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Morphological characterization of coffea liberica and coffea excelsa at the Cavite State University Indang, Cavite / by Mabell N. Amiscosa.

By:

Amiscosa, Mabell N [author]

Contributor(s):

Baltazar, Miriam D [adviser]

Material type: Text

TextLanguage: English Publication details: Indang, Cavite : Cavite State University- Main Campus, 2019.Description: xiv, 84 pages : illustrations ; 30 cmContent type:

text

Media type:

unmediated

Carrier type:

volume

Subject(s):

DDC classification:

633.571 Am5 2019

Online resources:

Click here to view abstract and table of contents

Production credits:

College of Arts and Sciences (CAS), Department of Biological Sciences

Abstract: AMISCOSA, MABELL N. Morphological Characterization of Coffea liberica and Coffea excelsa at the Cavite State University Indang, Cavite. Undergraduate Thesis Bachelor of Science in Biology, Cavite State University, Indang Cavite. June 2019. Adviser. Miriam Du Baltazar, PhD. Morphological characterization is a traditional method used by researchers and coffee breeders to assess genetic diversity in a population. Coffee is one of the most significant non-alcoholic beverage crops cultivated in over 80 countries around the globe. Coffea liberica (C. liberica Heirn) and Coffea excelsa (C. liberica var. dewevrei) were the most controversial coffee species in genus Coffea, and have been confusing many farmers and researchers, due to contradicting evidences from different parameters. Some researchers claimed that C. liberica and C. excelsa were separate species and other claimed that C. excelsa was a variety of C. liberica Heirn, due to inconsistency of traits in the field. In this study, a total of 7 C. liberica, 38 C. excelsa, and 13 unclassified accessions obtained from the Cavite State University Indang, Cavite were morphologically characterized using 27 descriptors retrieved from IPGRI descriptors for Coffea and Psilanthus, focusing only on the leaves, flowers, fruits and seeds of the samples. Genetic variation and diversity of C. liberica and C. excelsa accessions were assessed and analyzed using Shannon-Weaver Diversity Index (SWDI) and Pearson Correlation Coefficient, and organized into a matrix using UPGMA dendrogram. Classification of the accessions was based on the characterization of traits in accordance with the methodology of N’Diaye et al, 2005. Based on the results of descriptive statistics, significant variation was observed in 27 traits, from among fifty- eight accessions evaluated. The grand mean SWDI of both species were H’=0.79, and H’=0.73, which indicates a high level of diversity in the sample collections, only the flower color trait shows no variation at all (H’=0). Clustering analysis bared four clusters from the 58 coffee accessions, and the species does not grouped separately due to their overlapping traits. In the correlation coefficient analysis of traits, 84% had weak correlations while 7% had moderate correlations; there is a strong positive correlation between flower characters which is expected, among all the traits evaluated. These traits that had moderate to high correlations could be used as a basis for the utilization of germplasm for breeding purposes as well as for planning future collection trips targeting specific traits.

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Holdings ( 1 )
Title notes ( 5 )

Holdings
Item type	Current library	Collection	Call number	Materials specified	URL	Status	Notes	Date due	Barcode
Theses / Manuscripts	Ladislao N. Diwa Memorial Library Theses Section	Non-fiction	633.571 Am5 2019 (Browse shelf(Opens below))		Link to resource	Room use only	T-8538		00002762

Thesis (Bachelor of Science in Biology Major in General Biology) Cavite State University.

Includes bibliographical references.

College of Arts and Sciences (CAS), Department of Biological Sciences

AMISCOSA, MABELL N. Morphological Characterization of Coffea liberica and Coffea excelsa at the Cavite State University Indang, Cavite. Undergraduate Thesis Bachelor of Science in Biology, Cavite State University, Indang Cavite. June 2019. Adviser. Miriam Du Baltazar, PhD.

Morphological characterization is a traditional method used by researchers and coffee breeders to assess genetic diversity in a population. Coffee is one of the most significant non-alcoholic beverage crops cultivated in over 80 countries around the globe.

Coffea liberica (C. liberica Heirn) and Coffea excelsa (C. liberica var. dewevrei) were
the most controversial coffee species in genus Coffea, and have been confusing many farmers and researchers, due to contradicting evidences from different parameters. Some researchers claimed that C. liberica and C. excelsa were separate species and other claimed that C. excelsa was a variety of C. liberica Heirn, due to inconsistency of traits in the field. In this study, a total of 7 C. liberica, 38 C. excelsa, and 13 unclassified accessions obtained from the Cavite State University Indang, Cavite were morphologically characterized using 27 descriptors retrieved from IPGRI descriptors for Coffea and Psilanthus, focusing only on the leaves, flowers, fruits and seeds of the samples. Genetic variation and diversity of C. liberica and C. excelsa accessions were assessed and analyzed using Shannon-Weaver Diversity Index (SWDI) and Pearson Correlation Coefficient, and organized into a matrix using UPGMA dendrogram.

Classification of the accessions was based on the characterization of traits in accordance with the methodology of N’Diaye et al, 2005. Based on the results of descriptive statistics, significant variation was observed in 27 traits, from among fifty- eight accessions evaluated. The grand mean SWDI of both species were H’=0.79, and H’=0.73, which indicates a high level of diversity in the sample collections, only the flower color trait shows no variation at all (H’=0). Clustering analysis bared four clusters from the 58 coffee accessions, and the species does not grouped separately due to their overlapping traits. In the correlation coefficient analysis of traits, 84% had weak correlations while 7% had moderate correlations; there is a strong positive correlation between flower characters which is expected, among all the traits evaluated. These traits that had moderate to high correlations could be used as a basis for the utilization of germplasm for breeding purposes as well as for planning future collection trips targeting specific traits.

Submitted to the University Library 09-18-2019 T-8538