J Integr Plant Biol. ›› 1985, Vol. 27 ›› Issue (4): -.

• Research Articles •    

Comparative Wood Anatomy of Three Species of Normal and Dwarf Pines

Li Zheng-li (Lee Cheng-lee) and Zhang Xin-ying   

Abstract: Wood structure of three species of normal and dwarf pines, i.e. Pinusthunbergii, P. tabulaeformis and P. densiflora, were comparatively studied. The degreesof breadth of annual rings vary in all three species, whether normal or dwarf. In general, after the initiation of growth annual rings gradually increased in breadth andreached maximum by the 3td or 4th year, and then decline to a certain degree of breadthin subsequence. However, the annual rings of normal pines are wider than those ofdwarf pines. There are many false annual rings mingled with annual rings in dwarfpines. The length and breadth of tracheids exhibited remarkable variation among annualrings. Normal pine tracheida are longer and wider than those of dwarf pine and thedifferences of breadth are more significant. Nevertheless there is no correlation between the width of annual rings and the length or breadth of tracheids. These findingsmight indicate that a favorable growth condition not only can promote the growth of:pines but also can avert tracheids shortening.

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