Riken Corporation

National Institute of Agrobiological Sciences

National Agriculture and Bio-oriented Research Organization

Masatomo Kobayashi

Hiroshi Tanaka

Makoto Matsuoka

Toshiaki Kayano

Kazuo Shinozaki

Satoshi Iuchi

Masahiro Yano

Tomoaki Sakamoto

Miho Sakai

Tamio Saito

A DNA encoding a neoxanthin cleavage enzyme used for improving stress tolerance in a plant, a method for increasing stress tolerance in a plant by introducing the DNA into the plant, and a transgenic plant into which a neoxanthin cleavage enzyme gene is introduced, are provided. A DNA used for reducing stress tolerance in a plant, a method for decreasing stress tolerance in a plant by introducing the DNA into the plant, and a transgenic plant into which the DNA is introduced, are also provided. The present invention enables creating a plant in which stress tolerance has been increased or decreased.

Transgenic plants carrying neoxanthin cleavage enzyme gene

An objective of the present invention is to provide DNAs encoding novel plant proteins having a gibberellin (GA) 2-oxidation activity. Another objective is to modify plant height by utilizing these DNAs for regulating the gibberellin content. PCR was performed using degenerate primers, and novel OsGA2ox2 and OsGA2ox3 genes were obtained. The present inventors discovered that unlike products of other GA2-oxidases such as OsGA2ox1, the product of OsGA2ox3 catalyzes the two-step oxidation of GAto GAand then of GAto GA-catabolite. In addition, the present inventors also found that the growth of the transgenic rice plants expressing OsGA2ox3 was suppressed as compared to control plants.

Gibberellin 2-oxidase gene, functions and uses thereof

Novel GA2&#x3b2;-hydroxylase genes were successfully isolated from rice. In addition, plants whose plant type has been modified compared with their wild type counterparts, were successfully constructed via these genes.

Gibberellin 2&#x3b2;-hydroxylase genes of rice and uses thereof

Genomic DNA and cDNA encoding GA 3&#x3b2;-hydroxylase were isolated from rice. When the expression of these genes was suppressed in rice plants, the plants became dwarfed compared with the wild type plants.

Gibberellin 3&#x3b2;-hydroxylase genes of rice and uses thereof

Growing community of inventors

Tsukuba, Japan

Masatomo Kobayashi