The Effect Of Enviramental Factor On Growth And Photosynthesis Of Stem Mustard

Effect of salicylic acid (SA) on the physiological and biochemical changes in turnip mosaic virus (TuMV) infected stem mustard, and changes in photosynthesis and chlorophyll fluorescence in cytoplasmic male sterile stem mustard (Brassica funcea var. tsatsai), were studied in this experiment. The main results are as follows:Stem mustard growth was reduced by TuMV infection, and photosynthetic rate decreased after inoculation of turnip mosaic virus (TuMV). The qP and qN also declined, indicating that the ability of photochemical reaction reduced. The reduction of Fv/Fm ratio and Fv/Fo ratio showed that the photochemical activity and maximal quantum efficiency of PS II photochemistry declined. Plant biomass decreased after TuMV infection. Meanwhile, SA treatment increased the net photosynthetic rate as well as the antioxidative enzyme activities of CAT, APX, G-POD in stem mustard.The cytoplasm male sterile (CMS) plants always showed a weak leaf growth compared with its mantainer lines. While the diurnal changes of photosynthetic rate in CMS plants were always lower when compared to its mantainer lines, although they showed the same trends.