Comparative study on development and structural characteristics of bracts and leaves of Tilia japonica Simonk
Peng Lin-Lin1, Xia Xiao-Fei3, Wang Ao1, Zhao Liang-Cheng1,2
1. School of Ecology and Nature Conservation, Beijing Forestry University, Beijing 100083, China;
2. Museum of Beijing Forestry University, Beijing 100083, China;
3. Beijing Museum of Natural History, Beijing 100050, China
Inflorescence bracts are the most typical characteristics of Tilia Linn., but their evolutionary relationship with other organs is not clear. In this study, correlations between the growth and development of bracts and leaves of Tilia japonica Simonk. were analyzed, and their epidermal micromorphological features and internal anatomical structures were compared. Results indicated that the growth and development processes of the bracts and leaves had very similar regularity. Both grew rapidly in the young stage, slowly in the middle stage, and only slightly in the mature stage. Analysis between the morphological characters of the bract and leaf showed significant correlations between bract length, bract width, leaf length, and leaf width. In addition, epidermal micromorphological features were very similar. Anatomically, compared with the leaf, there was no differentiation between palisade tissue and spongy tissue in the bracts. Combined with the fossil record of Tilia bracts, we suggest that the bract is specialized from the leaf and may be regarded as a leaf-like structure. The differences in epidermal micromorphological features and anatomical structures are mainly due to adaptations to their different functions during evolution.
彭林林, 夏晓飞, 王奥, 赵良成. 华东椴花序苞片和叶片发育及结构特征比较研究[J]. 植物科学学报, 2019, 37(6): 719-725.
Peng Lin-Lin, Xia Xiao-Fei, Wang Ao, Zhao Liang-Cheng. Comparative study on development and structural characteristics of bracts and leaves of Tilia japonica Simonk. Plant Science Journal, 2019, 37(6): 719-725.
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2019, Vol. 37 
