Leaf Dvelopment and Its Ecological Adaptability of Cercidiphyllum japonicum
Using the paraffin-section method,we studied the morphological variations and its ecological adaptability of Cercidiphyllum japonicum,based on the developmental regularities and difference between the immature leaf and mature leaf in anatomical structure.Leaf development were existed in three stages of leaf margin curl inward,expand and mature stage.The first and second pair immature leaves base have a well developed membranous sheath,with the most developed sheath on the first pair immature leaves and more developed sheath on the second,but not found on the others.The leaf of C.japonicum is typical bifacial leaf with developed spongy parenchyma,outer convex stoma apparatus in the upper and lower epidermis,developed cuticle,vein,mechanical tissue,a amphicribral vascular bundle in min-petiole and bundle sheaths,and the C.japonicum is with strong ecological adaptability to the drought and humid conditions.There are more ergastic substance stored in vegetative organs,which can offer the main nutrition for organ during in breeding season.The first pair immature leaves with faster growth rates also satisfy little nutritional requirements for other organ development.
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