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《Scientia Silvae Sinicae》 1980-02
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INTERCALARY MERISTEM AND INTERNODAL ELONGATION OF BAMBOO PLANTS

Xiong Wen-yu Ding Zu-fu Li Yon-fen(Nanjing Technological College of Forest Producls)  
During the period of March-June, 1978, the shoot growth of phyllostachys pubcs-ccns, Ph. praccox, Ph. nigra var. henonis, Ph. glauca and Ph. viridis were observedand measured daily. Of the first two species a young vigorous shoot for each was takento make slides with a conventional microtomic method. Results obtained are given asfollows: 1. The height growth of a bamboo shoot results mainly from the elongation orinternodes which occurs neither at same time nor at same speed. The internodalelongation begins at the basal portion of the shoot where a number of elongating in-ternodes, 14-16 for Ph. pubcscens and 10-12 for Ph. praccox form an elongatingzone and then gradually procced upward to the top in accordance with the slow-quick-slow pattern of growth. This pattern is also followed by elongating activity of indi-vidual internodes. 2. The apical meristematic zone of a bamboo shoot is pyramidal in shape and canbe clearly divided into a top part (apical meristem) and a lower part (subapical meris-tem). The former consists of tunica-corpus and thee later is derived from meristematictissue with differentiated sheath (leaf) primordia and procambia (provascular bund-les). 3. As the shoot growth advances, some of provaseular bundles bccome curveddiatropically at the position of young sheath and transverse aeross the pith to initiatea new node. This newly initiated node can be recognized as the lower demarcation ofthe apical meristematic zone. 4. According to the literature related, an intercalary meristem is an inserted me-ristematic tissue in the mature tissue. As seen in bamboo shoots, it is dircctly de-rived from the apical meristem and is separated into a number of intercalary sectionsby successively formed nodes. 5. The procambium further differentiates into phloem and xylem. Consequentlythe former develops into sieve tubes and companion cclls and the later into vesselsand fiber cclls. All these differentiated elements are morphologically distributed andembedded in the intercalary meristem where they divide continuously to produce thesaune elements. Thus, vascular systems aree not interrupted, though nodes separate themeristem into a number of intercalary zones.
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