Acylsugar Synthesis, Accumulation and Secretion in Lycopersicon Pennellii Corr. (D'arcy)
- ISBN-10
- 0591840634
- ISBN-13
- 9780591840636
- Pages
- 264
- Language
- English
- Published
- 1998
- Publisher
- Cornell University, May
- Author
- Dipanwita Maiti
Description
In L. pennellii secretory accessions (LA716, LA1376 and LA1941), acylsugars are secreted by both type I and type IV glandular trichomes. Determination of the localization of the acylglucose biosynthetic enzymes indicates that these glandular trichomes are the primary site for acylation of glucose within the biosynthetic pathway. The major amounts of UDP-Glc:fatty acid glucosyltransferase II (GTII) and disproportionation acyltransferase (AT) which catalyze the formation of the monoacylglucose and the higher-order acylglucoses, respectively, accumulate in the trichome tip cell; whereas, $\alpha$-isopropylmalate synthase (IPMS, which is responsible for odd chain length branched fatty acids) transcripts do not accumulate within the tip cell. A similar pattern of organization of these enzymes is observed in L. esculentum. This suggests that the lack of acylsugar synthesis in L. esculentum is not due to the overall pattern of distribution of the acylsugar biosynthetic enzymes within secretory and non-secretory Lycopersicon species, but is rather due to the difference in the enzyme activity level.
