空气中的二氧化碳(CO2)水平可以影响植物的几种性状。大气CO2(eCO2)升高可以增强光合作用并提高植物生产力,包括生物质,尽管eCO2对植物生长反应的影响存在不一致之处。周围环境条件的复合效应,如光强度,光周期,水供应,和土壤营养成分可以影响eCO2提高植物生产力的程度。本研究旨在研究拟南芥在短光周期(8/16h,亮/暗周期)。这里,我们报告了eCO2对在短光周期下生长的拟南芥植物的芽生物量的减弱施肥作用。两个的生物量-,三-,四周龄的拟南芥植物增加了10%,15%,28%,分别,与环境CO2(aCO2,400ppm)(即对照)相比,在eCO2下。然而,莲座叶的数量,玫瑰花区,在两种CO2条件下,成熟植物的芽生物量相似,尽管在暴露于eCO2的植物中光合作用提高了40%。无论CO2水平如何,完全膨胀的莲座叶中叶绿素和类胡萝卜素的水平都相似。总之,CO2富集适度增加拟南芥幼年期的芽生物量,而eCO2诱导的芽生物量增加在成熟植物中并不明显。较短的日长可以以依赖于年龄的方式限制植物中的源到汇资源分配,因此,减少了在短光周期下生长的拟南芥植物中eCO2施肥对枝条生物量的影响。
The level of carbon dioxide (CO2) in the air can affect several traits in plants. Elevated atmospheric CO2 (eCO2) can enhance photosynthesis and increase plant productivity, including biomass, although there are inconsistencies regarding the effects of eCO2 on the plant growth response. The compounding effects of ambient environmental conditions such as light intensity, photoperiod, water availability, and soil nutrient composition can affect the extent to which eCO2 enhances plant productivity. This study aimed to investigate the growth response of Arabidopsis thaliana to eCO2 (800 ppm) under short photoperiod (8/16 h, light/dark cycle). Here, we report an attenuated fertilization effect of eCO2 on the shoot biomass of Arabidopsis plants grown under short photoperiod. The biomass of two-, three-, and four-week-old Arabidopsis plants was increased by 10%, 15%, and 28%, respectively, under eCO2 compared to the ambient CO2 (aCO2, 400 ppm) i.e. control. However, the number of rosette leaves, rosette area, and shoot biomass were similar in mature plants under both CO2 conditions, despite 40% higher photosynthesis in eCO2 exposed plants. The levels of chlorophylls and carotenoids were similar in the fully expanded rosette leaves regardless of the level of CO2. In conclusion, CO2 enrichment moderately increased Arabidopsis shoot biomass at the juvenile stage, whereas the eCO2-induced increment in shoot biomass was not apparent in mature plants. A shorter day-length can limit the source-to-sink resource allocation in a plant in age-dependent manner, hence diminishing the eCO2 fertilization effect on the shoot biomass in Arabidopsis plants grown under short photoperiod.