Normal view MARC view ISBD view

Determination of widely adaptable coconut (Cocos nucifera L.) genotypes based on soil and climatic factors / by Millicent C. Ilagan

By:

Ilagan, Millicent C [author]

Contributor(s):

Sangalang, Juanito B [adviser]

Material type: Text

TextLanguage: English Publication details: Los Baños, Laguna : 1987. Cavite State University- Main Campus,Description: 111 pages : illustrations ; 28 cmContent type:

text

Media type:

unmediated

Carrier type:

volume

Subject(s):

DDC classification:

634.61 Il1 1987

Online resources:

Click here to view thesis abstract and table of contents

Abstract: MILLICENT C. ILAGAN. University of the Philippines at Los Banos, College, Laguna. March 1987. Determination of Widely Adaptable Coconut (Cocos nucifera L.) Genotypes Based on Soil and Climatic Factors. Major Adviser: Dr. Juanito B. Sangalang An evaluation for the general adaptability of nine coconut genotypes commonly grown in three research stations of the Philippine Coconut Authority was conducted to determine the environmental factors that greatly influence the yield and range of adaptability of the coconut genotypes and to identify the widely adaptable coconut hybrids/cultivars from among the nine genotypes. To meet these objectives, various statistical procedures were used, namely, simple correlation analysis, step-wise regression technique and the beta response methodology which utilized the principal component analysis. Four environmental variables such as annual amount of rainfall, minimum temperature, % silt and % clay were identified as the most important factors affecting yield variation and the range of adaptability of coconut. These variables were used in the derivation of an environmental index which in turn was utilized in the identification of widely adaptable genotypes by the beta response methodology. The instability rankine of the different coconut genotypes revealed that the hybrids ar2z more adaptable to varying environments than the local cultivars. In particular, two foreign hybrids, Yellow Malayan Dwarf x West African Tall (YMD x WAT) and the Equatorial Green Dwarf (GDE) x WAT ranked as the most adaptable genotypes. This result confirmed earlier claim of coconut scientists that these hybrids are suited to a wider range of environments. At the same time, our local hybrid, Catigan x Bago-oshiro (CAT x BAO) showed promising potential which is comparable to the foreign ones. The higher general adaptability of the hybrids could be due not only to their physiological homeostasis, and phenotypic plasticity but also to the heterogeneity and heterozygosity of its gene: constitution. Based on the findings of this study, the choice of YMD x WAT and other foreign hybrids as planting materials for the initial implementation of the coconut replanting program proved to be justifiable. Likewise, the CAT x BAO hybrid is worth considering for recommendation to our coconut farmers. The results also indicate that more coconut genotypes must be evaluated for their general adaptability considering the wide genetic variability of this crop. Furthermore, the need to identify promising genotypes for recommendation to coconut farmers should be given high priority by our government.

Average rating: 0.0 (0 votes)

Holdings ( 1 )
Title notes ( 4 )

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	634.61 Il1 1987 (Browse shelf(Opens below))		Link to resource	Room use only	T-1347		00002274

Thesis (M.S. - - Plant Breeding) University of the Philippines, College, Laguna.

Includes bibliographical references.

MILLICENT C. ILAGAN. University of the Philippines at Los Banos, College, Laguna. March 1987. Determination of Widely Adaptable Coconut (Cocos nucifera L.) Genotypes Based on Soil and Climatic Factors. Major Adviser: Dr. Juanito B. Sangalang

An evaluation for the general adaptability of nine coconut genotypes commonly grown in three research stations of the

Philippine Coconut Authority was conducted to determine the environmental factors that greatly influence the yield and range of adaptability of the coconut genotypes and to identify the widely adaptable coconut hybrids/cultivars from among the nine genotypes. To meet these objectives, various statistical procedures were used, namely, simple correlation analysis, step-wise regression technique and the beta response methodology which utilized the principal component analysis.

Four environmental variables such as annual amount of rainfall, minimum temperature, % silt and % clay were identified as the most important factors affecting yield variation and the range of adaptability of coconut. These variables were used in the derivation of an environmental index which in turn was utilized in the identification of widely adaptable genotypes by the beta response
methodology.

The instability rankine of the different coconut genotypes revealed that the hybrids ar2z more adaptable to varying environments than the local cultivars. In particular, two foreign hybrids,

Yellow Malayan Dwarf x West African Tall (YMD x WAT) and the Equatorial Green Dwarf (GDE) x WAT ranked as the most adaptable genotypes. This result confirmed earlier claim of coconut scientists that these hybrids are suited to a wider range of environments. At the same time, our local hybrid, Catigan x Bago-oshiro (CAT x BAO) showed promising potential which is comparable to the foreign ones. The higher general adaptability of the hybrids could be due not only to their physiological homeostasis, and phenotypic plasticity but also to the heterogeneity and heterozygosity of its gene: constitution.

Based on the findings of this study, the choice of YMD x WAT and other foreign hybrids as planting materials for the initial implementation of the coconut replanting program proved to be justifiable. Likewise, the CAT x BAO hybrid is worth considering for recommendation to our coconut farmers. The results also indicate that more coconut genotypes must be evaluated for their general adaptability considering the wide genetic variability of this crop. Furthermore, the need to identify promising genotypes for recommendation to coconut farmers should be given high priority by our government.

Submitted to the University Library 01/07/1994 T-1347