The MADS-box gene SlMBP11 regulates plant architecture and affects reproductive development in tomato plants.
MADS-domain proteins are important transcription factors that are involved in many biological processes of plants. In the present study, SlMBP11, a member of the AGL15 subfamily, was cloned in tomato plants (Solanum lycopersicon M.). SlMBP11 is ubiquitously expressed in all of the tissues we examined, whereas the SlMBP11 transcription levels were significantly higher in reproductive tissues than in vegetative tissues. Plants exhibiting increased SlMBP11 levels displayed reduced plant height, leaf size, and internode length as well as a loss of dominance in young seedlings, highly branched growth from each leaf axil, and increased number of nodes and leaves. Moreover, overexpression lines also exhibited reproductive phenotypes, such as those having a shorter style and split ovary, leading to polycarpous fruits, while the wild type showed normal floral organization. In addition, delayed perianth senescence was observed in transgenic tomatoes. These phenotypes were further confirmed by analyzing the morphological, anatomical and molecular features of lines exhibiting overexpression. These results suggest that SlMBP11 plays an important role in regulating plant architecture and reproductive development in tomato plants. These findings add a new class of transcription factors to the group of genes controlling axillary bud growth and illuminate a previously uncharacterized function of MADS-box genes in tomato plants.
Laboratory of Molecular Biology of Tomato, Bioengineering College, Chongqing University, Chongqing 400044, People's Republic of China.
Xuhu
X
Guo
Laboratory of Molecular Biology of Tomato, Bioengineering College, Chongqing University, Chongqing 400044, People's Republic of China.
Guoping
G
Chen
Laboratory of Molecular Biology of Tomato, Bioengineering College, Chongqing University, Chongqing 400044, People's Republic of China.
Muhammad
M
Naeem
Laboratory of Molecular Biology of Tomato, Bioengineering College, Chongqing University, Chongqing 400044, People's Republic of China.
Xiaohu
X
Yu
Laboratory of Molecular Biology of Tomato, Bioengineering College, Chongqing University, Chongqing 400044, People's Republic of China.
Boyan
B
Tang
Laboratory of Molecular Biology of Tomato, Bioengineering College, Chongqing University, Chongqing 400044, People's Republic of China.
Anzhou
A
Li
Laboratory of Molecular Biology of Tomato, Bioengineering College, Chongqing University, Chongqing 400044, People's Republic of China. Electronic address: huzongli@cqu.edu.cn.
Zongli
Z
Hu
D018506:Gene Expression Regulation, Plant / Q000235:genetics / Q000502:physiology; D018551:Solanum lycopersicum / Q000235:genetics / Q000254:growth & development* / Q000502:physiology; D026161:MADS Domain Proteins / Q000235:genetics / Q000502:physiology*; D008855:Microscopy, Electron, Scanning; D020411:Oligonucleotide Array Sequence Analysis; D010940:Plant Proteins / Q000378:metabolism / Q000502:physiology; D018547:Plant Stems / Q000033:anatomy & histology / Q000378:metabolism; D030821:Plants, Genetically Modified / Q000378:metabolism; D060888:Real-Time Polymerase Chain Reaction
D026161:MADS Domain Proteins; D010940:Plant Proteins
MADS-box gene; Overexpression; Plant architecture; Reproductive structure; SlMBP11; Tomato