Morphological Characterization and Selection of Spider Plant (Cleome Gynandra) Accessions from Kenya and South Africa uri icon

abstract

  • Characterization of selected spider plant accessions from Kenya and South Africa was performed in orderto individuate those with distinct morphological traits for future improvement programs. For this purpose, thirty twoaccessions of spider plant, 23 sourced from Kenyan genebank and nine sourced from South African genebank, wereplanted at the University of Nairobi?s Kabete field station, in a randomized complete block design with 3replications. Eleven morphological traits based on modified FAO (1995) spider plant descriptors were used incharacterization. Traits evaluated were growth habit, flower colour, stem colour, stem hairiness, petiole colour,petiole hairiness, leaf colour, leaf pubescence, leaf shape, leaf blade tip shape, and number of leaflets per leaf. Thescored data were analyzed using DARwin software v6 and Genstat v14. Shannon diversity index (H?), multivariatemethods of principal component analysis and hierarchical clustering analyses of unweighted pair group method ofarithmetic mean were assessed for all the traits. Estimates of Shannon-Weaver diversity index (H?) for themorphological traits were generally high (H?>0.500). The H' index indicated inter-country diversity to be greaterthan the intra-country diversity. Principal component analysis identified seven important morphological traits (stemcolour, stem hairiness, petiole colour, petiole hairiness, leaf hairiness, leaf shape and number of leaflets per leaf) forcharacterizing spider plant accessions. The hierarchical cluster analysis revealed two major clusters (Cluster I and II)for the 32 accessions grown, with clustering of accessions occurring along regional basis. Cluster I consisted ofSouth African accessions only while cluster II had mainly Kenyan accessions and two South African accessions.The relatively high levels of dissimilarity revealed in this study among the accessions for traits evaluated, especiallyaccessions from the two different countries, indicates high prospects for genetic improvement of the crop throughcross breeding by using materials from different geographical origins

publication date

  • 2015