Leaf Anatomical Characteristics and Environmental Adaptability of Seven Sorbus Species at Longcanggou National Forest Park

doi:10.7525/j.issn.1673-5102.2022.02.002

Abstract

Abstract:

Leaf anatomical structures of seven Sorbus species at Longcanggou National Forest Park in Sichuan Province were observed by paraffin section method， and the relationship between leaf anatomical structure and environment was discussed in this study. The results showed that： the leaves of seven species were all of typical dorsal-ventral pattern； leaf thickness ranged from 108.16-208.21 μm， significant differences（P<0.01） were observed in the studied species； upper epidermis thickness was greater than the lower， furthermore， papillae were observed in the lower epidermis of pinnate-leaved species； palisade parenchyma was composed of 1-2 layers of cells， the ratio of palisade parenchyma to spongy parenchyma in thickness of S. prattii var. aestivalis was 1.93， and the rest of six species were less than 1 respectively； the vascular bundles of the midrib were all heart-shaped， which were typical collateral vascular bundle； the differences of midrib protuberant degree among species were extremly significant（P<0.01）. Among the anatomical structures， the plasticity of the upper and lower epidermis was the largest， which had strong potential adaptability in the habitat； the midrib had the least plasticity and the overall structure was relatively stable. Palisade parenchyma， spongy parenchyma and midrib were the most different anatomical structures among the seven species. Correlation analysis between leaf anatomical structures and environmental variables indicated that palisade parenchyma thickness， the ratio of palisade parenchyma to spongy parenchyma and cell tense ratio were positively correlated with annual precipitation， precipitation of warmest quarter and altitude（P<0.05）， and were negatively correlated with temperature seasonality（P<0.05）； diameter and protuberant degree of midrib were positively correlated with seasonal temperature（P<0.01）， and were negatively correlated with annual precipitation， precipitation of warmest quarter and altitude（P<0.05）. The adaptability of leaf anatomical characteristics reflect the survival strategies of seven Sorbus species at Longcanggou National Forest Park.

Key words: Sorbus, leaf anatomical structure, plasticity, environmental adaptability

CLC Number:

Q944.5

Kailin Zhu, Jiabao Li, Xin Chen. Leaf Anatomical Characteristics and Environmental Adaptability of Seven Sorbus Species at Longcanggou National Forest Park[J]. Bulletin of Botanical Research, 2022, 42(2): 174-183.

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