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[PB-0007] Gene integration approach detected QTLs Associated with Bakanae disease resistance in rice
Sais-Beul Lee(Sais-Beul Lee),Hyunggon Mang(Hyunggon Mang),Ju-Won Kang(Ju-Won Kang),Ji-Yoon Lee(Ji-Yoon Lee),Nkulu Rolly Kabange(Nkulu Rolly Kabange ),Yeongho Kwon(Yeongho Kwon),Gi-Un Seong(Gi-Un Seong 한국육종학회 2022 한국육종학회 공동학술발표집 Vol.2022 No.-
[PB-0006] A novel resistance gene for bakanae disease in rice, qBK4T identified by GWAS
Sais-Beul Lee(Sais-Beul Lee),Ju-Won Kang(Ju-Won Kang),Ji-Yoon Lee(Ji-Yoon Lee),Nkulu Rolly Kabange(Nkulu Rolly Kabange ),Hyunggon Mang(Hyunggon Mang),Yeongho Kwon(Yeongho Kwon),Gi-Un Seong(Gi-Un Seong 한국육종학회 2022 한국육종학회 공동학술발표집 Vol.2022 No.-
Hye-Young Lee(이혜영),Ye-Eun Seo(서예은),Soohyun Oh(오수현),Hyunggon Mang(맹형곤),Doil Choi(최도일) 한국원예학회 2021 한국원예학회 학술발표요지 Vol.2021 No.10
Hypersensitive response (HR) is a robust immune response mediated by nucleotide-binding, leucine-rich repeat receptors (NLRs). However, the early molecular event that links activated NLRs to cell death is unclear. Here, we demonstrate that NLRs target plasma membrane H<SUP>+</SUP>-ATPases (PMAs) that generate electrochemical potential, an essential component of living cells, across the plasma membrane. CC<SUP>A</SUP>309, an autoactive N-terminal domain of a coiled-coil NLR (CNL), associates with PMAs. Silencing or overexpression of PMAs reversibly affects cell death induced by CC<SUP>A</SUP>309. CC<SUP>A</SUP>309-induced apoplast alkalization causes plasma membrane depolarization, followed by cell death. Co-immunoprecipitation analyses suggest that CC<SUP>A</SUP>309 inhibits PMA activation by pre-occupying the dephosphorylated penultimate threonine residue of PMA. Moreover, pharmacological experiments using fusicoccin, an irreversible PMA activator, showed that inhibition of PMAs contributes to CNL-type (but not TNL-type) resistance proteins-induced cell death. We suggest PMAs as primary targets of plasma membrane-associated CNLs leading to HR-associated cell death by disturbing the electrochemical gradient across the membrane. These results provide new insight into NLR-mediated cell death in plants.
Lee, Yuree,Yoon, Taek Han,Lee, Jiyoun,Jeon, So Yeon,Lee, Jae Ho,Lee, Mi Kyoung,Chen, Huize,Yun, Ju,Oh, Se Yun,Wen, Xiaohong,Cho, Hui Kyung,Mang, Hyunggon,Kwak, June M. Elsevier 2018 Cell Vol.173 No.6
<P><B>Summary</B></P> <P>The cell wall, a defining feature of plants, provides a rigid structure critical for bonding cells together. To overcome this physical constraint, plants must process cell wall linkages during growth and development. However, little is known about the mechanism guiding cell-cell detachment and cell wall remodeling. Here, we identify two neighboring cell types in <I>Arabidopsis</I> that coordinate their activities to control cell wall processing, thereby ensuring precise abscission to discard organs. One cell type produces a honeycomb structure of lignin, which acts as a mechanical “brace” to localize cell wall breakdown and spatially limit abscising cells. The second cell type undergoes transdifferentiation into epidermal cells, forming protective cuticle, demonstrating <I>de novo</I> specification of epidermal cells, previously thought to be restricted to embryogenesis. Loss of the lignin brace leads to inadequate cuticle formation, resulting in surface barrier defects and susceptible to infection. Together, we show how plants precisely accomplish abscission.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Two neighboring cell types coordinate cellular activities for organ separation </LI> <LI> A honeycomb structure of lignin acts as a “molecular brace” </LI> <LI> The lignin brace spatially restricts cell wall breakdown </LI> <LI> Lignin deposition ensures surface integrity of transdifferentiated epidermal cells </LI> </UL> </P> <P><B>Graphical Abstract</B></P> <P>[DISPLAY OMISSION]</P>