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植物学报（英文版）
植物学报（英文版）

刘春明

月刊

1672-9072

jipb@ibcas.ac.cn

010-62836133，010-62836563

100093

北京香山南辛村20号中科院植物所内

植物学报（英文版）/Journal Journal of Integrative Plant BiologyCSCDCSTPCD北大核心SCI
查看更多>>本学报是植物学综合性学术期刊。国外发行与交换达40多个国家和地区。国际标准A4大16开铜版纸印刷。本学报力争全面反映我国植物科学的最新研究成果，关注国际热点、新的学科生长点、前沿研究课题，重视报道重要的应用基础研究。主要栏目有植物生理生化、植物遗传学和分子生物学、植物生殖生物学、结构植物学、植物化学与资源植物学、植物系统与进化、植物生态学、古植物学的原始研究论文、综述和快讯。
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    Phase separation of S-RNase promotes self-incompatibility in Petunia hybrida∞

    Huayang TianHongkui ZhangHuaqiu HuangYu'e Zhang...
    986-1006页
    查看更多>>摘要：Self-incompatibility(SI)is an intraspecific re-productive barrier widely present in angiosperms.The SI system with the broadest occurrence in angiosperms is based on an S-RNase linked to a cluster of multiple S-locus F-box(SLF)genes found in the Solanaceae,Plantaginaceae,Rosaceae,and Rutaceae.Recent studies reveal that non-self S-RNase is degraded by the Skip Cullin F-box(SCF)SLF-mediated ubiquitin-proteasome system in a collaborative manner in Petunia,but how self-RNase functions largely remains mysterious.Here,we show that S-RNases form S-RNase con-densates(SRCs)in the self-pollen tube cytoplasm through phase separation and the disruption of SRC formation breaks SI in self-incompatible Petunia hybrida.We further find that the pistil SI factors of a small asparagine-rich protein HT-B and thioredoxin h together with a reduced state of the pollen tube all promote the expansion of SRCs,which then sequester several actin-binding pro-teins,including the actin polymerization factor PhABRACL,the actin polymerization activity of which is reduced by S-RNase in vitro.Meanwhile,we find that S-RNase variants lacking con-densation ability fail to recruit PhABRACL and are unable to induce actin foci formation required for pollen tube growth inhibition.Taken together,our results demonstrate that phase separation of S-RNase promotes SI response in P.hybrida,revealing a new mode of S-RNase action.
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    A converged ubiquitin-proteasome pathway for the degradation of TOC and TOM tail-anchored receptors∞

    Meijing YangShuai ChenShey-Li LimLang Yang...
    1007-1023页
    查看更多>>摘要：In plants,thousands of nucleus-encoded proteins translated in the cytosol are sorted to chloroplasts and mitochondria by binding to specific receptors of the TOC(translocon on the outer chloroplast membrane)and the TOM(translocon on the outer mitochondrial membrane)complexes for import into those organelles.The degradation pathways for these receptors are unclear.Here,we discovered a converged ubiquitin-proteasome pathway for the degradation of Arabidopsis thaliana TOC and TOM tail-anchored receptors.The receptors are ubiquiti-nated by E3 ligase(s)and pulled from the outer membranes by the AAA+adenosine triphosphatase CDC48,after which a previously uncharacterized cytosolic protein,transmembrane domain(TMD)-binding protein for tail-anchored outer membrane proteins(TTOP),binds to the exposed TMDs at the C termini of the receptors and CDC48,and delivers these complexes to the 26S proteasome.
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    CsRAXs negatively regulate leaf size and fruiting ability through auxin glycosylation in cucumber

    Jiacai ChenLiu LiuGuangxin ChenShaoyun Wang...
    1024-1037页
    查看更多>>摘要：Leaves are the main photosynthesis organ that directly determines crop yield and biomass.Dis-secting the regulatory mechanism of leaf devel-opment is crucial for food security and ecosystem turn-over.Here,we identified the novel function of R2R3-MYB transcription factors CsRAXs in regu-lating cucumber leaf size and fruiting ability.Csrax5 single mutant exhibited enlarged leaf size and stem diameter,and Csrax1/2/5 triple mutant displayed further enlargement phenotype.Over-expression of CsRAX1 or CsRAX5 gave rise to smaller leaf and thinner stem.The fruiting ability of Csrax1/2/5 plants was significantly enhanced,while that of CsRAX5 overexpression lines was greatly weakened.Similarly,cell number and free auxin level were elevated in mutant plants while decreased in overexpression lines.Biochemical data indicated that CsRAX1/5 directly promoted the expression of auxin glucosyltransferase gene CsUGT74E2.Therefore,our data suggested that CsRAXs function as repressors for leaf size de-velopment by promoting auxin glycosylation to decrease free auxin level and cell division in cu-cumber.Our findings provide new gene targets for cucumber breeding with increased leaf size and crop yield.
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    • 维普