TITLE:
Assessment of Genetic Variability of 142 Sweet Sorghum Germplasm of Diverse Origin with Molecular and Morphological Markers
AUTHORS:
A. Lekgari, I. Dweikat
KEYWORDS:
SRAPs, SSRs, Energy Crops, Genetic Distance
JOURNAL NAME:
Open Journal of Ecology,
Vol.4 No.7,
May
27,
2014
ABSTRACT: Sorghum bicolor (L.) Moech is the fifth most important crop in the
world. Recently, its agronomics and genetics have drawn interest among
scientists. Sweet sorghum, a variety of sorghum, may potentially become a
bioenergy source because of the high sugar content in its juicy stems.
Exploring the diversity of sweet sorghum around the world is important to the
development and improvement of the crop as an energy source. In exploring the
diversity of sweet sorghum, three types of markers (simple sequence repeats [SSR],
sequence-related amplified polymorphisms [SRAP], and morphological markers) are
used on 142 sweet sorghum accessions from around the world. The accessions show
a high significance (P showing
these traits to explain 92.5% of the total variation. The furthest accessions
were PI571103 from Sudan, and N99 from the United States. The Nei’s
genetic standard distances ranged from 0.024 to 1.135 and 0.078 to 0.866 for
SSR and SRAP, respectively. As expected, accessions of the same origin or
breeding history had the lowest genetic distance (e.g. Mokula and Marupantse,
both from Botswana; NSL83777 and NSL83779 from Cameroon). Neighbor joining
clusters the sweet sorghum accessions into five major groups using SSR and four
major groups using SRAP, based on their origin, or breeding history. The three
marker types complement each other, and the presence of accessions of different
origins across clusters indicate similar genetics, and evidence of germplasm
movement between countries.