Characterization of genetic diversity in three guava (Psidium guajava L.) populations
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Abstract
important fruit tree in several countries, where breeding
programs are being developed with different objectives.
Evaluations on the genetic variability of crop germplasm
collections have been performed in some of these countries;
however, the variability present in guava populations had not
been evaluated so far. Ten quantitative morphoagronomic
traits were assessed for three years in parents and progenies
of three guava populations, with the aim of characterizing
the genetic diversity of such populations derived from
controlled crossings. Main component analysis clusters
and discriminant factorials were made in order to determine
the highest variability characters that allow making up
diversity groups and confirming if there are differences
among them. Significant differences were also determined
among populations for the characters: leaf length and width,
plant height, fruit length and width, external and internal
pulp thickness, and seed number per fruit. Fruit characters
were the greatest contributors to the variability observed.
Regarding dendrograms obtained, four diversity groups
were formed in each population, mainly based on fruit mass,
length and width, seed number and its total mass per fruit.
All the results allowed detecting high population variability
for the traits evaluated.
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