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| 1 | LATERAL ROOTLESS2, a Cyclophilin Protein, Regulates Lateral Root Initiation and Auxin Signaling Pathway in Rice显示文摘Dear Editor, Cyclophilins (CYP) are a class of highly conserved peptidyl-prolyl cis-trans isomerases (PPlases) that play important roles in various biological processes in eukaryotes (reviewed in Romano et al.(2004)).In higher plants,a conserved single domain cyclophilin has been identified as a novel component of the auxin signaling pathway by analyzing the tomato diageotropica (dgt) mutant (Ivanchenko et al.,2006;Oh et al.,2006).The dgt mutant displays a lateral-rootless and auxin-resistant phenotype (Ivanchenko et al.,2006).Further studies revealed that mutations in the DGT-like genes of Physcomitrella patens also exhibited an auxin-resistant phenotype,suggesting a conserved role of DGT-like proteins in auxin signaling.Moreover,mutation in PpDGT gene suppresses the auxin hypersensitive phenotype conferred by the overexpression of the auxin receptor gene PpAFB2,indicating that PpDGT acts downstream of PpAFB2 (Lavy et al.,2012). | Huakun Zheng Suiuan Li Bo Ren Jian Zhang Masahiko Ichii Shin Taketa Yuezhi Tao Jianru Zuo Hua Wang | 2013 | Molecular Plant2013，6，5： | 4 |
| 2 | Extensive and Heritable Epigenetic Remodeling and Genetic Stability Accompany Allohexaploidization of Wheat显示文摘 | Zhao Na Zhu Bo Li Mingjiu Wang Li Xu Liying Zhang Huakun Zheng Shuangshuang Qi Bao Han Fangpu Liu Bao | 2011 | Genetics2011，，3： | 1 |
| 3 | Involvement of a Putative Bipartite Transit Peptide in Targeting Rice Pheophorbide a Oxygenase into Chloroplasts for Chlorophyll Degradation during Leaf Senescence显示文摘Leaf senescence is one of the major factors contributing to the productivity and the grain quality in crops. The regulatory mechanism of leaf senescence remains largely unknown. Here, we report the identification and characterization of a rice early senescence 1(eas1)mutant, which displayed an early leaf senescence phenotype, accompanying by dwarfism and reduced tiller number, eventually leading to the reduction of grain yield. Map-based cloning revealed that the nuclear gene EAS1 encodes a pheophorbide a oxygenase(PaO), a key enzyme for chlorophyll breakdown. A highly conserved Thr residue of PaO was mutated into Ile in the eas1 mutant. Phylogenetic analysis indicates that PaO is an evolutionarily conserved protein, and EAS1 is 68% identical to the Arabidopsis ACCERLERATED CELL DEATH(ACD1) protein. Unlike ACD1 that contains a single transit peptide, EAS1 contains two putative transit peptides at its N-terminus, which are essential for its functionality, suggesting that targeting of EAS1 to the chloroplast is likely mediated by a putative bipartite transit peptide. Consistently, only a short version of EAS1 lacking the first putative transit peptide, but not the full-length EAS1,was capable of rescuing the Arabidopsis acd1 mutant phenotype. These results suggest that rice EAS1 represents a functional PaO, which is involved in chlorophyll degradation and may utilize a unique mechanism for its import into the chloroplast. | Qingjun Xie Yan Liang Jian Zhang Huakun Zheng Guojun Dong Qian Qian Jianru Zuo | 2016 | Journal of Genetics and Genomics2016，43，3： | 1 |
| 4 | A near-complete genome assembly of the allotetrapolyploid Cenchrus fungigraminus(JUJUNCAO)provides insights into its evolution and C4 photosynthesis显示文摘JUJUNCAO(Cenchrus fungigraminus;2n=4x=28)is a Cenchrus grass with the highest biomass production among cultivated plants,and it can be used for mushroom cultivation,animal feed,and biofuel production.Here,we report a nearly complete genome assembly of JUJUNCAO and reveal that JUJUNCAO is an allopolyploid that originated2.7 million years ago(mya).Its genome consists of two subgenomes,and subgenome A shares high collinear synteny with pearl millet.We also investigated the genome evolution of JUJUNCAO and suggest that the ancestral karyotype of Cenchrus split into the A and B ancestral karyotypes of JUJUNCAO.Comparative transcriptome and DNA methylome analyses revealed functional divergence of homeologous gene pairs between the two subgenomes,which was a further indication of asymmetric DNA methylation.The three types of centromeric repeat in the JUJUNCAO genome(CEN137,CEN148,and CEN156)may have evolved independently within each subgenome,with some introgressions of CEN156 from the B to the A subgenome.We investigated the photosynthetic characteristics of JUJUNCAO,revealing its typical C4 Kranz anatomy and high photosynthetic efficiency.NADP-ME and PEPCK appear to cooperate in the major C4 decarboxylation reaction of JUJUNCAO,which is different from other C4 photosynthetic subtypes and may contribute to its high photosynthetic efficiency and biomass yield.Taken together,our results provide insights into the highly efficient photosynthetic mechanism of JUJUNCAO and provide a valuable reference genome for future genetic and evolutionary studies,as well as genetic improvement of Cenchrus grasses. | Huakun Zheng Baiyu Wang Xiuting Hua Ruiting Gao Yuhao Wang Zixin Zhang Yixing Zhang Jing Mei Yongji Huang Yumin Huang Hui Lin Xingtan Zhang Dongmei Lin Siren Lan Zhongjian Liu Guodong Lu Zonghua Wang Ray Ming Jisen Zhang Zhanxi Lin | 2023 | Plant Communications2023，4，5： | 1 |
| 5 | Fine-mapping of SRT7 for short roots and identification of its candidate in rice显示文摘Three allelic short root mutants were identified by screening mutants with defective root elongation of the rice japonica cultivar Nipponbare mutant library generated via 60 Co γ-ray irradiation mutagenesis. These mutants, designated srt7-1 (short root 7-1), srt7-2 and srt7-3, respectively, had an extremely short seminal root, adventitious roots and lateral roots. Histological observation revealed the cell length of srt7 mutant roots was significantly shorter than that of wild-type roots. Genetic analysis indicated the short root phenotype was controlled by a single recessive nuclear gene. The SRT7 gene was mapped to a 20-kb interval between the markers STS6 and STS7 on chromosome 4 by a map-based cloning method. Sequencing of the six predicted genes in this region found that all of the three allelic mutants contained a 1-bp or 2-bp deletion in the same gene encoding a putative mem- brane-bound endo-1,4-β-glucanase. The SRT7 gene was expressed ubiquitously, with higher levels of transcript accumulation in roots at different developmental stages. However, no difference was found in the SRT7 transcription level between the mutant and wild type. Collectively, these results indicate the endo-1,4-β-glucanase encoding gene (LOC_Os04g41970) is likely the candidate for SRT7 that functions posttranscriptionally in rice root elongation. | LIU HongJia ZHENG HuaKun WANG Hua GUO Peng ZUO JianRu TAO YueZhi | 2011 | Chinese Science Bulletin2011，56，31： | 1 |
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