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. 1990 Nov;94(3):1456–1461. doi: 10.1104/pp.94.3.1456

Sucrose Synthase in Rice Plants 1

Growth-Associated Changes in Tissue Specific Distributions

Hing-Yuen Chan 1,2, Thai-Yen Ling 1,2, Rong-Huay Juang 1,2, I-Ni Ting 1,2, Hsien-Yi Sung 1,2, Jong-Ching Su 1,2
PMCID: PMC1077398  PMID: 16667853

Abstract

Different parts of the rice (Oryza sativa L.) plant at different growth stages were analyzed for sucrose synthase (SS) by enzyme activity assay and enzyme-linked immunosorbent assay directly on the extracts or on the eluates from a gel filtration column. On a dry matter basis, the amount of soluble protein and SS activity decreased significantly, but the amount of enzyme protein changed little in growing leaves. In the grain, the SS activity was the highest at the early ripening stage and decreased later, but the amount of SS protein increased with the increase in maturity. In the root, a low activity of SS was detectable only in the tillering but not in other stages. Immunoblotting of SS protein extracted from different parts of rice showed two bands. Elution patterns of crude extracts from a gel filtration column showed the presence of several types of SS protein. Among them, two to three types with larger elution volumes had the SS activity but others with smaller elution volumes (considered as the aggregated forms) had no activity. The SS purified from different parts of the plant showed similar but distinctly different electrophoretic mobilities in a native gel. It has been concluded that different isozymes are expressed in different tissues at different growth stages.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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