Abstract
Summary Grains of wheat ( Triticum aestivum ) were soaked in 0–28 mgL -1 SAN-9789, a herbicide which inhibits carotenoid synthesis, and grown under weak red light (16mWm- 2 ). Untreated grains were also grown in a greenhouse. Western blot analysis showed that the polypeptides of the light-harvesting complex of photosystem II (LHCII) were present in thylakoids of plants treated with 0–0.28mgL -1 SAN-9789, while treatment with 2.8 or 28mgL -1 resulted in detection of only the 27kDa polypeptide of LHCII and in significantly reduced amounts compared to the other treatments. Phosphatidylglycerol acylated with trans-hexadecenoic acid (PG-16: 1- trans ) was present in all treatments. In control plants grown in a greenhouse, LHCII proteins constituted a larger part of the thylakoid polypeptides compared to the red light-grown plants, and PG-16: Itrans made up twice as large a proportion of the thylakoid lipids as in the other treatments. In the plants treated with 2.8 or 28mgL -1 SAN-9789, there was no correlation between presence of LHC II polypeptides and PG-16:1 trans . The results show that presence of PG-16:1 trans did not regulate accumulation of LHC II proteins or thylakoid appression when the carotenoid content was very low.
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