Abstract:

To compare the photosynthetic characteristics of different variation types of konjac and provide reference for its genetic improvement, different color petioles variation types of Amorphophallus konjac(black, white, red and cyan, referred to as black, white, red and green konjac) were used as materials, A. albus and ‘E konjac No.1’ as control, to compare their photosynthetic differences using Li-6400 portable photosynthetic apparatus. The results showed that there were some differences in photosynthetic capacity of different konjac materials. Pn-PAR and Pn-CO₂ response curves of konjac were consistent on the whole, but the degree was different. The light saturation point and light compensation point of the 6 konjac materials were obtained from the response curves ranging from 955 to 1191 μmol/(m^2·s), and the light compensation point ranged from 1.51 to 47.05 μmol/(m²·s). The apparent quantum efficiency ranged from 0.0235 to 0.0415. The CO₂ saturation point was 1528-1948 μmol/mol, the CO₂ compensation point (CCP) was 35.20-96.67 μmol/mol, and the carboxylation efficiency was 0.0203-0.0340. The photosynthetic performances of ‘E konjac No.1’, black konjac and green konjac were better.

Key words: Amorphophallus konjac, variation types, photosynthetic characteristics, daily variation, response curve