Tobacco expressing PAP1 increases the responses to PAR and UV-A by enhancing soluble sugars and flavonoids and elevating plant protections

Five lines of transgenic tobacco over-expressing production of anthocyanin pigment 1 (pap1) cdna were analysis of metabolic response against the radiation and their protection of the plant under tissue culture condition. pap1 transgenic and wild type (wt) plants were treated with the radiations of photosynthetically activate radiation (par) or par combined with uv-a. all lines of transgenic significantly increased in amounts of p-coumaric acid,naringenin apigenin more than wt under both treatments. additional uv-a radiating to plant rose up kaempferol content in wt plant (1.5 times) and in pap1 transgenics (1.8 times). these transgenic plants treated under both conditions had also increased anthocyanin substances (pelargonidin) with significant value after compared to wt. content of total soluble sugar (tss) was related to the content of total flavonoids in transgenic. par combined with uv-a had a lower induction of the electrolyte leakage percentage and malondialdehyde (mda) level in the transgenic leaf tissue compared to wt tissue. the metabolic substance levels were considered on its protection of plant cells. in transgenic tissue,the enhancement of apigenin level strongly diminished the increase level of electrolyte leakage while the levels of tss,p-coumaric acid and naringinin less affected. moreover,the increase levels of kaempferol and pelargonidin associated with the decrease level of mda,while the tss level reversely responded. the pap1 transgenic increased response of light by adaptation of their metabolites (tss,p-coumaric acid and flavonoids) consequently enhance parameter indicating protections of the cell. © 2015,pakistan botanical society. all rights reserved.