期刊
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 64, 期 5, 页码 1176-1184出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.5b05238
关键词
Solanum tuberosum L.; tuber growth; potato sprouting; tuber ends; dry matter; starch granules; real-time quantitative polymerase chain reaction; starch metabolism; gene expression
资金
- Agriculture and Agri-Food Canada (AAFC) A-base
- National Natural Science Foundation of China [31160298]
- Science Foundation for Distinguished Young Scholars of Gansu Province of China [1308RJDA011]
- China Scholarship Council
Potatoes usually have the tuber bud end dominance in growth during tuber bulking and in tuber sprouting, likely using carbohydrates from the tuber stem end. We hypothesized that the tuber bud end and tuber stem end coordination in carbohydrate metabolism gene expression is different between the bulking dominance and sprouting dominance of the tuber bud end. After comparing the growing tubers at harvest from a green vine and the stage that sprouts just started to emerge after storage of tubers at room temperature, we found the following: (1) Dry matter content was higher in the tuber stem end than the tuber bud end at both stages. (2) The starch granule size was larger in the tuber bud end than in the tuber stem end. (3) The tuber bud end had higher gene expression for starch synthesis but a lower gene expression of sucrose transporters than the tuber stem end during tuber growing. (4) The tuber stem end at the sprouting stage showed more active gene expression in both starch degradation and resynthesis, suggesting more active export of carbohydrates, than the tuber bud end. The results indicate that the starch accumulation mechanism in the tuber bud end was different between field growing and post-harvest sprouting, tubers and that tubers already increased dry matter and average starch granule sizes in the tuber bud end prior to the rapid growth of sprouts.
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