GENETIC VARIABILITY STUDIES OF TWENTY POTATO GENOTYPES
GENETIC VARIABILITY STUDIES OF TWENTY POTATO GENOTYPES
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Date
2012-06
Authors
DANBABA, ANTHONY KUDE
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Abstract
Twenty potato genotypes were evaluated in Randomized Complete Block Design
Replicated three times for their yield potentials and agronomic characteristics. The
experiment was conducted at the Research Farm of the potato programme of National
Root Crops Research Institute, Kuru, Plateau State, during the 2005, 2006 and 2010
cropping seasons. Results showed that the genotypes differed significantly for all the
traits. Five genotypes 375400.00, Desiree, WC732-1, 392278.4, and 676008 were
most promising based on tuber yield and other agronomic traits. Famosa an elite
genotype did not perform better than these promising genotypes. Year effect was
significant for all the traits except plant height while genotype x year interaction was
significant except emergence counts, internodes length, plant height and number of
leaves/plant suggesting the need to evaluate these genotypes for more number of
years. The genotypes were grouped into 5 clusters based on Mahalanobis D2, high
inter-cluster differences were observed between cluster III and V, and IV and V
implies that genotypes in these different cluster groups can be used as parents in
hybridization and expected to give a wide array of segregants. The correlation and
path coefficient analysis indicated higher magnitude genotypic correlation coefficients
than the corresponding phenotypic estimates, thereby indicating that there is strong
inherent association between these characters. Tuber number/plant, showed the
highest positive direct effect on tuber yield. This indicates that tuber number could be
used as indirect selection index for improving tuber yield. Principal component
extracted from the correlation matrix showed that average tuber weight, number of
eyes/tuber and plant height had significant loadings on the first axis. The second axis
shows number of stems had negative significant loading
Description
A THESIS SUBMITTED TO THE POSTGRADUATE SCHOOL,
AHMADU BELLO UNIVERSITY, ZARIA
IN PARTIAL FULFILLMENT OF THE REQUIREMENT FOR THE
AWARD OF THE DEGREE OF MASTER OF SCIENCE (M.Sc.) IN
CROP BREEDING
DEPARTMENT OF PLANT SCIENCE
FACULTY OF AGRICULTURE
AHMADU BELLO UNIVERSITY, ZARIA, NIGERIA.
JUNE, 2011
Keywords
GENETIC, VARIABILITY, STUDIES, TWENTY POTATO, GENOTYPES