Genetic diversity characterization of cassava cultivars (Manihot esculenta Crantz).: I) RAPD markers

• Main Authors: Colombo Carlos, Second Gérard, Valle Tereza Losada, Charrier André
• Format: Article
• Language: English
• Published: Sociedade Brasileira de Genética 1998-01-01
• Series: Genetics and Molecular Biology
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47571998000100018

RAPD markers were used to investigate the genetic diversity of 31 Brazilian cassava clones. The results were compared with the genetic diversity revealed by botanical descriptors. Both sets of variates revealed identical relationships among the cultivars. Multivariate analysis of genetic similarities placed genotypes destinated for consumption "in nature" in one group, and cultivars useful for flour production in another. Brazil?s abundance of landraces presents a broad dispersion and is consequently an important resource of genetic variability. The botanical descriptors were not able to differentiate thirteen pairs of cultivars compared two-by-two, while only one was not differentiated by RAPD markers. These results showed the power of RAPD markers over botanical descriptors in studying genetic diversity, identifying duplicates, as well as validating, or improving a core collection. The latter is particularly important in this vegetatively propagated crop.