[RESEARCH NOTE]
Trichome Composition of Leaf Domatia as Potential Morphoanatomical Marker of the Four Commercially Viable Coffea Species
Lloyd O. Balinado1,2* and Lourdes B. Cardenas2
1Department of Biological Sciences, College of Arts and Sciences
Cavite State University, Indang, Cavite 4122 Philippines
2Plant Biology Division, Institute of Biological Sciences, College of Arts and Sciences
University of the Philippines Los Baños, Laguna 4031 Philippines
*Corresponding author: This email address is being protected from spambots. You need JavaScript enabled to view it.
ABSTRACT
Trichomes are epidermal extensions that play a role in providing structural defense, affecting photosynthesis, and accumulating secondary metabolites. These trichomes may also occur in leaf domatia – providing various roles for interaction with mites and other arthropods. In the present study, leaf domatia of four Coffea species – namely C. arabica L., C. canephora Pierre ex. A. Froehner, C. liberica Hiern, and C. excelsa A. Chev – were examined for trichome composition. Leaf domatia were observed in all species and were found to be in association with trichomes. Its distribution, on the other hand, interestingly differed among species and could thus serve as a potential morphoanatomical marker. Trichomes in C. arabica were observed to exist around domatia pore, while it forms along the adjacent epidermal tissue in C. canephora. However, no difference was found between C. liberica and C. excelsa. Both exhibited trichome formation within domatia chambers and along the entry point of domatia pore.
One economically important member genus of Rubiaceae is Coffea. It consists of approximately 100 taxa and is mostly grown in the tropical and subtropical regions (Krishnan 2017, Prakash et al. 2015). The Philippines is one of the few countries that produce the four varieties of commercially-viable coffee – namely C. arabica L., C. liberica Hiern (locally known as kapeng barako), C. excelsa A. Chev., and C. canephora Pierre ex A. Froehner (Cao et al. 2014, Mojica 2002). . . . . read more
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