2.2. Phenotype assessment
A total of 26 phenotypic trait data (Table 1) were evaluated during the
vegetative growth of the plants and when tubers were harvested,
including 20 qualitative traits and six quantitative traits. The
observed values of 20 qualitative traits were repeated six times, and
the measured values of six quantitative traits were observed six times
(Table 1). All traits were investigated in accordance with the
description specification and data standard of Chinese yam germplasm
resources
(Huang
and Huang, 2013; Wang and Shen, 2014).