以叶缘裂刻和叶缘锯齿的2种芥菜为试材,构建F_2和BC_1分离群体,对群体单株的裂刻性状进行调查,并对相关基因进行qRT-PCR分析,以期明确叶用芥菜叶缘裂刻性状的遗传规律,为芥菜育种提供参考依据。结果表明:芥菜叶缘裂刻性状由1对显性基因...以叶缘裂刻和叶缘锯齿的2种芥菜为试材,构建F_2和BC_1分离群体,对群体单株的裂刻性状进行调查,并对相关基因进行qRT-PCR分析,以期明确叶用芥菜叶缘裂刻性状的遗传规律,为芥菜育种提供参考依据。结果表明:芥菜叶缘裂刻性状由1对显性基因控制,将该基因命名为BjLB(Leaf-lobe in Brassica juncea);qRT-PCR分析结果表明,KNAT1基因在叶缘裂刻芥菜中的表达量高于叶缘锯齿芥菜的表达量,与预期结果一致,其它基因在2个亲本中表达差异不明显,推测KNAT1基因有可能是候选基因。展开更多
The class III homeodomain-leucine zipper(HD-Zip III)gene family plays important roles in plant growth and development,including regulation of apical embryo patterning,embryonic shoot meristem formation,leaf polarity,v...The class III homeodomain-leucine zipper(HD-Zip III)gene family plays important roles in plant growth and development,including regulation of apical embryo patterning,embryonic shoot meristem formation,leaf polarity,vascular development,and meristem function,with a particularly crucial function in leaf development.Although HD-Zip III members are highly conserved in land plants,previous studies,such as genetic analyses based on multiple mutants in Arabidopsis and other plants,suggest that various HD-Zip III family genes have evolved with distinct functions and pleiotropic effects on plant growth and development.In this study,we analyzed a HD-Zip III member,OsHox33,and demonstrated that it plays an important role in age-dependent leaf senescence in rice.We constructed two specific RNAi vectors derived from the 5′-end region and 3′-UTR of OsHox33 to knockdown its expression.Transgenic plants harboring either RNAi construct displayed similar phenotypes of precocious leaf senescence symptoms,suggesting that knockdown of OsHox33 accelerates leaf senescence in rice.pOsHox33::GUS fusion expression and RT-PCR revealed that OsHox33 is highly expressed in young organs,especially in young meristems such as shoot apical meristems,intercalary meristems,and young callus.In addition,real-time PCR indicated that OsHox33 was more highly expressed in young leaves than in old leaves.To further investigate OsHox33 function,we analyzed chloroplast ultrastructure in different-aged leaves of RNAi plants,and found that OsHox33 knockdown accelerated chloroplast degradation,which is consistent with RNAi phenotypes.Finally,real-time PCR studies showed that OsHox33 can regulate the expression of GS1 and GS2,two senescence-associated genes.Taken together,the work presented here provides new insights into the function of HD-Zip III members in plants.展开更多
文摘以叶缘裂刻和叶缘锯齿的2种芥菜为试材,构建F_2和BC_1分离群体,对群体单株的裂刻性状进行调查,并对相关基因进行qRT-PCR分析,以期明确叶用芥菜叶缘裂刻性状的遗传规律,为芥菜育种提供参考依据。结果表明:芥菜叶缘裂刻性状由1对显性基因控制,将该基因命名为BjLB(Leaf-lobe in Brassica juncea);qRT-PCR分析结果表明,KNAT1基因在叶缘裂刻芥菜中的表达量高于叶缘锯齿芥菜的表达量,与预期结果一致,其它基因在2个亲本中表达差异不明显,推测KNAT1基因有可能是候选基因。
基金supported by the National Natural Science Foundation of China(31171515)the Tianjin Natural Science Foundation of China(11JCZDJC17900)the Knowledge Innovation and Training Program of Tianjin,Tianjin Municipal Education Commission(2013-1-2015-12)
文摘The class III homeodomain-leucine zipper(HD-Zip III)gene family plays important roles in plant growth and development,including regulation of apical embryo patterning,embryonic shoot meristem formation,leaf polarity,vascular development,and meristem function,with a particularly crucial function in leaf development.Although HD-Zip III members are highly conserved in land plants,previous studies,such as genetic analyses based on multiple mutants in Arabidopsis and other plants,suggest that various HD-Zip III family genes have evolved with distinct functions and pleiotropic effects on plant growth and development.In this study,we analyzed a HD-Zip III member,OsHox33,and demonstrated that it plays an important role in age-dependent leaf senescence in rice.We constructed two specific RNAi vectors derived from the 5′-end region and 3′-UTR of OsHox33 to knockdown its expression.Transgenic plants harboring either RNAi construct displayed similar phenotypes of precocious leaf senescence symptoms,suggesting that knockdown of OsHox33 accelerates leaf senescence in rice.pOsHox33::GUS fusion expression and RT-PCR revealed that OsHox33 is highly expressed in young organs,especially in young meristems such as shoot apical meristems,intercalary meristems,and young callus.In addition,real-time PCR indicated that OsHox33 was more highly expressed in young leaves than in old leaves.To further investigate OsHox33 function,we analyzed chloroplast ultrastructure in different-aged leaves of RNAi plants,and found that OsHox33 knockdown accelerated chloroplast degradation,which is consistent with RNAi phenotypes.Finally,real-time PCR studies showed that OsHox33 can regulate the expression of GS1 and GS2,two senescence-associated genes.Taken together,the work presented here provides new insights into the function of HD-Zip III members in plants.
