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Diversity and selection of the continuous-flowering gene, RoKSN, in rose 被引量:1
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作者 Vanessa Soufflet-Freslon Emilie Araou +10 位作者 Julien Jeauffre Tatiana Thouroude Annie Chastellier Gilles Michel Yuki Mikanagi Koji Kawamura Mark Banfield Cristiana Oghina-Pavie Jeremy Clotault Alix Pernet Fabrice Foucher 《Horticulture Research》 SCIE 2021年第1期1155-1165,共11页
Blooming seasonality is an important trait in ornamental plants and was selected by humans.Wild roses flower only in spring whereas most cultivated modern roses can flower continuously.This trait is explained by a mut... Blooming seasonality is an important trait in ornamental plants and was selected by humans.Wild roses flower only in spring whereas most cultivated modern roses can flower continuously.This trait is explained by a mutation of a floral repressor gene,RoKSN,a TFL1 homologue.In this work,we studied the origin,the diversity and the selection of the RoKSN gene.We analyzed 270 accessions,including wild and old cultivated Asian and European roses as well as modern roses.By sequencing the RoKSN gene,we proposed that the allele responsible for continuous-flowering,RoKSN copia,originated from Chinese wild roses(Indicae section),with a recent insertion of the copia element.Old cultivated Asian roses with the RoKSN copia allele were introduced in Europe,and the RoKSN copia allele was progressively selected during the 19th and 20th centuries,leading to continuous-flowering modern roses.Furthermore,we detected a new allele,RoKSN A181,leading to a weak reblooming.This allele encodes a functional floral repressor and is responsible for a moderate accumulation of RoKSN transcripts.A transient selection of this RoKSN A181 allele was observed during the 19th century.Our work highlights the selection of different alleles at the RoKSN locus for recurrent blooming in rose. 展开更多
关键词 originated SELECTION INSERTION
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Production of Multi-Features Driven Nationwide Vegetation Physiognomic Map and Comparison to MODIS Land Cover Type Product
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作者 Ram C. Sharma Keitarou Hara +10 位作者 Hidetake Hirayama Ippei Harada Daisuke Hasegawa Mizuki Tomita Jong Geol Park Ichio Asanuma Kevin M. Short Masatoshi Hara Yoshihiko Hirabuki Michiro Fujihara Ryutaro Tateishi 《Advances in Remote Sensing》 2017年第1期54-65,共12页
Irrespective of several attempts to land use/cover mapping at local, regional, or global scales, mapping of vegetation physiognomic types is limited and challenging. The main objective of the research is to produce an... Irrespective of several attempts to land use/cover mapping at local, regional, or global scales, mapping of vegetation physiognomic types is limited and challenging. The main objective of the research is to produce an accurate nationwide vegetation physiognomic map by using automated machine learning approach with the support of reference data. A time-series of the multi-spectral and multi-indices data derived from Moderate Resolution Imaging Spectroradiometer (MODIS) were exploited along with the land-surface slope data. Reliable reference data of the vegetation physiognomic types were prepared by refining the existing vegetation survey data available in the country. The Random Forests based mapping framework adopted in the research showed high performance (Overall accuracy = 0.82, Kappa coefficient = 0.79) using 148 optimum number of features out of 231 featured used. A nationwide vegetation physiognomic map of year 2013 was produced in the research. The resulted map was compared to the existing MODIS Land Cover Type (MCD12Q1) product of year 2013. A huge difference was found between two maps. Validation with the reference data showed that the MCD12Q1 product did not work satisfactorily in Japan. The outcome of the research highlights the possibility of improving the accuracy of the MCD12Q1 product with special focus on reference data. 展开更多
关键词 VEGETATION PHYSIOGNOMY MULTI-SPECTRAL TOPOGRAPHY MODIS Mapping Machine Learning Japan MCD12Q1
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New acetogenin katsuurallene from Laurencia saitoi collected from Katsuura, Japan
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作者 Yu Minamida Hiroshi Matsuura +10 位作者 Takahiro Ishii Miyu Miyagi Yuto Shinjo Kosuke Sato Takashi Kamada Yoshihiro Mihara Iwao Togashi Keisuke Sugimoto Tsuyoshi Abe Norio Kikuchi Minoru Suzuki 《Natural Products and Bioprospecting》 2022年第1期121-127,共7页
We examined the chemical constitution of the red alga Laurencia saitoi Perestenko,collected from Katsuura,Boso Peninsula,Chiba Prefecture,Japan.This specimen produced a new polyhalogenated acetogenin,named katsuural-l... We examined the chemical constitution of the red alga Laurencia saitoi Perestenko,collected from Katsuura,Boso Peninsula,Chiba Prefecture,Japan.This specimen produced a new polyhalogenated acetogenin,named katsuural-lene(1),which structure was determined by the spectral methods,along with known diterpene,deoxyparguerol(2)and triterpene,thyrsiferol(3).In this paper we describe the structural elucidation of katsuurallene together with some biological activities. 展开更多
关键词 LAURENCIA RHODOMELACEAE ACETOGENIN TRITERPENE DITERPENE Biological activity
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New discovery of fossil cycad-like plants from the Middle Jurassic of West Liaoning,China 被引量:9
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作者 WANG Yongdong ZHANG Wu +2 位作者 ZHENG Shaolin SAIKI Keni'chi LI Nan 《Chinese Science Bulletin》 SCIE EI CAS 2005年第16期1804-1807,共4页
关键词 中国 辽宁 植物化石 种子植物 侏罗纪时代
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