Feng Jing-Qiu, Wang Ji-Hua, Zhang Shi-Bao
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.
University of Chinese Academy of Sciences, Beijing, 100049, China.
Plant Divers. 2021 May 17;44(1):101-108. doi: 10.1016/j.pld.2021.05.001. eCollection 2022 Jan.
and 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 °C; Puer, 17.7 ± 0.2 °C; Menglun, 23.3 ± 0.2 °C) in southwest China. Compared with those at Puer and Kunming, the values of light-saturated photosynthetic rate (P), stomatal conductance (g), leaf thickness (LT), and stomatal density (SD) in both species were lower at Menglun. The values of P, g, LT, adaxial cuticle thickness (CT) and SD in were higher than those of at the three sites. Compared with , there were no flowering plants of at Menglun. These results indicated that both species were less resistance to high temperature, and had a stronger adaptability to high-temperature than . Our findings can provide valuable information for the conservation and cultivation of species.
[物种名称1]和[物种名称2]是两种濒危兰花物种，具有很高的观赏和保护价值。它们是同域物种，但叶片解剖特征和花期存在显著差异。然而，尚不清楚这两个物种的叶片结构差异是否会影响它们对温度的适应性。在此，我们在中国西南部三个温度不同的地点（昆明，16.7±0.2°C；普洱，17.7±0.2°C；勐仑，23.3±0.2°C）调查了这两个物种的叶片光合、解剖和开花特征。与普洱和昆明的相比，两个物种在勐仑的光饱和光合速率（P）、气孔导度（g）、叶片厚度（LT）和气孔密度（SD）值均较低。在三个地点，[物种名称1]的P、g、LT、上表皮角质层厚度（CT）和SD值均高于[物种名称2]。与[物种名称1]相比，[物种名称2]在勐仑没有开花植株。这些结果表明，两个物种对高温的耐受性均较差，且[物种名称1]对高温的适应性强于[物种名称2]。我们的研究结果可为[物种名称]的保护和栽培提供有价值的信息。
