Abstract
The odd-pinnately compound leaves of short pod-branch surrounding the fruit growth of Roxburgh rose (Rosa roxburghii Tratt.) are the source organ of photosynthesis, and the photosynthetic capacity of leaves is an important factor determining the yield. To analyze the relationship between the distribution of palisade cells in different leaf positions and photosynthesis in the flowering and fruiting stage, the microstructure, photosynthetic physiology, and gas exchange parameters of each leaf position were measured. The leaves located in the middle of short pod-branches were rich in columnar cells and showed higher chlorophyll content and, thus, higher light absorption by the leaves than other leaf positions, which conducted to enhanced photosynthesis and outstanding photosynthetic capacity under sufficient light environment. Yet, the first leaf was immature, and the differentiation of mesophyll cells was not completed, which resulted in a weakening of photosynthesis per unit leaf area under adiquate light environment. The lower leaves of short pod-branches showed smaller leaf area and looser spongy mesophyll in an environment with light blocking, which resulted in insufficient photosynthetic capacity. Our findings indicate that the photosynthetic conversion ability of the middle leaf of short pod branch is the most prominent. Therefore, regulating leaf mesophyll cells distribution according to leaf position is essential for effective leaf photosynthesis at the flowering and fruit stage in Roxburgh rose.
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ACKNOWLEDGMENTS
The research is supported by the Natural Science Foundation of Guizhou Provincial Education Department, China (grant no. KY [2018]378); and the Science and Technology Planning Project of Guizhou Provincial Science and Technology Department, China (grant no. [2020] 1Y097).
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Abbreviations: CI—intercellular CO2 concentration; GS—stomatal conductance; PN—net-photosynthetic rate; PAR—photosynthetically active radiation; TR—transpiration rate.
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Zhang, C., Wei, L.J., Li, X.T. et al. Comparative Study on Photosynthetic Capacity of Different Leaves on Short Pod-Branch of Rosa roxburghii Tratt. in the Yunnan-Guizhou Plateau. Russ J Plant Physiol 69, 48 (2022). https://doi.org/10.1134/S1021443722030190
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DOI: https://doi.org/10.1134/S1021443722030190