Variation of leaf traits with altitude in Lonicera caerulea var. Edulis (Caprifoliaceae) from northeastern china | [Pakistan Journal of Botany • 2021]

Author(s):

1. ZHIHUI LUAN: School of Life Sciences, Changchun Normal University, 677 North Changji Road, Changchun 130032, Jilin Province, People’s Republic of China : Forestry College, BeiHua University, 3999 Eastern Road Binjiang, Jilin 132013, Jilin Province, People’s Republic of China : National Engineering Laboratory for Druggable Gene and Protein Screening, Northeast Normal University, Changchun 130117, People’s Republic of China

2. DIANKUN SHAO: Jilin Institute of Land and Resources Investigation and Planning,Changchun 130012, Jilin Province,People's Republic of China

3. QIGE QI: Forestry College, BeiHua University,3999 Eastern Road Binjiang, Jilin 132013, Jilin Province,People's Republic of China

4. QICHANG ZHANG: Forestry College, BeiHua University,3999 Eastern Road Binjiang, Jilin 132013, Jilin Province,People's Republic of China

5. XIN GAO: Forestry College, BeiHua University,3999 Eastern Road Binjiang, Jilin 132013, Jilin Province,People's Republic of China

6. JINGE LUAN: Forestry College, BeiHua University,3999 Eastern Road Binjiang, Jilin 132013, Jilin Province,People's Republic of China

7. MINGFENG LIN: Forestry College, BeiHua University,3999 Eastern Road Binjiang, Jilin 132013, Jilin Province,People's Republic of China

8. WEIQING JIANG: Songjianghe Forestry Bureau,Fusong 134504, Jilin Province,People's Republic of China

Abstract:

Leaf structure, orientation and other properties along elevation gradients in seven populations of Lonicera caerulea var. edulis in the Changbai Mountains of China were studied to evaluate the relationship between the properties of adaptability to alpine environment. Leaf architecture was isolateral at low altitude, but dorsiventral at high altitudes, whereas the leaf orientation in space changed from upright to horizontal. Raised stomata were present in Lonicera caerulea var. edulis and their density increased with increasing elevation. Leaf thickness initially increased with altitude, but then decreased. Between 600 m and 1400 m, palisade parenchyma thickness increased but then decreased above 1600 m, reaching a minimum at 1800 m, a pattern also reflected by spongy parenchyma. The palisade parenchyma thickness/spongy parenchyma thickness ratio increased with increasing altitude. By contrast, the thickness of the upper epidermis decreased with increasing altitude, whereas there was no change in the lower epidermis. There were significant differences in the ecological indicators of L. caerulea var. edulis at seven altitudes. Leaf area (LA) and leaf biomass (LB) were highest at 1800 m, whereas the specific leaf area (SLA) was the highest at 1600 m. The leaf saturated weight (SW), LB and the specific leaf weight (LMA) were lowest at 1200 m. At 600 m, LA, SLA and SW/LB were the lowest, whereas LMA was highest at 800 m. The leaf saturated water content (SWC) and SW/LB were also highest at 600 m. Therefore, there was a significant correlation between leaf and environmental factors at different altitudes, indicating that Lonicera caerulea var. edulis modifies its structure and morphology to adapt to alpine environments with a thin atmosphere, lower oxygen levels, low temperatures, heavy rainfall and strong solar radiation.

Page(s): 949-957

DOI: 10.30848/PJB2021-3(43)

Published: Journal: Pakistan Journal of Botany, Volume: 53, Issue: 3, Year: 2021

Keywords:

Leaf structure , Lonicera caerulea var , Adaptability properties , Different altitudes , edulis

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