简介：TheexpressionpatternsofOsPIL11,oneofsixputativephytochrome-interactingfactors,wereanalyzedindifferentorgansoftransgenictobacco(Nicotianatabacum).TheexpressionofOsPIL11wasorgan-specificandwasregulatedbyleafdevelopment,abscisicacid(ABA),jasmonicacid(JA)andsalicylicacid(SA).TofurtherexploretheroleofOsPIL11inplantlightsignaltransduction,aplantexpressionvectorofOsPIL11wasconstructedandintroducedintotobacco.Whengrownundercontinuousredlight,OsPIL11-overexpressedtransgenictobaccoexhibitedshorterhypocotylsandlargercotyledonsandleavescomparedtowild-typeseedlings.Whengrownundercontinuousfar-redlight,however,transgenicandwild-typeseedlingsshowedsimilarphenotypes.TheseresultsindicatethatOsPIL11isinvolvedinredlightinducedde-etiolation,butnotinfar-redlightinducedde-etiolationintransgenictobacco,whichlaysthefoundationfordissectingthefunctionofOsPIL11inphytochrome-mediatedlightsignaltransductioninrice.

简介：向光性是植物为捕捉更多光能而建立起来的对不良光照条件的适应机制之一．蓝光被证明是引起植物向光性最有效的光源．最近的研究进一步揭示植物体内一定存在一种对蓝光具特殊敏感性从而引起向光性反应的光受体．光生物学家已克隆得到数种ｃＤＮＡ并证明它们当中至少有一种对向光性受体负责，遗憾的是至今并没有弄清楚到底是哪一种ｃＤＮＡ表达向光性受体．就诱导向光性反应而言，红光是无效的，但早在本世纪５０年代就已有人证明红光对植物向光性行为产生深刻影响．最新的研究（Ｌｉｕ＆Ｉｉｎｏ１９９６）已证明红光对蓝光所诱导向光性的影响是由光敏色素这一红光／远红光受体参与调节的．研究发现对蓝光和远红光敏感的向光性受由对红光敏感的光敏色素的严格控制．绝对黑暗条件下生长的植物向光性蓝光刺激无反应，不表现向光性．这样的植物只有接受了红光或远红光前处理后才对向光性蓝光刺激有反应．这一重大发现揭示了向光性反应中光敏色素与向光性受体的相互作用，并为光生物学家彻底搞清楚植物向光性受体提供了一条全新的研究思路．本文就是在这一背景基础上总结了近几年来有关光敏色素和向光性方面研究的新进展．我们希望通过这样的工作能使有关植物向光性受体和植物体内吸收不同波长光的光受体?

简介：在米饭的Phytochromes被由三个成员，PHYA，PHYB，和PHYC组成的一个基因家庭编码。通过以photomorphogenesis描绘phytochrome异种和野类型(WT)，单个phytochromes的角色preliminarily在调整米饭de青白化，flowering时间和富饶被探索了。然而，很少信息都没关于是否或怎么被报导phytochromes在米饭影响叶绿素生合成和叶绿体开发。在这研究，我们比较了野类型和phyA的叶绿素内容，在任何一个白人光(WL)下面成年或红的phyB和phyAphyB异种点亮(R)。结果建议phyB察觉R断然调整叶绿素生合成，当phyA的角色能仅仅在phyB缺乏的异种被检测时。涉及叶绿素生合成的基因的表示层次的分析表明phytochromes由调整protochlorophylloxidoreductaseA(PORA)影响了叶绿素生合成表示。在叶绿体开发的phyB的角色也被分析，并且结果建议phyB察觉R由影响叶绿体和grana的数字调整叶绿体开发，以及叶绿体膜系统。

简介：TheexpressionpatternsofOsPIL11,oneofsixputativephytochrome-interactingfactors,wereanalyzedindifferentorgansoftransgenictobacco(Nicotianatabacum).TheexpressionofOsPIL11wasorgan-specificandwasregulatedbyleafdevelopment,abscisicacid(ABA),jasmonicacid(JA)andsalicylicacid(SA).TofurtherexploretheroleofOsPIL11inplantlightsignaltransduction,aplantexpressionvectorofOsPIL11wasconstructedandintroducedintotobacco.Whengrownundercontinuousredlight,OsPIL11-overexpressedtransgenictobaccoexhibitedshorterhypocotylsandlargercotyledonsandleavescomparedtowild-typeseedlings.Whengrownundercontinuousfar-redlight,however,transgenicandwild-typeseedlingsshowedsimilarphenotypes.TheseresultsindicatethatOsPIL11isinvolvedinredlightinducedde-etiolation,butnotinfar-redlightinducedde-etiolationintransgenictobacco,whichlaysthefoundationfordissectingthefunctionofOsPIL11inphytochrome-mediatedlightsignaltransductioninrice.

简介：Riceblack-streakeddwarfvirus(RBSDV)isarecognizedmemberofthegenusFijivirus,familyReoviridae.Itsgenomehastendouble-strandedRNA(dsRNA)segments(S1-S10),inwhichthefifthgenomesegment(S5)containstwoopenreadingframes(ORFs)withapartiallyoverlappingregion.ThesecondORFofRBSDVS5encodesaviralnonstructuralproteinnamedp5bwithunknownfunction.Torevealthefunctionofp5b,itsgenewasligatedintothebaitplasmidpGBKT7andanexpressionlibrarycontainingricecDNAswasconstructedusingplasmidpGADT7foryeasttwo-hybridassay.Thebaitproteinp5bwasdetectedinyeastbywesternblot,andtheresultofanauto-activationtestshowedthatp5bcouldnotautonomouslyactivatetheexpressionofreportergenesinyeast.Thenthebaitproteinp5bwasusedforscreeningthecDNAexpressionlibrariesofrice.Genefragmentsofsomepivotalenzymesinvolvedinphotosynthesis,respirationandotherimportantmetabolicprocesses,wereidentifiedtointeractwithp5binyeast,suggestingthattheseinteractionsmayplayrolesinsymptomdevelopmentininfectedplants.