Henan Institute of Science and Technology, Xinxiang, China, 453003.
Sci Rep. 2020 Jun 22;10(1):10043. doi: 10.1038/s41598-020-67192-2.
The ecological and economic cultivation of Isodon rubescens is currently being carried out. The demand of I. rubescens for light intensity should be made clear to estimate whether the environmental conditions of an area are suitable for cultivating I. Rubescens and improve cultivation techniques. The photosynthetic and chlorophyll fluorescence characteristics of I. rubescens were determined with a Li-6400 photosynthesis system and PAM-2500 portable chlorophyll fluorescence apparatus. The results showed that there was no obvious midday depression of photosynthesis in I. rubescens leaves. The light compensation point and light saturation point of I. rubescens leaves were 21.83482 µmol·m·s and 802.262 µmol·m·s, respectively. The CO compensation point and CO saturation point of I. rubescens leaves were 101.7199 µmol·mol and 1674.514 µmol·mol, respectively. The maximal photochemical efficiency of photosystem II ((Fm-Fo)/Fm) in I. rubescens leaves reached 0.7. The electron transport rate of photosystem II in I. rubescens leaves reached 20 μmol electrons/(m·s). I. rubescens can tolerate intense light above the light compensation point and utilize low light. I. rubescens leaves have a strong photoprotective capacity. I. rubescens can grow in both sunny and shady places. The most important factor affecting photosynthetic efficiency in I. rubescens leaves is the concentration of CO in air.
目前正在进行冬凌草的生态和经济栽培。应明确冬凌草对光强的需求，以评估一个地区的环境条件是否适合栽培冬凌草，并改进栽培技术。利用 Li-6400 光合作用系统和 PAM-2500 便携式叶绿素荧光仪测定了冬凌草的光合和叶绿素荧光特性。结果表明，冬凌草叶片光合作用中午没有明显的抑制现象。冬凌草叶片的光补偿点和光饱和点分别为 21.83482 μmol·m·s 和 802.262 μmol·m·s，CO 补偿点和 CO 饱和点分别为 101.7199 μmol·mol 和 1674.514 μmol·mol，叶片 PSII 最大光化学效率((Fm-Fo)/Fm)达到 0.7，PSII 电子传递速率达到 20 μmol 电子/(m·s)。冬凌草可以耐受光补偿点以上的强光，并利用低光。冬凌草叶片具有很强的光保护能力。冬凌草可以在阳光充足和阴暗的地方生长。影响冬凌草叶片光合作用效率的最重要因素是空气中 CO 的浓度。
