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牛常见变位和扭转病症的治疗
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作者 侯俊峰 《吉林畜牧兽医》 2003年第9期20-21,共2页
关键词 胃肠 器官变位 器官扭转 病症 治疗 真胃 盲肠扩张
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NECK LEAF 1, a GATA type transcription factor, modulates organogenesis by regulating the expression of multiple regulatory genes during reproductive development in rice 被引量:6
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作者 Liping Wang Hengfu Yin +4 位作者 Qian Qian Jun Yang Chaofeng Huang Xiaohe Hu Da Luo 《Cell Research》 SCIE CAS CSCD 2009年第5期598-611,共14页
In the monocot rice species Oryza sativa L., one of the most striking morphological processes during reproductive development is the concurrence of panicle development with the sequential elongation of upper internod... In the monocot rice species Oryza sativa L., one of the most striking morphological processes during reproductive development is the concurrence of panicle development with the sequential elongation of upper internodes (UPIs). To elucidate the underlying molecular mechanisms, we cloned the rice gene NECK LEAF 1 (NL1), which when mutated results in delays in flowering time, smaller panicles with overgrown bracts and abnormal UPI elongation patterns. The NL1 gene encodes a GATA-type transcription factor with a single zinc finger domain, and its transcripts are de- tected predominantly in the bract primordia, which normally degenerate in the wild-type plants. Overexpression of NL1 in transgenic plants often gives rise to severe growth retardation, less vegetative phytomers and smaller leaves, suggesting that NL1 plays an important role in organ differentiation. A novel mutant allele of PLASTOCHRON1 (PLAD, a gene known to play a key role in regulating leaf initiation, was identified in this study. Genetic analysis demonstrated an interaction between nil and plal, with NL1 acting upstream of PLA1. The expression level and spatial pattern of PLA1 were found to be altered in the nil mutant. Furthermore, the expression of two regulators of flowering, Hd3a and OsMADS1, was also affected in the nil mutant. On the basis of these findings, we propose that NL1 is an intrinsic factor that modulates and coordinates organogenesis through regulating the expression of PLA1 and other regulatory genes during reproductive development in rice. 展开更多
关键词 elongation of upper internodes ORGANOGENESIS panicle development phase transition NECK LEAF 1 GATA- like transcription factor
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Chromosome-scale genomes provide new insights into subspecies divergence and evolutionary characteristics of the giant panda 被引量:1
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作者 Xuanmin Guang Tianming Lan +28 位作者 Qiu-Hong Wan Yan Huang Hong Li Mingchun Zhang Rengui Li Zhizhong Zhang Yinghu Lei Ling Zhang Heming Zhang Desheng Li Xiaoping Li Haimeng Li Yan Xu Maiju Qiao Daifu Wu Keyi Tang Pengpeng Zhao Jian-Qing Lin Sunil KumarSahu Qiqi Liang Wenkai Jiang Danhui Zhang Xun Xu Xin Liu Michael Lisby Huanming Yang Karsten Kristiansen Huan Liu Sheng-Guo Fang 《Science Bulletin》 SCIE EI CSCD 2021年第19期2002-2013,M0004,共13页
Extant giant pandas are divided into Sichuan and Qinling subspecies.The giant panda has many speciesspecific characteristics,including comparatively small organs for body size,small genitalia of male individuals,and l... Extant giant pandas are divided into Sichuan and Qinling subspecies.The giant panda has many speciesspecific characteristics,including comparatively small organs for body size,small genitalia of male individuals,and low reproduction.Here,we report the most contiguous,high-quality chromosomelevel genomes of two extant giant panda subspecies to date,with the first genome assembly of the Qinling subspecies.Compared with the previously assembled giant panda genomes based on short reads,our two assembled genomes increased contiguity over 200-fold at the contig level.Additional sequencing of 25 individuals dated the divergence of the Sichuan and Qinling subspecies into two distinct clusters from 10,000 to 12,000 years ago.Comparative genomic analyses identified the loss of regulatory elements in the dachshund family transcription factor 2(DACH2)gene and specific changes in the synaptotagmin 6(SYT6)gene,which may be responsible for the reduced fertility of the giant panda.Positive selection analysis between the two subspecies indicated that the reproduction-associated IQ motif containing D(IQCD)gene may at least partly explain the different reproduction rates of the two subspecies.Furthermore,several genes in the Hippo pathway exhibited signs of rapid evolution with giant panda-specific variants and divergent regulatory elements,which may contribute to the reduced inner organ sizes of the giant panda. 展开更多
关键词 Giant panda Chromosome-level genome Divergence time Reduced fertility Inner organ size
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