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Endoreduplication and Its Effect on Fruit Size in Tomato as Affected by Drought Stress

出版	University of Georgia, 2016
URL	http://books.google.com.hk/books?id=xmE7xQEACAAJ&hl=&source=gbs_api

註釋Endoreduplication in tomato fruit can result in high chromosomal DNA counts. Endoreduplication has been associated with cell expansion and may influence organ growth. These studies were conducted to understand if fruit size in tomato is affected by endoreduplication, to explore when during fruit development endoreduplication occurs, and to understand the effect that drought has on endoreduplication. Fully ripened fruit of 0́Micro-Tina' tomato plants were harvested for measurements. The first study revealed that endoreduplication was affected by beginning drought stress conditions when fruit were at breaker stage. Fruit soluble solids were increased under drought compared to well-watered conditions and fruit volume was decreased by drought stress compared to well-watered conditions. There was no correlation between endoreduplication and fruit volume. The second study was designed to quantify endoreduplication rates during fruit development. Endoreduplication was not affected by drought stress, but occurred during two distinct phases; when fruit were 9-16 d old (fruit enlargement) and when fruit were 33-48 d old (fruit ripening phase). Fruit size and endoreduplication were positively correlated when fruit were young (9-16 d old). Although fruit size and endoreduplication were negatively correlated when fruit were 23-43 d old, the correlation was weak. Fruit size was reduced by drought stress beginning when fruit were young. Fruit soluble solids, titratable acidity, color, and texture were not affected by drought stress, compared to well-watered conditions. This research revealed that endoreduplication does not just occur when fruit are young, as the previous literature has reported. Instead, endoreduplication may have different roles during different stages of fruit development.