Leaf anatomical structures of <Emphasis Type="Italic">Paphiopedilum</Emphasis> and <Emphasis Type="Italic">Cypripedium</Emphasis> and their adaptive significance |
| |
Authors: | Zhi-Jie Guan Shi-Bao Zhang Kai-Yun Guan Shu-Yun Li Hong Hu |
| |
Institution: | (1) Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650204, China;(2) Graduate University of the Chinese Academy of Sciences, Beijing, 100039, China;(3) Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming, 650223, China; |
| |
Abstract: | Paphiopedilum and Cypripedium are closely related in phylogeny, but have contrasting leaf traits and habitats. To understand the divergence in leaf traits
of Paphiopedilum and Cypripedium and their adaptive significance, we analyzed the leaf anatomical structures, leaf dry mass per area (LMA), leaf lifespan
(LL), leaf nitrogen concentration (N
mass), leaf phosphorus concentration (P
mass), mass-based light-saturated photosynthetic rate (A
mass), water use efficiency (WUE), photosynthetic nitrogen use efficiency (PNUE) and leaf construction cost (CC) for six species.
Compared with Cypripedium, Paphiopedilum was characterized by drought tolerance derived from its leaf anatomical structures, including fleshy leaves, thick surface
cuticles, huge adaxial epidermis cells, lower total stoma area, and sunken stomata. The special leaf structures of Paphiopedilum were accompanied by longer LL; higher LMA, WUE, and CC; and lower N
mass, P
mass, A
mass, and PNUE compared with Cypripedium. Leaf traits in Paphiopedilum helped it adapt to arid and nutrient-poor karst habitats. However, the leaf traits of Cypripedium reflect adaptations to an environment characterized by rich soil, abundant soil water, and significant seasonal fluctuations
in temperature and precipitation. The present results contribute to our understanding of the divergent adaptation of leaf
traits in slipper orchids, which is beneficial for the conservation of endangered orchids. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|