Authors:
Jumar Cadondon
1
;
2
;
3
;
Edgar Vallar
1
;
Maria Cecilia Galvez
1
and
Tatsuo Shiina
3
Affiliations:
1
Department of Physics, College of Science, De La Salle University, 1004 Taft Avenue, Manila 0922, Philippines
;
2
Division of Physical Sciences and Mathematics, College of Arts and Sciences-Miagao Campus, Miagao 5023, Iloilo, Philippines
;
3
Graduate School of Engineering, Chiba University, Yayoi-cho, Chiba 263-8522, Japan
Keyword(s):
Philippine Bamboo, Extinction Coefficient, Microstructure, Chlorophyll, TD-OCT.
Abstract:
Bamboo is one of the most utilized non-timber forest products in the Philippines. Common bamboo leaf infections are caused by sunlight, and nutrient deficiency. In this study, we have developed a portable time domain-optical coherence tomography (TD-OCT) to study in vivo leaf microstructure changes in Philippine bamboo (Bambusa spinosa). TD-OCT analysis shows unique features among different layers of the leaves specifically on the epidermis and palisade layers when the unhealthy part is compared to the healthy part. Extinction coefficient from the A-scan analysis showed significant difference from unhealthy part (1.03 ± 0.20 mm-1, N =12, p<0.05) and healthy part (0.72 ± 0.27 mm-1, N =12, p<0.05). In addition, RGB data was compared for both unhealthy and healthy part of the bamboo leaves. A red shift is observed from the unhealthy part of the leaves. It is also observed by a decrease of 60% in chlorophyll-a content of the unhealthy part as compared to the healthy part. Same inverse c
orrelation is also observed when the extinction coefficient is compared with the chlorophyll content.
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