Photosynthetic Pigment Content, Phenol and Flavonoid Concentration, and Defense Enzyme Activity of Oriental Lily (Lilium auratum L. cv. Sorbonne) Infected with Lily Mottle Virus

摘要

The effects of Lily mottle virus (LMoV) infection were determined on the photosynthetic pigment content, total phenol and flavonoid concentration, and the activities of defense enzymes including peroxidase (POD), polyphenol oxidase (PPO), superoxide dismutase (SOD) and phenylalanine ammonia lyase (PAL) of oriental lily (Lilium auratum L. cv. Sorbonne). Compared with the healthy control, the chlorophyll content varied in the LMoV-infected plants. The levels of chlorophyll a (Chl a), chlorophyll b (Chl b) and total chlorophyll (Chl a+b) in the LMoV-infected plants were either not significantly different from the control, or were significantly decreased. The effect of LMoV infection on carotenoid levels was rather variable. Moreover, total phenol and flavonoid concentration were significantly enhanced after LMoV infection, and significantly higher POD activity was observed in all the LMoV-infected plants. Significantly higher PPO, SOD and PAL activity was noted only in partly LMoV-infected plants. Furthermore, when the LMoV CP gene copies ranged between negative and 1.24x10(-5), a quadratic relationship was confirmed between the values for the LMoV CP gene copies and the photosynthetic pigment content, total phenol and flavonoid concentration. Our results indicate that the reduced proliferation of viral gene copies decreased the damage of disease to some extent.