We studied pot cultivated Haloxylon ammodendron＇s growth, physiological changes and drought resistance under NaC1, H2SiO3, and NaCl＋H2SiO3 treatments. Results show that 0.3 g/kg NaC1, 0.2 g/kg HzSiO3 or 0.3 g/kg NaC...We studied pot cultivated Haloxylon ammodendron＇s growth, physiological changes and drought resistance under NaC1, H2SiO3, and NaCl＋H2SiO3 treatments. Results show that 0.3 g/kg NaC1, 0.2 g/kg HzSiO3 or 0.3 g/kg NaCI＋0.1 g/kg H2SiO3 treatments can effectively promote growth and improve the drought resistance of/-L, ammodendron. Compared with that without NaCI treatment, H. ammodendron＇s height, crown diameter and fresh weight increased by 42%, 91% and 62% respectively under 0.3 g/kg NaC1 treatment, and its main stem diameter, main root diameter and main root length increased by 40%, 39% and 23%, respectively. Compared with that without H2SiO3 treatments, H. ammodendron＇s height, crown diameter and flesh weight increased by 36%, 45% and 27% respectively under 0.2 g/kg HeSiO3 treatment, and its main stem diameter, main root diameter and main root length increased by 23%, 23% and 20%, respectively. Compared with that under 0.3 g/kg NaC1 treatment, H. ammodendron＇s height, crown diameter and fresh weight and main root length increased by 9%, 10%, 17% and 12% respectively under 0.3 g/kg NaCI＋0.1 g/kg H2SiO3 treatment. Compared with that under 0.1 g/kg H2SiO3 treatment, H. ammodendron＇s height, crown diame- ter and fresh weight increased by 28%, 76% and 68% respectively under 0.3 g/kg NaCI＋0.1 g/kg H2SiO3 treatment, and its main stem diameter, main root diameter and main root length increased by 30%, 32% and 27%, respectively. This suggests that moder- ate levels of NaCI＋H2SiO3 interaction can effectively promote growth and improve drought resistance of/-L, ammodendron than separate applications of NaC1 or H2SiO3.展开更多
Aphids represent a major threat to crops.Hundreds of different viruses are aphid-borne.Upon aphid attack,plants release volatile organic compounds(VOCs)as airborne alarm signals to turn on the airborne defense(AD)of n...Aphids represent a major threat to crops.Hundreds of different viruses are aphid-borne.Upon aphid attack,plants release volatile organic compounds(VOCs)as airborne alarm signals to turn on the airborne defense(AD)of neighboring plants,thereby repelling aphids as well as reducing aphid fitness and virus transmission.This phenomenon provides a critical community-wide plant protection to fend off aphids,but the underlying molecular basis remains undetermined for a long time.In a recent article,Gong et al.established the NAC2-SAMT1 module as the core component regulating the emission of methyl-salicylate(MeSA),a major component of VOCs in aphid-attacked plants.Furthermore,they showed that SABP2 protein is critical for the perception of volatile MeSA signal by converting MeSA to Salicylic Acid(SA),which is the cue to elicit AD against aphids at the community level.Moreover,they showed that multiple viruses use a conserved glycine residue in the ATP-dependent helicase domain in viral proteins to shuttle NAC2 from the nucleus to the cytoplasm for degradation,leading to the attenuation of MeSA emission and AD.These findings illuminate the functional roles of key regulators in the complex MeSA-mediated airborne defense process and a counter-defense mechanism used by viruses,which has profound significance in advancing the knowledge of plant-pathogen interactions as well as providing potential targets for gene editing-based crop breeding.展开更多
基金supported by the National Agricultural Sci-Tech Transformation Foundation of China (Grant No. 2009GB23600512)the National Natural Science Foundation of China (Grant No. 30770347)the National Scientific Research Special Funds of Public Service Sectors of Forestry of China (Grant No. 201004045)
文摘We studied pot cultivated Haloxylon ammodendron＇s growth, physiological changes and drought resistance under NaC1, H2SiO3, and NaCl＋H2SiO3 treatments. Results show that 0.3 g/kg NaC1, 0.2 g/kg HzSiO3 or 0.3 g/kg NaCI＋0.1 g/kg H2SiO3 treatments can effectively promote growth and improve the drought resistance of/-L, ammodendron. Compared with that without NaCI treatment, H. ammodendron＇s height, crown diameter and fresh weight increased by 42%, 91% and 62% respectively under 0.3 g/kg NaC1 treatment, and its main stem diameter, main root diameter and main root length increased by 40%, 39% and 23%, respectively. Compared with that without H2SiO3 treatments, H. ammodendron＇s height, crown diameter and flesh weight increased by 36%, 45% and 27% respectively under 0.2 g/kg HeSiO3 treatment, and its main stem diameter, main root diameter and main root length increased by 23%, 23% and 20%, respectively. Compared with that under 0.3 g/kg NaC1 treatment, H. ammodendron＇s height, crown diameter and fresh weight and main root length increased by 9%, 10%, 17% and 12% respectively under 0.3 g/kg NaCI＋0.1 g/kg H2SiO3 treatment. Compared with that under 0.1 g/kg H2SiO3 treatment, H. ammodendron＇s height, crown diame- ter and fresh weight increased by 28%, 76% and 68% respectively under 0.3 g/kg NaCI＋0.1 g/kg H2SiO3 treatment, and its main stem diameter, main root diameter and main root length increased by 30%, 32% and 27%, respectively. This suggests that moder- ate levels of NaCI＋H2SiO3 interaction can effectively promote growth and improve drought resistance of/-L, ammodendron than separate applications of NaC1 or H2SiO3.
基金supported by the US National Science Foundation(MCB-1906060 and MCB-2145967 to Y.W.)。
文摘Aphids represent a major threat to crops.Hundreds of different viruses are aphid-borne.Upon aphid attack,plants release volatile organic compounds(VOCs)as airborne alarm signals to turn on the airborne defense(AD)of neighboring plants,thereby repelling aphids as well as reducing aphid fitness and virus transmission.This phenomenon provides a critical community-wide plant protection to fend off aphids,but the underlying molecular basis remains undetermined for a long time.In a recent article,Gong et al.established the NAC2-SAMT1 module as the core component regulating the emission of methyl-salicylate(MeSA),a major component of VOCs in aphid-attacked plants.Furthermore,they showed that SABP2 protein is critical for the perception of volatile MeSA signal by converting MeSA to Salicylic Acid(SA),which is the cue to elicit AD against aphids at the community level.Moreover,they showed that multiple viruses use a conserved glycine residue in the ATP-dependent helicase domain in viral proteins to shuttle NAC2 from the nucleus to the cytoplasm for degradation,leading to the attenuation of MeSA emission and AD.These findings illuminate the functional roles of key regulators in the complex MeSA-mediated airborne defense process and a counter-defense mechanism used by viruses,which has profound significance in advancing the knowledge of plant-pathogen interactions as well as providing potential targets for gene editing-based crop breeding.
