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Plant and Cell Physiology, 2002, Vol. 43, No. 8 869-876
© 2002 Oxford University Press

Isolation and Characterization of Triacontanol-Regulated Genes in Rice (Oryza sativa L.): Possible Role of Triacontanol as a Plant Growth Stimulator

Xinping Chen1,2, Hongyu Yuan1, Rongzhi Chen1, Lili Zhu1, Bo Du1, Qingmei Weng1 and Guangcun He1,2,3

1 Key Laboratory of Ministry of Education for Plant Developmental Biology, Wuhan University, Wuhan 430072, P. R. China
2 College of Life Sciences, Wuhan University, Wuhan 430072, P. R. China

Triacontanol (TRIA) is a saturated long-chain alcohol that is known to have a growth promoting activity when exogenously supplied to a number of plants. In this study, dry weight, protein and chlorophyll contents of rice seedlings were increased by foliar application of TRIA. Leaf net photosynthesis rate (Pn) was increased very quickly and persistently at a given photon flux density (PFD). The TRIA-regulated genes in rice were isolated from cDNA library by differential screening with probes generated from the forward- and reverse-suppression subtractive hybridization (SSH) populations and confirmed by Northern blot. Sequence analysis revealed that most of the up-regulated genes encoded the photosynthetic and photorespiratory proteins. Two down-regulated genes were identified as those encoding an ABA- and stress-related protein and a wounding-related protein. These results suggested that TRIA up-regulated the photosynthesis process and suppressed stresses in rice plants. Time-course profiles of expression of rbcS isogenes suggested the complex mechanisms involved in the regulation of photosynthesis promoted by TRIA.

3 Corresponding author: E-mail, gche@whu.edu.cn; Fax, +86-27-8721-4327.


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