Cytokinin as a positional cue regulating lateral root spacing in Arabidopsis
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- 英文论文题名：Cytokinin as a positional cue regulating lateral root spacing in Arabidopsis
- 论文作者：Ling Chang ; Eswarayya Ramireddy ; Thomas Schmülling
- 英文论文作者：Ling Chang ; Eswarayya Ramireddy ; Thomas Schmülling ; Institute of Biology/Applied Genetics ; Dahlem Centre of Plant Sciences (DCPS) ; Freie Universit?t Berlin ; Present address ; Hubei Collaborative Innovation Center for Green Transformation of Bio -Resources ; College of Life Science ; Hubei University
- 年：2016
- 作者机构：Institute of Biology/Applied Genetics,Dahlem Centre of Plant Sciences (DCPS),Freie Universit?t Berlin;Present address: Hubei Collaborative Innovation Center for Green Transformation of Bio -Resources,College of Life Science,Hubei University;
- 英文论文关键词：Arabidopsis thaliana ; cytokinin ; lateral root ; lateral root spacing ; root branching ; root system architecture
- 会议召开时间：2016-10-09
- 会议录名称：2016年全国植物生物学大会摘要集
- 语种：英文
- 分类号：Q945
- 学会代码：ZGZO
- 会议名称：2016年全国植物生物学大会
- 会议地点：中国湖北武汉
- 主办单位：中国遗传学会、中国细胞生物学学会、中国植物学会、中国植物生理与植物分子生物学学会、中国作物学会
- 学会名称：中国植物学会
- 页数：1
- 文件大小：851k
- 原文格式：D
- 会议级别：全国
摘要
The root systems of plants have developed adaptive architectures to exploit soil resources. The formation of lateral roots(LRs) contributes to root system architecture. Roots of plants with a lower cytokinin status form LR primordia(LRP) in unusually close proximity,indicating a role for the hormone in regulating the positioning of LRs along the main root axis. Data obtained from cytokinin-synthesis mutants of Arabidopsis thaliana combined with gene expression analysis indicate that cytokinin synthesis by IPT5 and LOG4 occurring early during LRP initiation generates a local cytokinin signal abbreviating LRP formation in neighbouring pericycle cells. In addition,IPT3,IPT5,and IPT7 contribute to cytokinin synthesis in the vicinity of existing LRP,thus suppressing initiation of new LRs. Interestingly,mutation of CYP735 A genes required for trans-zeatin biosynthesis caused strong defects in LR positioning,indicating an important role for this cytokinin metabolite in regulating LR spacing. Further it is shown that cytokinin and a known regulator of LR spacing,the receptor-like kinase ARABIDOPSIS CRINKLY4(ACR4),operate in a non-hierarchical manner but might exert reciprocal control at the transcript level. Taken together,the results suggest that cytokinin acts as a paracrine hormonal signal in regulating root system architecture.
The root systems of plants have developed adaptive architectures to exploit soil resources. The formation of lateral roots(LRs) contributes to root system architecture. Roots of plants with a lower cytokinin status form LR primordia(LRP) in unusually close proximity,indicating a role for the hormone in regulating the positioning of LRs along the main root axis. Data obtained from cytokinin-synthesis mutants of Arabidopsis thaliana combined with gene expression analysis indicate that cytokinin synthesis by IPT5 and LOG4 occurring early during LRP initiation generates a local cytokinin signal abbreviating LRP formation in neighbouring pericycle cells. In addition,IPT3,IPT5,and IPT7 contribute to cytokinin synthesis in the vicinity of existing LRP,thus suppressing initiation of new LRs. Interestingly,mutation of CYP735 A genes required for trans-zeatin biosynthesis caused strong defects in LR positioning,indicating an important role for this cytokinin metabolite in regulating LR spacing. Further it is shown that cytokinin and a known regulator of LR spacing,the receptor-like kinase ARABIDOPSIS CRINKLY4(ACR4),operate in a non-hierarchical manner but might exert reciprocal control at the transcript level. Taken together,the results suggest that cytokinin acts as a paracrine hormonal signal in regulating root system architecture.
The root systems of plants have developed adaptive architectures to exploit soil resources. The formation of lateral roots(LRs) contributes to root system architecture. Roots of plants with a lower cytokinin status form LR primordia(LRP) in unusually close proximity,indicating a role for the hormone in regulating the positioning of LRs along the main root axis. Data obtained from cytokinin-synthesis mutants of Arabidopsis thaliana combined with gene expression analysis indicate that cytokinin synthesis by IPT5 and LOG4 occurring early during LRP initiation generates a local cytokinin signal abbreviating LRP formation in neighbouring pericycle cells. In addition,IPT3,IPT5,and IPT7 contribute to cytokinin synthesis in the vicinity of existing LRP,thus suppressing initiation of new LRs. Interestingly,mutation of CYP735 A genes required for trans-zeatin biosynthesis caused strong defects in LR positioning,indicating an important role for this cytokinin metabolite in regulating LR spacing. Further it is shown that cytokinin and a known regulator of LR spacing,the receptor-like kinase ARABIDOPSIS CRINKLY4(ACR4),operate in a non-hierarchical manner but might exert reciprocal control at the transcript level. Taken together,the results suggest that cytokinin acts as a paracrine hormonal signal in regulating root system architecture.
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