Capacidades fisiológicas e produção de matéria seca de acessos de batata-doce

Abstract

There are several factors that affect the substance or chemical such as a physical deficit, thermal stress, internal and external gas concentration and light intensity, however, it can also vary with the evaluated genetic or cultivar material. The objective of this study was to evaluate the physiological characteristics of seventy-seven sweet potato genotypes (Ipomoea batatas) and to group them according to their physiological and dry matter production. For this purpose, a randomized block disassembly (DBC) test was established. As physiological comments were made 60 days after the transplantation of the sweet potato seedlings in the most expanded leaves counted from the apical meristem of the longer branch. A non-infrared gas analyzer (IRGA) was used. The use of this device was evaluated: the concentration of sub-static CO2 (Ci) and the photosynthetic rate (A), stomatal conductance of water vapors (Gs), transpiration rate (E), water use efficiency (USA) and the ratio Ci / atmospheric carbon (Ci / Ca). At 150 days after transplanting, the total dry matter mass of the plants (MST) was determined. The evaluated sweet potato genotypes presented different behavior in relation to the different physiological characteristics studied. Higher values of A, Gs, Ci, Ci / Ca and E were observed in UFVJM-57, but UFVJM-06 showed the lowest values in relation to these characteristics.