SILVA FILHO, P. S. L.; SILVA FILHO, Paulo Sérgio de Lima.
Resumo:
The Cajanus cajan, popularly known as pigeonpea was introduced in Brazil since the slavery
times, utilized as green manure, human alimentation and animal alimentation. Being from
Fabaceae family, subfamily Faboideae, is considered a shrub legume, or semi-perennial. Was
aiming to its importance for the tropics and subtropics that in the current project aimed
objective of this study was to carcaterize and verity the existence of genetic diversity among
pigeonpea (Cajanus cajan) basead on quantitative and qualitative descriptors in a germoplasm
bank formed by accessions collected in the Cariri region in Paraiba state. All 22 accessions of
the pigeonpea germplasm bank were evaluated the completely randomized design (CRD) with
the plot consisting of one plant per pot. It was also performed for these characters, the
grouping test of means, according to Scott Knott proposed in 1974, to 5% of probabilty. The
clustering method by the mean link between groups (UPGMA) was applied using the
generalized mahalanobis distance (D2) (quantitative characters) and the average Euclidean
distance (qualitative characters), as a measure of dissimilarity. The relative importance of the
evaluated characters regarding the genetic dissimilarity observed between the genotypes was
realized following the methodology employed by Morais and collaborators in 1998 and
through the participation of D2 components, related to each trait, in the total dissimilarity
observed. There is a wide genetic variability among the guandu bean accessions, and easily
identified by morphoagronomic characters. G-LI/10-F18 and G-CON/11-F18 accessions are
very likely to be duplicated, which should be molecularly confirmed. Seed-related characters
allow easy identification of morphological genetic diversity. Nine intersections were
identified as the most promising, namely: G-CA/18-M18 x (G-SU/02-J18, G-ZA/05-J18, GOV/22-M18,
G-MO/04 -J18, G-PA/16-M18 and G-SJ/09-F18); G-PA/16-M18 x (G-SJ/09F18
and G-AM/19-M18) and the intersection between access G-SB/14-F18 and G-AM/19-M18.