Treatment with Methyl Jasmonate Alleviates the Effects of Paraquat on Photosynthesis in Barley Plants |
| |
Authors: | Hristova V.A. Popova L.P. |
| |
Affiliation: | (1) Bulgarian Academy of Sciences, Acad. M. Popov Institute of Plant Physiology, Acad. G. Bonchev Str., bl. 21, 1113 Sofia, Bulgaria |
| |
Abstract: | Twelve-day-old barley seedlings were supplied with 23 M methyl jasmonate (MeJA) or 10 M paraquat (Pq) via the transpiration stream and kept in the dark for 24 h. Then they were exposed to 100 mol m–2 s–1 PAR and samples were taken 1, 2, 3, and 6 h after irradiation. Treatment of seedlings with MeJA alone resulted in decreased content of chlorophyll (Chl), and net photosynthetic (PN) and transpiration rates. Pq treatment led to a decrease in Chl content and to a very strong inhibition of PN, the effects were manifested by 1 h of irradiation. Pq treatment did not affect the activity of ribulose-1,5 bisphosphate carboxylase (RuBPC, EC 4.1.1.39) but increased the activity of the photorespiratory enzymes phosphoglycolate phosphatase (PGP, EC 3.1.3.18), glycolate oxidase (GO, EC 1.1.3.1), and catalase (EC 1.11.1.6). Pre-treatment of seedlings with MeJA before exposure to Pq fully blocked the inhibitory effect of Pq on photosynthesis and protected against subsequent Pq-induced oxidative damage. |
| |
Keywords: | barley catalase chlorophyll glycolate oxidase Hordeum vulgare methyl jasmonate paraquat phosphoglycolate phosphatase photorespiration ribulose-1,5 bisphosphate carboxylase transpiration rate |
本文献已被 SpringerLink 等数据库收录! |
|