Anatomical and Biochemical Changes Associated with In Vitro Rhizogenesis in Dendrocalamus giganteus

  • R. Yasodha
  • S. Kamala
  • K. Kalaiarasi


Successful micropropagation protocol of a difficult-to-root bamboo species, Dendrocalamus giganteus (10–15 years old) along with the analysis of anatomical and biochemical changes during in vitro rhizogenesis was accomplished. Proliferated axillary shoots from nodal segments of 10–15 years old field culms exhibited shoot necrosis during multiple shoot formation phase and was controlled by subculturing in modified MS liquid medium having 825 mg l−1 NH4NO3, 3800 mg l−1 KNO3, 740 mg l−1 MgSO4 and 9% coconut water, 26.64 μM 6-benzylaminopurine (BA) and 0.46 μM kinetin. These multiple shoots proliferated from field grown culms, failed to root and hence callus was induced on MS solid medium containing 4.44 μM BA, 4.52 μM 2,4-dichlorophenoxyacetic acid (2,4-D) and 5.37 μM naphthalene acetic acid (NAA). Organogenesis from the callus was achieved upon transfer to MS medium with 11.10 μM BA and 2.32 pM kinetin. The callus-derived shoots multiplied on modified MS medium were rooted the best (91%) by culturing 3 days on MS medium having glucose (0.5%), sucrose (2.5%) and 98.41 μM indolebutyric acid (IBA) and subsequently to IBA-free MS medium containing 3% sucrose. Studies on peroxidase and IAA oxidase activity and endogenous free- and bound-IAA content showed that IAA oxidase and peroxidase oxidize endogenous IAA resulting in root initials formation. Anatomical studies confirmed the root primordia formation from 3rd day of IBA treatment and primordia were visible over the surface on 8th to 10th day. However, the shoot necrosis symptoms which started on 6th day of treatment intensified by 10th day leading to the death of the whole shoot system by 12th–15th day. Nevertheless, on the root formation medium with 9.84 μM IBA, new shoot buds were emerged and showed shoot growth in 60% of the rooted cultures, which were successfully acclimatized in shade-house with 100% survival. The present study establishes rooting of callus-derived shoots as the best way for the successful propagation of the difficult-to-root bamboo, D. giganteus when compared to axillary bud proliferated shoots.

Key words

Dendrocalamus giganteus indirect organogenesis proxidase IAA oxidase endogenous IAA carbon source shoot necrosis rhizogenesis 





naphthalene acetic acid


indole acetic acid


indole butyric acid


2,4-Dichlorophenoxy acetic acid


Murashige and Skoog


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Copyright information

© Springer 2010

Authors and Affiliations

  1. 1.Division of Plant BiotechnologyInstitute of Forest Genetics and Tree Breeding, R.S. PuramCoimbatoreIndia

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