Photosynthetica 2002, 40(1):157-160 | DOI: 10.1023/A:1020156021629

Effects of Phytoplasma Infection on Growth and Photosynthesis in Leaves of Field Grown apple (Malus Pumila Mill. cv. Golden Delicious)

M. Bertamini1, K. Muthuchelian2, M.S. Grando1, N. Nedunchezhian1
1 Istituto Agrario di San Michele all' Adige, San Michele all' Adige, Italy
2 School of Energy, Environment and Natural Resources, Madurai Kamaraj University, Madurai, India

The contents of chlorophyll (Chl), leaf biomass, and soluble proteins were markedly decreased in phytoplasma infected apple leaves. Similar results were also observed for ribulose-1,5-bisphosphate carboxylase, 14CO2 fixation, and nitrate reductase activity. In contrast, the contents of sugars, starch, amino acids, and total saccharides were significantly increased in phytoplasma infected leaves. In isolated chloroplasts, phytoplasma infection caused marked inhibition of whole photosynthetic electron chain and photosystem 2 (PS2) activity. The artificial exogenous electron donor, diphenyl carbazide, significantly restored the loss of PS2 activity in infected leaves. Similar results were obtained when Fv/Fm was evaluated by in vivo Chl a fluorescence kinetic measurements.

Additional key words: amino acids; chlorophyll content and fluorescence; electron donor; nitrate reductase; photosystem; phytoplasma; proteins; ribulose-1,5-bisphosphate carboxylase; sugars; starch

Published: March 1, 2002  Show citation

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Bertamini, M., Muthuchelian, K., Grando, M.S., & Nedunchezhian, N. (2002). Effects of Phytoplasma Infection on Growth and Photosynthesis in Leaves of Field Grown apple (Malus Pumila Mill. cv. Golden Delicious). Photosynthetica, 40(1), 157-160. doi: 10.1023/A:1020156021629
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