ALTERNATIVE CLONAL PROPAGATION OF DRYOBALANOPS BECCARII AND D. RAPPA
- Resource Type
- research-article
- Authors
- Jong, LK; Sani, HB
- Source
- Journal of Tropical Forest Science, 2012 Apr 01. 24(2), 275-284.
- Subject
- Plant cuttings
Branches
Tree stumps
Bending
Plant roots
Trees
Forest growth
Rooting
Plants
Forestry
- Language
- English
- ISSN
- 01281283
Application of rooted cuttings derived from epicormic shoots from mature trees of Dryobalanops beccarii and D. rappa in current tree propagation and improvement programmes is suggested and discussed. Development of epicormic shoot indicated partial rejuvenation which was exhibited by plagiotropic growth habit, adult leaf morphology and delayed bud flushing of rooted cuttings. The juvenility of epicormic shoots showed that the 'ageing' component of cyclophysis had been reversed by the 'maturation' component which remained unaltered. The incomplete rejuvenation was further demonstrated by poor rooting of cuttings derived from epicormic shoots. The potential of using these characteristics as possible markers of juvenility and maturity is also discussed. Cuttings derived from epicormic shoots from the stump of D. beccarii and D. rappa rooted more readily than those from other parts of the tree bole. It was suggested that epicormic shoots obtained from stumps were more juvenile than those from upper part of the stem. This phenomenon, described as topophysis, supported the theory that maturation occurred in different phases. Artikel ini mencadang serta membincangkan aplikasi keratan berakar yang dihasilkan daripada pucuk epikormik pokok Dryobalanops beccarii dan D. rappa matang dalam program pembiakan dan penambahbaikan pokok. Pembentukan pucuk epikormik menunjukkan rejuvenasi separa yang dipamerkan melalui tabiat pertumbuhan plagiotropik, morfologi daun dewasa serta pengeluaran tunas daun yang lewat pada keratan berakar. Kejuvenilan pucuk epikormik menunjukkan bahawa komponen penuaan siklofisis telah diterbalikkan oleh komponen kematangan yang kekal tidak berubah. Rejuvenasi yang tidak lengkap ini turut ditunjukkan oleh pengakaran yang kurang pada keratan yang dihasilkan daripada pucuk epikormik. Potensi menggunakan ciri-ciri ini sebagai penanda kejuvenilan serta kematangan turut dibincangkan. Keratan yang dihasilkan daripada pucuk epikormik tunggul D. beccarii and D. rappa beraka lebih cepat berbanding bahagian lain batang pokok. Kami mencadangkan bahawa pucuk epikormik yang diperoleh daripada tunggul menunjukkan lebih banyak sifat juvenil berbanding bahagian batang pokok yang lebih tinggi. Fenomena ini yang dinamakan sebagai topofisis menyokong teori yang menyatakan bahawa kematangan berlaku dalam fasa-fasa yang berbeza.