Root cap not only protects root meristem,but also detects and transduces the signals of environmental changes to affect root development.The symplastic communication is an important way for plants to transduce signals...Root cap not only protects root meristem,but also detects and transduces the signals of environmental changes to affect root development.The symplastic communication is an important way for plants to transduce signals to coordinate the development and physiology in response to the changing enviroments.However,it is unclear how the symplastic communication between root cap cells affects root growth.Here we exploit an inducible system to specifically block the symplastic communication in the root cap.Transient blockage of plasmodesmata(PD)in differentiated collumella cells severely impairs the root development in Arabidopsis,in particular in the stem cell niche and the proximal meristem.The neighboring stem cell niche is the region that is most sensitive to the disrupted symplastic communication and responds rapidly via the alteration of auxin distribution.In the later stage,the cell division in proximal meristem is inhibited,presumably due to the reduced auxin level in the root cap.Our results reveal the essential role of the differentiated collumella cells in the root cap mediated signaling system that directs root development.展开更多
Plants are frequently exposed to herbivory and mechanical damage that result in wounding.Two fundamental strategies,regeneration and healing,are employed by plants upon wounding.How plants make different decisions and...Plants are frequently exposed to herbivory and mechanical damage that result in wounding.Two fundamental strategies,regeneration and healing,are employed by plants upon wounding.How plants make different decisions and how wound healing is sustained until the damaged tissues recover are not fully understood.In this study,we found that local auxin accumulation patterns,determined by wounding modes,may activate different recovery programs in wounded tissues.Wounding triggers transient jasmonic acid(JA)signaling that promotes lignin deposition in the first few hours after wounding occurs.This early response is subsequently relayed to ABA signaling via MYC2.The induced JA signaling promotes ABA biosynthesis to maintain the expression of RAP2.6,a key factor for sustained lignin biosynthesis and the later wound-healing process.Our findings provide mechanistic insights into how plants heal from wounding and clarify the molecular mechanisms that underlie the prolonged healing process following wounding.展开更多
基金This work is supported by the National Key Research and Development Program of China(2018YFD1000800)the grant from the National Natural Science Foundation of China(31900169).
文摘Root cap not only protects root meristem,but also detects and transduces the signals of environmental changes to affect root development.The symplastic communication is an important way for plants to transduce signals to coordinate the development and physiology in response to the changing enviroments.However,it is unclear how the symplastic communication between root cap cells affects root growth.Here we exploit an inducible system to specifically block the symplastic communication in the root cap.Transient blockage of plasmodesmata(PD)in differentiated collumella cells severely impairs the root development in Arabidopsis,in particular in the stem cell niche and the proximal meristem.The neighboring stem cell niche is the region that is most sensitive to the disrupted symplastic communication and responds rapidly via the alteration of auxin distribution.In the later stage,the cell division in proximal meristem is inhibited,presumably due to the reduced auxin level in the root cap.Our results reveal the essential role of the differentiated collumella cells in the root cap mediated signaling system that directs root development.
基金supported bygrants from the National Natural ScienceFoundation of China(32400270 and 32425050).
文摘Plants are frequently exposed to herbivory and mechanical damage that result in wounding.Two fundamental strategies,regeneration and healing,are employed by plants upon wounding.How plants make different decisions and how wound healing is sustained until the damaged tissues recover are not fully understood.In this study,we found that local auxin accumulation patterns,determined by wounding modes,may activate different recovery programs in wounded tissues.Wounding triggers transient jasmonic acid(JA)signaling that promotes lignin deposition in the first few hours after wounding occurs.This early response is subsequently relayed to ABA signaling via MYC2.The induced JA signaling promotes ABA biosynthesis to maintain the expression of RAP2.6,a key factor for sustained lignin biosynthesis and the later wound-healing process.Our findings provide mechanistic insights into how plants heal from wounding and clarify the molecular mechanisms that underlie the prolonged healing process following wounding.
