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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Arabidopsis mutants deficient in diacylglycerol acyltransferase display increased sensitivity to abscisic acid, sugars, and osmotic stress during germination and seedling development.

Arabidopsis seeds store triacylglycerol (TAG) as the major carbon reserve, which is used to support postgerminative seedling growth. Diacylglycerol acyltransferase (DGAT) catalyzes the final step in TAG synthesis, and two isoforms of DGAT have previously been identified in Arabidopsis. It has been shown that DGAT1 plays an important role in seed development because Arabidopsis with mutations at the TAG1 locus accumulate less seed oil. There is also evidence showing that DGAT1 is active after seed germination. The aim of this study is to investigate the effect of mutations of DGAT1 on postembryonic development in Arabidopsis. We carried out detailed analyses of two tag1 mutants in different ecotypic backgrounds of Arabidopsis. Results show that during germination and seedling growth, seed storage TAG degradation was not affected in the tag1 mutants. However, sugar content of the mutant seedlings is altered, and activities of the hexokinases are significantly increased in the tag1 mutant seedlings. The tag1 mutants are also more sensitive to abscisic acid, glucose, and osmotic strength of the medium in germination and seedling growth.[1]


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