C4 Photosynthesis Gene Discovered in Foxtail Millet |
Deoxycytidine monophosphate deaminase (DCD) is a key enzyme in the de novo deoxythymidine triphosphate (dTTP) synthesis. DCD is known to play key roles in cell cycle progression, and plant development. However, not much is known of the function of the DCD gene in Panicoideae plants. Setaria is an ideal model of Panicoideae grasses, especially for C4 photosynthesis research. |
Deoxycytidine monophosphate deaminase (DCD) is a key enzyme in the de novo deoxythymidine triphosphate (dTTP) synthesis. DCD is known to play key roles in cell cycle progression, and plant development. However, not much is known of the function of the DCD gene in Panicoideae plants. Setaria is an ideal model of Panicoideae grasses, especially for C4 photosynthesis research.
Researchers from the Chinese Academy of Agricultural Sciences studied a foxtail millet (Setaria italica) stripe leaf mutant, sistl2. The sistl2 mutant exhibited semi-dwarfism, striped leaves, abnormal chloroplast structure, and delayed cell cycle progression compared with its wildtype parent Yugu1.
The researchers, which were led by Shuo Zhang and Sha Tang, identified the causal gene SiSTL2, which encodes a DCD protein. Further analysis indicated that SiSTL2 plays a role in the regulation of chloroplast biogenesis, cell cycle, and DNA replication, which suggested that the gene has similar functions in both foxtail millet and rice.
This study provides in-depth knowledge of the role of DCD in the C4 photosynthesis of model plant Setaria.
For more information, read the article in Frontiers in Plant Science.
Figure 1: Phenotypic characterization of sistl2 mutant. (A) The four-leaf stage seedlings of Yugu1 and sistl2. (B) The first four leaves of Yugu1 and sistl2 were placed in order from left to right. In each couple, the left one is Yugu1, and the right one is sistl2. (C) The first leaf of Yugu1 and the mutant. (D) The third leaf of Yugu1 and the mutant. (E) The seeds of Yugu1 and sistl2. (F) Heading stage phenotypes of Yugu1 and sistl2. (G) The mature leaves of Yugu1 and sistl2 of heading stage. (H) The leaf length and leaf width were clearly reduced in addition to the panicle size, panicle weight, and the seed setting percentage of Yugu1 and sistl2. The leaves used for size measurement are mature top second leaves of Yugu1 and sistl2 at heading stage, respectively. The means and standard deviations were obtained from five independent leaf samples. Statistical analysis was performed with the t-test. |
Trở lại In Số lần xem: 429 |
[ Tin tức liên quan ]___________________________________________________
|