Journal
BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY
Volume 76, Issue 11, Pages 2129-2134Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1271/bbb.120545
Keywords
full-length cDNA overexpressing gene hunting system (FOX hunting system); grain size; rice (Oryza sativa L.); transient starch accumulation; TIFY/JAZ protein
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Funding
- Programme for Promotion of Basic and Applied Researches for Innovations in Bio-oriented Industry
- Ministry of Agriculture, Forestry and Fisheries of Japan [EF-1004, IPG-0020, AMR-0001]
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Screening of rice full-length cDNA overexpressing (FOX) lines allowed the identification of a TIFY gene, TIFY11b, as a growth-promoting gene whose overexpression increased plant height and seed size. The grains of TIFY11b-overexpressing plants exceeded those of non-transformants in length, width and thickness, resulting in 9-21% increases in grain weight. The increase was achieved by overexpressing the gene in the whole plant body, but not by seed-restricted expression, indicating that seed enlargement is attributable to overexpression in vegetative organs such as the leaf. The whole-body overexpressing plants developed longer leaves along with higher levels of starch and sucrose in the leaf sheath and culm at the heading stage than the non-transformants. Although overexpression of TIFY11b did not alter the photosynthetic rate per leaf area before and after heading, it caused an accumulation of higher levels of the carbohydrate assimilate, probably due to increased photosynthesis per plant, suggesting that the increase in grain size and weight is attained by enhanced accumulation and translocation of the carbohydrate in the culms and leaf sheaths of the transgenic plants. Thus, TIFY11b is a novel grain-size increasing gene.
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