Effects of overexpression of the Rubisco small subunit gene under the control of the Rubisco activase promoter on Rubisco contents of rice leaves at different positions

被引:5
作者
Kudo, Natsumi [1 ]
Mano, Kazuhisa [1 ]
Suganami, Mao [1 ]
Kondo, Eri [1 ]
Suzuki, Yuji [1 ,2 ]
Makino, Amane [1 ]
机构
[1] Tohoku Univ, Grad Sch Agr Sci, Sendai, Miyagi, Japan
[2] Iwate Univ, Fac Agr, Morioka, Iwate 0208550, Japan
基金
日本学术振兴会; 日本科学技术振兴机构;
关键词
Leaf senescence; overexpression; Rubisco; Rubisco activase promoter; rice; RIBULOSE-1,5-BISPHOSPHATE CARBOXYLASE-OXYGENASE; RIBULOSE-BISPHOSPHATE CARBOXYLASE; RBCS MULTIGENE FAMILY; MESSENGER-RNA STABILITY; NITROGEN-USE EFFICIENCY; TRANSGENIC RICE; ENZYMIC PROPERTIES; DOWN-REGULATION; ANTISENSE RBCS; PHOTOSYNTHESIS;
D O I
10.1080/00380768.2020.1780898
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Photosynthetic activity is expected to be maintained during leaf senescence if the amount of Rubisco is maintained. As the mRNA level of the Rubisco gene decreases rapidly just before the stage of full expansion, its overexpression after full expansion would be effective. We previously found that the mRNA level of the Rubisco activase gene (RCA) is maintained during leaf senescence. In the present study, the Rubisco small subunit gene (RBCS) was overexpressed under the control of the promoter ofRCAin rice. Although Rubisco content increased in the uppermost, fully expanded leaves of transgenic plants in comparison with that in wild-type plants, in the penultimate leaves it decreased to a level similar to that of the wild-type plants. In expanding leaves in transgenic plants, the mRNA levels of the transgeneRBCSincreased further, leading to increases in the mRNA levels of totalRBCSand the Rubisco large subunit gene (RBCL). In the uppermost, fully expanded leaves and the penultimate fully expanded leaves, however, the mRNA levels ofRBCS2and totalRBCSdecreased drastically, and those ofRBCLwere similar to the wild-type levels. These results indicate that Rubisco content was not maintained during leaf senescence in the transgenic plants. One reason for this is that the expression ofRBCSby theRCApromoter was weak in leaves at low positions. We discuss the possible reasons for this unexpected phenomenon.
引用
收藏
页码:569 / 578
页数:10
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