Abstract: By using CI-301PS photosynthesis system, the main photosynthetic parameters of 152 sugarcane genotypes were measured. The results showed that differences of photosynthetic characters among the tested varieties were extreme significant. Cluster and discrimination analysis techniques were used to study photosynthetic characters of 152 different varieties of sugarcane. Cluster analysis was used to classify the photosynthetic characters of sugarcane varieties and 152 different genotypic varieties of sugarcane were classified into 7 groups according to these indexes, then by means of discrimination analysis, photosynthetic character indexes (Pn, E, WUE) had significant effects on classification were selected and 7 discrimination models with better distinguishing abilities were established.

Key words: Sugarcane (Saccharum officinarum L.), Photosynthetic characters, Quality classification, Cluster analysis, Resources