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Alteration in growth and thylakoid membrane lipid composition of Azolla caroliniana under phosphate deficiency

Author:
Ismail, G. S. M., Mohamed, H. E.
Source:
Biologia plantarum 2010 v.54 no.4 pp. 671-676
ISSN:
0006-3134
Subject:
Azolla caroliniana, anthocyanins, biomass production, chlorophyll, fatty acid composition, ferns and fern allies, growth retardation, phosphates, phospholipids, phosphorus, photosystem II, thylakoids, ultrastructure
Abstract:
The changes in the fresh biomass accumulation, photosynthetic and anthocyanin pigments, photosystem 2 (PS 2) activity, ultrastructure of chloroplast, total lipids and fatty acid composition of thylakoid membrane were followed in the aquatic fern Azolla caroliniana grown on medium either deficient or supplied with various phosphorus concentrations. The content of photosynthetic pigments and the anthocyanin/chlorophyll ratio increased significantly with increasing PO₄ ³⁻ concentration. Phosphate deficiency inhibited growth and PS 2 activity and decreased content of total lipids and phospholipids in isolated thylakoids. This was accompanied with a significant increase in the percentage of galalactolipids.
Agid:
2277383