Seasonal variations in cambial anatomy of plantation-grown azadirachta excelsa

Nobuchi T., . and Wang K.H., . and Abdul Azim A. A., . and Sahri M. H., . Seasonal variations in cambial anatomy of plantation-grown azadirachta excelsa. pp. 111-117. ISSN 0128-1283

Tropical trees do not have clear growth rings as they do not show clear radial growth periodicity. It is important to investigate the cambial structure and anatomical characteristics of cells derived from cambium in order to understand the characteristics of radial growth periodicity. A comparison of the anatomical characteristics of cambium in Azadirachta excelsa was carried out between actively and non-actively growing seasons. Wood blocks comprising bark cambium and wood were collected from a living tree. Sections were cut from epoxy-embedded block using a microtome. A periodic acid-Schiffs method was used for staining. The results revealed that the average numbers of cambial and enlarging cambial zone cells varied at different months. During the wet season the cambium formed high number of wood cells. During the dry season from November till February the cambium was inactive. The cambial zone was active for most period of the year. This finding indicates that the cambial growth of A. excelsa is sensitive to environmental factors particularly rainfall.

Full text available from: Official URL: http://www.frim.gov.my/v1/JTFSOnline/jtfs/v25n1/11...

Abstract

Tropical trees do not have clear growth rings as they do not show clear radial growth periodicity. It is important to investigate the cambial structure and anatomical characteristics of cells derived from cambium in order to understand the characteristics of radial growth periodicity. A comparison of the anatomical characteristics of cambium in Azadirachta excelsa was carried out between actively and non-actively growing seasons. Wood blocks comprising bark cambium and wood were collected from a living tree. Sections were cut from epoxy-embedded block using a microtome. A periodic acid-Schiffs method was used for staining. The results revealed that the average numbers of cambial and enlarging cambial zone cells varied at different months. During the wet season the cambium formed high number of wood cells. During the dry season from November till February the cambium was inactive. The cambial zone was active for most period of the year. This finding indicates that the cambial growth of A. excelsa is sensitive to environmental factors particularly rainfall.

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Item Type:	Article
AGROVOC Term:	Azadirachta
AGROVOC Term:	Plant anatomy
AGROVOC Term:	Cambium
AGROVOC Term:	Wood
AGROVOC Term:	Environmental factors
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:26
URI:	http://webagris.upm.edu.my/id/eprint/21228

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