Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 57, Issue 18, Pages 8480-8487Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jf901593m
Keywords
Tomato starch; starch granule; starch degradation; C-14 Glucose labeling
Funding
- The Anandainahidol Foundation
- National Science Foundation [MCB-0620001]
- University of California Experimental Station [CA-D*-PLS-7821-H]
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Starch is transiently accumulated in tomato fruit with near complete degradation achieved by maturity. Surprisingly, C-14-pulse-chase analyses indicated that the rate of starch degradation was highest in immature fruit [10 days post anthesis (DPA)] when maximal synthesis occurs, but was almost undetectable at 45 D A when there is net brea down of starch, Further analysis of starch accumulation, rate of synthesis, particle size analysis, and confocal laser scanning microscopy of starch granules from developing fruit suggests that the rate of starch degradation does increase after 40 D A, but it may not occur at the same site at which starch is synthesized. Furthermore, the degradation rate at maturity is lower than that measured in early development. Overall, the results suggest that starch degradation in developing tomato is biphasic with separate regiotemporal occurrences. This mechanism may have evolved to offer flexibility in balancing starch accumulation and utili ation in the developing fruit.
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