrations at free air CO₂ enrichment (FACE) and free air temperature increase (FATI) facilities of CSIR-Institute of Himalayan Bioresource Technology, Palampur, India during 2016-2017. Experiment was laid out in factorial CRD (completely randomized design) with five replications. Results showed that the growth and biomass were significantly affected by elevated CO₂ and temperature. Plant height at 140 days after exposure (DAE) and 280 DAE was 8.49% and 6.90% higher in FACE + FATI as compared to ambient, respectively. Total dry biomass was 35.70% and 55.20% higher in FACE + FATI as compared to ambient at 140 DAE and 280 DAE, respectively. Application of vermicompost recorded 8.50% higher biomass and 20.65% higher hypericin content as compared to control. Hypericin concentration reduced significantly by 22.00% in elevated CO_2, while under combined effect of elevated CO₂ and temperature it reduced by 19.30% when compared to ambient. Phenological stages i.e. bud and flower formations were advanced by 4 and 5 days, respectively, under FACE as compared to ambient.

二氧化碳[CO ₂ ]含量的升高和气温的升高会影响作物的总体生长和生产方式，因此有助于理解环境与作物生长之间的功能关系。进行本实验以研究升高的CO ₂（550±50μmolmol ^-1）和空气温度（高于环境2.5±0.5°C）对贯叶连翘生长，生物量和碳基植物次生代谢产物浓度的同时影响。自由空气CO ₂2016-2017年期间，印度帕兰普尔喜马拉雅生物资源技术研究院CSIR研究所的浓缩（FACE）和自由气温升高（FATI）设施。实验以阶乘CRD（完全随机设计）进行，重复了五次。结果表明，CO ₂和温度升高显着影响生长和生物量。与环境相比，FACE + FATI暴露后140天（DAE）和280 DAE的株高分别高8.49％和6.90％。与140 DAE和280 DAE的环境相比，FACE + FATI的总干生物量分别高出35.70％和55.20％。与对照相比，施用mi杂粉记录的生物量增加了8.50％，金丝桃素含量增加了20.65％。CO升高时，金丝桃素浓度显着降低22.00％_{如图2所示，}虽然在升高的CO ₂和温度的共同作用下，与环境相比它降低了19.30％。与环境相比，在FACE下的物候期，即芽和花的形成分别提前了4天和5天。