Transgenic tomato plants with decreased sucrose synthase are unaltered in starch and sugar accumulation in the fruit

Citation
S. Chengappa et al., Transgenic tomato plants with decreased sucrose synthase are unaltered in starch and sugar accumulation in the fruit, PLANT MOL B, 40(2), 1999, pp. 213-221
Citations number
36
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Plant Sciences","Animal & Plant Sciences
Journal title
PLANT MOLECULAR BIOLOGY
ISSN journal
0167-4412 → ACNP
Volume
40
Issue
2
Year of publication
1999
Pages
213 - 221
Database
ISI
SICI code
0167-4412(199905)40:2<213:TTPWDS>2.0.ZU;2-N
Abstract
Sucrose is the photoassimilate transported from the leaves to the fruit of tomato yet the fruit accumulates predominantly glucose and fructose. Hydrol ysis of sucrose entering the fruit can be accomplished by invertase or sucr ose synthase. Early in tomato fruit development there is a transient increa se in sucrose synthase activity and starch which is correlated with fruit g rowth and sink strength suggesting a regulatory role for sucrose synthase i n sugar import. Using an antisense sucrose synthase cDNA under the control of a fruit-specific promoter we show that sucrose synthase activity can be reduced by up to 99% in young fruit without affecting starch or sugar accum ulation. This result calls into question the importance of sucrose synthase in regulating sink strength in tomato fruit.