Partitioning of 13C-labeled Photosynthate in Eddoe Plants with Special Reference to Source-sink Unit

Japanese Journal of Crop Science

Hideki SUGIMOT0¹ 

关键词: Carbon partitioning;    親イモ;    ^<13>C-labeled photosynthate;    サトイモ;    Colocasia esculenta(L.) Schott;    ^<13>C-光合成産物;    Daughter tuber;    ソース・シンク単位;    Eddoe;    転流;    Mother tuber;    分球イモ;    Source-sink unit;   

DOI  :  10.1626/jcs.70.99

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

The partitioning of 13C-labelled photosynthate in eddoe plants(Colocasia esculenta(L.) Schott) was studied. At various stages of development, the whole plants of cv. Uhan were fed with 13CO2.The 13C-labeled photosynthate at an early development stage was distributed mainly to the leaves and petioles, that at the middle developmental stage to the leaves, petioles and tubers, and that at the late developmental stage to the tubers. When secondary tubers began to enlarge, mother-or daughter-tuber leaves in three types of eddoe cultivars classified as daughter-tuber type(ev. Uhan), mother-and daughter-tuber type(ev.Akame), and mother-tuber type(ev. Taiwan-imo) were fed with 13CO2. A great part or 13C-labeled photosynthate from mother tube rleaves was distributed to daughter tubers in Uhan, both to daughter and mother tubers in Akame, and to mother tuber in Taiwan-imo. This tendency was the same even in the plants from which daughter leaves had been removed. The 13C-labeled photosynthate from daughter-tuber leaves was distributed to daughter and secondary tubers but not to the mother tuber in Uhan and Akame. However it was also distributed to the mother tuber in Taiwan-imo. It was revealed that photosynthates from daughter-tuber leaves contributed greatly to the enlargement of the tubers, especially daughter and secondary tubers. The partitioning pattern 13C-labeled photosynthates from mother-and daughter-tuber leaves reflected the charaeteristics or tuber growth and showed existence of source-sink unit specific to each cultivar.

【 授权许可】

Unknown