Leaf physiological and anatomical responses of two sympatric Paphiopedilum species to temperature

doi:10.1016/j.pld.2021.05.001

Plant Diversity ›› 2022, Vol. 44 ›› Issue (01): 101-108.DOI: 10.1016/j.pld.2021.05.001

Leaf physiological and anatomical responses of two sympatric Paphiopedilum species to temperature

Jing-Qiu Feng^a,b, Ji-Hua Wang^c, Shi-Bao Zhang^a

a Key Laboratory of Economic Plants and Biotechnology, Yunnan Key Laboratory for Wild Plant Resources, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201, Yunnan, China;
b University of Chinese Academy of Sciences, Beijing, 100049, China;
c Flower Research Institute of Yunnan Academy of Agricultural Sciences, Kunming, 650205, Yunnan, China

收稿日期:2020-12-28 修回日期:2021-03-19 出版日期:2022-02-25 发布日期:2022-03-12
通讯作者: Shi-Bao Zhang
基金资助:
This work was financially supported by the National Natural Science Foundation of China (31970361), the Applied Basic Research Plan of Yunnan Province (2018FA016), the Science and Technology Plan of Yunnan (2018BB010), and the project for Construction of International Flower Technology Innovation Center and Achievement Industrialization (2019ZG006), and the Project for Innovation Team of Yunnan Province. Thanks to Dr. John A Meadows for proofreading and editing. Thanks to Mr. Jianbo Yang for helping to make the map of species distribution.

Leaf physiological and anatomical responses of two sympatric Paphiopedilum species to temperature

Jing-Qiu Feng^a,b, Ji-Hua Wang^c, Shi-Bao Zhang^a

a Key Laboratory of Economic Plants and Biotechnology, Yunnan Key Laboratory for Wild Plant Resources, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201, Yunnan, China;
b University of Chinese Academy of Sciences, Beijing, 100049, China;
c Flower Research Institute of Yunnan Academy of Agricultural Sciences, Kunming, 650205, Yunnan, China

Received:2020-12-28 Revised:2021-03-19 Online:2022-02-25 Published:2022-03-12
Contact: Shi-Bao Zhang
Supported by:
This work was financially supported by the National Natural Science Foundation of China (31970361), the Applied Basic Research Plan of Yunnan Province (2018FA016), the Science and Technology Plan of Yunnan (2018BB010), and the project for Construction of International Flower Technology Innovation Center and Achievement Industrialization (2019ZG006), and the Project for Innovation Team of Yunnan Province. Thanks to Dr. John A Meadows for proofreading and editing. Thanks to Mr. Jianbo Yang for helping to make the map of species distribution.

摘要/Abstract

摘要： Paphiopedilum dianthum and P. micranthum are two endangered orchid species, with high ornamental and conservation values. They are sympatric species, but their leaf anatomical traits and flowering period have significant differences. However, it is unclear whether the differences in leaf structure of the two species will affect their adaptabilities to temperature. Here, we investigated the leaf photosynthetic, anatomical, and flowering traits of these two species at three sites with different temperatures (Kunming, 16.7 ± 0.2℃; Puer, 17.7 ± 0.2℃; Menglun, 23.3 ± 0.2℃) in southwest China. Compared with those at Puer and Kunming, the values of light-saturated photosynthetic rate (P_max), stomatal conductance (g_s), leaf thickness (LT), and stomatal density (SD) in both species were lower at Menglun. The values of P_max, g_s, LT, adaxial cuticle thickness (CT_ad) and SD in P. dianthum were higher than those of P. micranthum at the three sites. Compared with P. dianthum, there were no flowering plants of P. micranthum at Menglun. These results indicated that both species were less resistance to high temperature, and P. dianthum had a stronger adaptability to high-temperature than P. micranthum. Our findings can provide valuable information for the conservation and cultivation of Paphiopedilum species.

关键词: Conservation, Cultivation, High-temperature, Leaf anatomy, Paphiopedilum, Photosynthesis

Abstract: Paphiopedilum dianthum and P. micranthum are two endangered orchid species, with high ornamental and conservation values. They are sympatric species, but their leaf anatomical traits and flowering period have significant differences. However, it is unclear whether the differences in leaf structure of the two species will affect their adaptabilities to temperature. Here, we investigated the leaf photosynthetic, anatomical, and flowering traits of these two species at three sites with different temperatures (Kunming, 16.7 ± 0.2℃; Puer, 17.7 ± 0.2℃; Menglun, 23.3 ± 0.2℃) in southwest China. Compared with those at Puer and Kunming, the values of light-saturated photosynthetic rate (P_max), stomatal conductance (g_s), leaf thickness (LT), and stomatal density (SD) in both species were lower at Menglun. The values of P_max, g_s, LT, adaxial cuticle thickness (CT_ad) and SD in P. dianthum were higher than those of P. micranthum at the three sites. Compared with P. dianthum, there were no flowering plants of P. micranthum at Menglun. These results indicated that both species were less resistance to high temperature, and P. dianthum had a stronger adaptability to high-temperature than P. micranthum. Our findings can provide valuable information for the conservation and cultivation of Paphiopedilum species.

Key words: Conservation, Cultivation, High-temperature, Leaf anatomy, Paphiopedilum, Photosynthesis

Jing-Qiu Feng, Ji-Hua Wang, Shi-Bao Zhang. Leaf physiological and anatomical responses of two sympatric Paphiopedilum species to temperature[J]. Plant Diversity, 2022, 44(01): 101-108.

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Leaf physiological and anatomical responses of two sympatric Paphiopedilum species to temperature

Leaf physiological and anatomical responses of two sympatric Paphiopedilum species to temperature

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