A rice semi-dwarf gene, Tan-Ginbozu (D35), encodes the gibberellin biosynthesis enzyme, ent-kaurene oxidase

被引:223
作者
Itoh, H
Tatsumi, T
Sakamoto, T
Otomo, K
Toyomasu, T
Kitano, H
Ashikari, M
Ichihara, S
Matsuoka, M [1 ]
机构
[1] Nagoya Univ, Biosci & Biotechnol Ctr, Nagoya, Aichi 4648601, Japan
[2] Univ Tokyo, Field Prod Sci Ctr, Tokyo 1880002, Japan
[3] Yamagata Univ, Fac Agr, Dept Bioresource Engn, Wakaba, Turuoka 9978555, Japan
[4] Meijo Univ, Agr High Tech Res Ctr, Nagoya, Aichi 4688502, Japan
关键词
D35; gene cluster; gibberellin; phytoalexin;
D O I
10.1023/B:PLAN.0000038261.21060.47
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
A rice (Oryza sativa L.) semi-dwarf cultivar, Tan-Ginbozu (d35(Tan-Ginbozu)), contributed to the increase in crop productivity in Japan in the 1950s. Previous studies suggested that the semi-dwarf stature of d35(Tan-Ginbozu) is caused by a defective early step of gibberellin biosynthesis, which is catalyzed by entkaurene oxidase (KO). To study the molecular characteristics of d35(Tan-Ginbozu), we isolated 5 KO-like (KOL) genes from the rice genome, which encoded proteins highly homologous to Arabidopsis and pumpkin KOs. The genes (OsKOL1 to 5) were arranged as tandem repeats in the same direction within a 120 kb sequence. Expression analysis revealed that OsKOL2 and OsKOL4 were actively transcribed in various organs, while OsKOL1 and OsKOL5 were expressed only at low levels; OsKOL3 may be a pseudogene. Sequence analysis and complementation experiments demonstrated that OsKOL2 corresponds to D35. Homozygote with null alleles of D35 showed a severe dwarf phenotype; therefore, d35(Tan-Ginbozu) is a weak allele of D35. Introduction of OsKOL4 into d35(Tan-Ginbozu) did not rescue its dwarf phenotype, indicating that OsKOL4 is not involved in GA biosynthesis. OsKOL4 and OsKOL5 are likely to take part in phytoalexin biosynthesis, because their expression was promoted by UV irradiation and/or elicitor treatment. Comparing d35(TanGinbozu) with other high yielding cultivars, we discuss strategies to produce culm architectures suitable for high crop yield by decreasing GA levels.
引用
收藏
页码:533 / 547
页数:15
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