PJB-2023-427
Influence of light quality on photosynthesis and plant morphology of Polygonatum cyrtonema Hua and Polygonatum sibiricum Delar.ex Redoute
Jun LIu
Abstract
The underground tubers of Polygonatum cyrtonema Hua and Polygonatum sibiricum Delar.ex Redoute are the source of the traditional Chinese medicine herb Huangjing. In order to study the selection of light quality for the facility nursery of herb Huangjing, in this paper, the seedlings of P. cyrtonema and P. sibiricum were subjected to red, blue and white light treatments, gas exchange parameters and chlorophyll fluorescence parameters were measured by Li-6400 portable photosynthesis device, chlorophyll content of leaves was determined by 95% ethanol extraction, and leaf morphology data of the plants were obtained. The results showed that, these two species of herb Huangjing had the highest overall Pn-PAR curves and the highest maximum net photosynthetic rate (Pn) from the fit under blue light treatment. The Pn was significantly positively correlated with photosynthetically active radiation (PAR) and negatively correlated with intercellular carbon dioxide concentration (Ci). The total chlorophyll content of the plants also showed the highest in blue light and the lowest in red light. Two species of the herb Huangjing were the highest and underground tubers increased the most under blue light treatment, while plants grew weak and even death under red light treatment. Chlorophyll content was highly significantly and positively correlated with electron transfer rate (ETR), PSII effective electron yield (ФPSII), and growth of underground tubers. The blue light treatment made a large positive contribution to the chlorophyll content, ETR and underground tuber growth of herb Huangjing. It can be seen that two species of the herb Huangjing both have a strong ability to utilize blue light. P. cyrtonema is especially adapted to blue light. It can be considered to use a high proportion of blue light when cultivation in facilities of P. cyrtonema and P. sibiricum.
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