Page 25 - IPCoSME 2021

1 INTERNATIONAL POSTGRADUATE CONFERENCE ON SCIENCE AND MARINE ENVIRONMENT 2021
st
(IPCoSME 2021)
“Environmental Sustainability Enhancement Through the Collaboration of Sciences”

RB-02

AGRO-PHENOTYPIC, PHYSICOCHEMICAL, AND GENETIC VARIABILITY
ESTIMATION FOR YIELD AND YIELD COMPONENTS OF SWEET POTATO

[Ipomoea batatas (L.) Lam.] GENOTYPES CONSERVED IN MALAYSIA.

1,2
2
NURUL AFZA, K. , AZIZ, A AND THIYAGU, D
1*

1 Faculty of Science and Marine Environment, University Malaysia Terengganu, 21030 Kuala
Terengganu, Terengganu.
2 Industrial Crop Research Centre, Malaysian Agricultural Research and Development Institute
(MARDI) Bachok, 16310 Bachok, Kelantan.

*Corresponding author email: aaziz@umt.edu.my

Abstract: Sweet potato (Ipomoea batatas (L.) Lam.) offers a number of advantages, including

high yield, adaptability, economic value, and nutritional superiority over most staples. To
establish a successful breeding programme, it's crucial to understand the nature and magnitude
of variability among sweet potato genotypes. In this study, a total of 39 sweet potato genotypes
were evaluated for the morphological and physicochemical characteristics. Subsequently, the

degree of variation for the varieties was determined based on quantify genetic variability,
heritability, and genetic advance in terms of growth and yield characteristics. Based on the
dissimilarity distance of 1.0, the hierarchical cluster analysis dendrogram grouped the 39 sweet
potato genotypes into four primary clusters. Ground cover, plant type, twining and vine

internode length, and vine tip pubescence were the most important plant habit features. The
general leaf outline, leaf lobe type, leaf lobe number, and shape of the central leaf lobe were
important traits for leaves. The main character for the storage root is the predominant and
secondary skin and flesh colour. For all traits, results showed that the phenotypic coefficient

of variation (PCV) was larger than the genotypic coefficient of variation (GCV), indicating that
the environment had less influence on their expression. Storage root yield per plant, individual
storage root weight, yield per plot, yield per hectare, and storage root width all had high
heritability (>60 %) and high genetic advance as a percent over mean (>20 %). The results

indicated that the high heritability is attributed to additive gene effects. Sweet potato variety
with those features may be useful in developing appropriate criteria and goals for sweet potato
improvement in breeding programmes. It's also useful for passport data to document the sweet
potato germplasm.

Keywords: sweet potato (Ipomoea batatas (L.) Lam.), morphological, physicochemical,

genetic variability

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