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Characterization of Chloroplasts Isolated from Triazine-Susceptible and Triazine-Resistant Biotypes of Brassica campestris L

, : Characterization of Chloroplasts Isolated from Triazine-Susceptible and Triazine-Resistant Biotypes of Brassica campestris L. Plant Physiology 70(1): 24-29

Chloroplasts isolated from triazine-susceptible and triazine-resistant biotypes of B. campestris L. were analyzed for lipid composition, ultrastructure and relative quantum requirements of photosynthesis. In general, phospholipids, but not glycolipids, in chloroplasts from the triazine-resistant biotype had a higher linolenic acid concentration and lower levels of oleic and linoleic fatty acids, than chloroplasts from triazine-susceptible plants. Chloroplasts from the triazine-resistant biotype had a 1.6-fold higher concentration of t-.DELTA.3-hexadecenoic acid with a concomitantly lower palmitic acid concentration in phosphatidylglycerol. Phosphatidylglycerol previously has been hypothesized to be a boundary lipid for photosystem II. Chloroplasts from the triazine-resistant biotype had a lower chlorophyll [Chl] a/b ratio and exhibited increased grana stacking. Light-saturation curves revealed that the relative requirement for whole chain electron transport at limiting light intensities was lower for the susceptible biotype than for the triazine-resistant biotype. Although the level of the Chl a/b light-harvesting complex associated with photosystem II was greater in resistant biotypes, the increased levels of the light-harvesting complex did not increase the photosynthetic efficiency enough to overcome the rate limitation that is inherited concomitantly with the modification of the S-triazine binding site.

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Accession: 001053375

PMID: 16662454

DOI: 10.1104/pp.70.1.24

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