Estudo da interação genótipo x ambiente da composição físico-química de raízes de feijão-macuco (Pachyrhizus spp.) na Região Amazônica

Abstract

Yam bean is an Amazonian species, which yields toxic seeds and edible tuberous roots. Yet, It is still unknown whether the Amazonian environments influence in physical-chemical composition of roots. Thus, this work aimed to evaluate genotype x environment interaction (GxE) in 56 yam bean genotypes. They were carry out in nonflooded land (Manaus-AM) and flooded land (Iranduba-AM) without flower pruning. In each local, the experiment followed the completely random design with three blocks and eight plants per plot, spaced 1 x 0.5 m between rows and plants respectively. The evaluated characteristics were: root yield, dry matter, ash, protein; coloration and pH. The findings indicate there to be interaction GxE for all of them. For root yield, the most adapted genotype to nonflooded land was P13 (33.16 t ha- 1), and to flooded land was P49 (9.95 t ha-1). The most stable genotypes were P49 (nonflooded land = 9.69 t ha-1 and floodplain = 9.95 t ha-1) and P24 (nonflooded land = 11.23 and floodplain = 9.20 t ha-1). Therefore, the environment influences the nutritional quality of roots. New tests should to be carry out in nonflooded land with P13, P49 and P24 genotypes and in flooded land with the two last genotypes.