CAJ | 학술논문

小麦幼苗经-0.5 MPa聚乙二醇(PEG-6000)溶液暗中渗透胁迫0、6、12、18、24、30、36、42、48 h，叶片的总呼吸速率(Vt)呈现先上升后降低的趋势，交替途径呼吸也表现出相同的变化模式。水分胁迫初期(0～12 h)，交替途径容量(Valt)、实际运行活性(ρValt)及运行系数(ρ值)均上升，此后(18～48 h)逐渐下降。水分胁迫也影响了呼吸电子流在2条呼吸途径中的分配比例。胁迫初期的0～12 h内，流经交替途径的电子流增多，而流向细胞色素主路的电子流减少；但随着胁迫时间的延长，交替途径的贡献降低，而细胞色素主路的贡献增加。说明小麦叶片的抗氰呼吸在水分胁迫初期被诱导增加，而随着胁迫进程的延长又表现为下降。
소맥유묘경-0.5 MPa취을이순(PEG-6000)용액암중삼투협박0、6、12、18、24、30、36、42、48 h，협편적총호흡속솔(Vt)정현선상승후강저적추세，교체도경호흡야표현출상동적변화모식。수분협박초기(0～12 h)，교체도경용량(Valt)、실제운행활성(ρValt)급운행계수(ρ치)균상승，차후(18～48 h)축점하강。수분협박야영향료호흡전자류재2조호흡도경중적분배비례。협박초기적0～12 h내，류경교체도경적전자류증다，이류향세포색소주로적전자류감소；단수착협박시간적연장，교체도경적공헌강저，이세포색소주로적공헌증가。설명소맥협편적항청호흡재수분협박초기피유도증가，이수착협박진정적연장우표현위하강。
When wheat seedlings were root-stressed osmotically in -0.5 MPa polyethylene glycol (PEG) solutions in dark for 0,6,12,18,24,30,36,42,48 h,leaf total respiratory rate (Vt) increased at first within the 0～12 h of stress but decreased afterwards.So were the changes of alternative pathway capacity (Valt),its actual operation activity (ρValt) and engagement (ρ value).The Valt/Vt ratio and the contribution of alternative pathway to total respiration (ρValt/Vt) also increased at the early stage of water stress.In addition,water stress led to a reallocation of respiratory electron flow between two respiratory pathways.During the first 12 h of water stress,electron flux flowed through the alternative pathway increased,but afterwards it diverted to cytchrome pathway and led to an increase of the contribution of cytochrome pathway.These results suggest that the cyanide-resistant respiration of wheat leaves was induced at the onset of water stress but suppressed under further stress conditions.