Morphological characteristics and genetic diversity of some varieties of Morinda officinalis How

Abstract

Our research on Morinda officinalis How aim to using morphological
characteristic and DNA barcode for species identification base on 11 types
of Morinda officinalis How in 6 Northern provices of Vietnam. Varieties of
Morinda officinalis How have cylindrical stem shape, young stem with
green color and zigzag cylindrical root shape and wood pith with thorn.
Differentiation of hair on the surfaces of stem and leaves, leaves shape and
basal shoot color are considered as morphological characteristic
identification between varieties. Varieties BK7, BK8, BK9, BK10, BK11
show green basal shoot whereas others varieties show purple. BK9 show
green basal shoot and contains hairs in under leaves only while BK5
contains no hair. White flower of Morinda officinalis How can change to
yellow. Fruit of BK2 is simple fruit, fruit of BK7 is more convergence,
green when young and yellow red when ripen while other varieties is
multiple fruit. Result of rDNA barcoding, identification of ITS region and
phylogeny construction show closely related of 9 varieties except for BK2
and BK9. Based on the classification tree, ITS-rADN region sequence of 11
varieties of Morinda officinalis How was divided into 2 main groups Group
1 including ITS-rADN region sequence of BK2. Group 2 consists of ITSrADN region sequences of the remaining 10 varieties divided into 2
subgroups. In that group 2.1, there are only BK9 samples, while 9 samples
in group 2.2 are BK5, BK6, BK7, BK8, BK4, BK1, BK3, BK10 and BK11.