Chlorophyll fluorescence characteristics of Phyllostachys edulis during its fast growth period

To explore chlorophyll fluorescence characteristics of a Phyllostachys edulis blade during its fast growth period (early, middle, and late phases), parameters concerning chlorophyll fluorescence of a Ph. edulis blade were measured using PAM-2100 chlorophyll fluorescence spectrometer during its fast growth period of the Bamboo Physiological and Ecological Monitoring Station of Zhejiang A & F University, also comprehensive evaluation of its fluorescence characteristics was then conducted. The results showed that the actual photochemical quantum yield of Photosystem Ⅱ (PS-Ⅱ), the maximal photochemical efficiency of PS-Ⅱ (Fv/Fm), and the potential PS-Ⅱ activity for same-aged Ph. edulis samples had significant differences within different stages of the rapid growth period (P < 0.05) going from a lower level to a higher level for the early phase, the middle phase, and the latter phase. Variation in the Fv/Fm ratio was 0.672-0.773 and in the Fv /Fo ratio was 2.068-3.231. During the fast grwoth period, the value of Non-photochemical Quenching(qNP) in the order: middle phase < late phase < early phase. The qNP value also showed strong daily variation during different phases of the fast growth period. Chlorophyll fluorescence parameters of bamboo blade show significant changes during its fast growth period. Thus, as indicated by the comprehensive comparison, photosynthesis of the Ph. edulis blade showed an increasing tendency during its rapid growth.