Rhizosheath development benefits drought resistance in many upland crops.Although water-saving irrigation techniques induce rice rhizosheath formation,how and whether root hairs and different root types influence rice...Rhizosheath development benefits drought resistance in many upland crops.Although water-saving irrigation techniques induce rice rhizosheath formation,how and whether root hairs and different root types influence rice rhizosheath development and shoot water relations at seedling stage in drying soil are unclear.Wild-type(WT)seedlings with root hairs and its root hairless mutant rth2 were watered every 2 or 4 d,with root hair,whole root and shoot traits determined.Less frequent irrigation significantly increased rhizosheath of both genotypes by 14%during the seedling stage.Although root exudates from rth2 adhered 54%more soil than WT,facilitating rhizosheath development,root hairs and 25%greater lateral root proliferation of WT seedlings allowed 48%more rhizosheath especially in older seedlings.Greater root hair length,root hair length density and root hair number/root surface area on lateral than axial roots especially enhanced WT rhizosheath development.Soil water deficit increased root and leaf ABA concentrations especially in WT seedlings,causing stomatal closure that contributed to increased leaf water potential.In 36-d-old seedlings,10%greater shoot biomass of WT plants than rth2 accompanied 15%higher root and 36%higher foliar ABA concentrations and ultimately lower stomatal conductance.Higher ABA concentrations of WT plants at the same soil moisture suggested root hairs may be important in mediating shoot water status of rice seedlings.展开更多
Dear Editor, Cyclophilins （CYP） are a class of highly conserved pepti- dyl-prolyl cis-trans isomerases （PPlases） that play important roles in various biological processes in eukaryotes （reviewed in Romano et al....Dear Editor, Cyclophilins （CYP） are a class of highly conserved pepti- dyl-prolyl cis-trans isomerases （PPlases） that play important roles in various biological processes in eukaryotes （reviewed in Romano et al. （2004））. In higher plants, a conserved sin- gle domain cyclophilin has been identified as a novel com- ponent of the auxin signaling pathway by analyzing the tomato diageotropica （dgt） mutant （Ivanchenko et al., 2006; Oh et al., 2006）. The dgt mutant displays a lateral-rootless and auxin-resistant phenotype （Ivanchenko et aL, 2006）. Further studies revealed that mutations in the DGT-like genes of Physcomitrella patens also exhibited an auxin-resistant phenotype, suggesting a conserved role of DGT-like proteins in auxin signaling. Moreover,展开更多
基金financially supported by the National Natural Science Foundation of China (32071943, 31872853, 31871557)Jiangsu Provincial Department of Education and Yangzhou University (JS-2020-217)+3 种基金Zhejiang A&F University Research Development Fund (2023LFR003)in receipt of a Newton Advanced Fellowship (NA160430)the European Union SHui Project (773903)the GCRF RECIRCULATE (ES/P010857/1) Project
文摘Rhizosheath development benefits drought resistance in many upland crops.Although water-saving irrigation techniques induce rice rhizosheath formation,how and whether root hairs and different root types influence rice rhizosheath development and shoot water relations at seedling stage in drying soil are unclear.Wild-type(WT)seedlings with root hairs and its root hairless mutant rth2 were watered every 2 or 4 d,with root hair,whole root and shoot traits determined.Less frequent irrigation significantly increased rhizosheath of both genotypes by 14%during the seedling stage.Although root exudates from rth2 adhered 54%more soil than WT,facilitating rhizosheath development,root hairs and 25%greater lateral root proliferation of WT seedlings allowed 48%more rhizosheath especially in older seedlings.Greater root hair length,root hair length density and root hair number/root surface area on lateral than axial roots especially enhanced WT rhizosheath development.Soil water deficit increased root and leaf ABA concentrations especially in WT seedlings,causing stomatal closure that contributed to increased leaf water potential.In 36-d-old seedlings,10%greater shoot biomass of WT plants than rth2 accompanied 15%higher root and 36%higher foliar ABA concentrations and ultimately lower stomatal conductance.Higher ABA concentrations of WT plants at the same soil moisture suggested root hairs may be important in mediating shoot water status of rice seedlings.
基金This work was supported by grants from the National Natural Science Foundation of China （No. 31071385）, the Joint Research Program between the Zhejiang Academy of Agricultural Sciences and the Chinese Academy of Sciences, the Fundamental Program of Zhejiang Academy of Agricultural Sciences, the Zhejiang Provincial Natural ScienceFoundation of China （No. Z3110509）, and the grant from the Ministry of Agriculture of China （No. 2011ZX08010002）. No conflict of interest declared.Yuezhi Tao/Hua Wang group and Jianru Zuo group contributed equally to this work.
文摘Dear Editor, Cyclophilins （CYP） are a class of highly conserved pepti- dyl-prolyl cis-trans isomerases （PPlases） that play important roles in various biological processes in eukaryotes （reviewed in Romano et al. （2004））. In higher plants, a conserved sin- gle domain cyclophilin has been identified as a novel com- ponent of the auxin signaling pathway by analyzing the tomato diageotropica （dgt） mutant （Ivanchenko et al., 2006; Oh et al., 2006）. The dgt mutant displays a lateral-rootless and auxin-resistant phenotype （Ivanchenko et aL, 2006）. Further studies revealed that mutations in the DGT-like genes of Physcomitrella patens also exhibited an auxin-resistant phenotype, suggesting a conserved role of DGT-like proteins in auxin signaling. Moreover,
