CAJ | 학술논문

为了探讨水分胁迫及复水对甜菜生产及其相应光合参数的影响,为甜菜田水分管理提供依据,采用人工防雨棚,设置了不同时期水分胁迫及复水的池栽试验,研究甜菜净光合速率(Pn)、蒸腾速率(Tr)、水分利用效率(WUE)及气孔限制值(Ls)、胞间CO2浓度(Ci)、PSⅡ最大光化学量子产量(Fv/Fm)的变化.结果表明,全生育期补水(CK)处理不同时期甜菜Tr与Pn日变化近"单峰"型,缺水使其呈现"双峰"变化.水分胁迫使甜菜糖分积累期日蒸腾量(DTC)降低70.16%~74.81%,日光合量(DPC)降低63.48%~69.96%,日水分利用效率(WUEd)则提高19.28%~22.39%;胁迫后复水促使Tr与Pn恢复,但不能达到未受胁迫水平.极度缺水环境下Ls日变化具有午间低谷的"双峰"特征,Ci出现与Ls时序一致的"双谷"特征,水分胁迫导致了午间PSⅡ光化学反应中心的抑制与失活.水分胁迫导致Pn与Tr的非可逆性降低及Pn低效期的延长,成为影响甜菜生产的重要原因.
위료탐토수분협박급복수대첨채생산급기상응광합삼수적영향,위첨채전수분관리제공의거,채용인공방우붕,설치료불동시기수분협박급복수적지재시험,연구첨채정광합속솔(Pn)、증등속솔(Tr)、수분이용효솔(WUE)급기공한제치(Ls)、포간CO2농도(Ci)、PSⅡ최대광화학양자산량(Fv/Fm)적변화.결과표명,전생육기보수(CK)처리불동시기첨채Tr여Pn일변화근"단봉"형,결수사기정현"쌍봉"변화.수분협박사첨채당분적루기일증등량(DTC)강저70.16%~74.81%,일광합량(DPC)강저63.48%~69.96%,일수분이용효솔(WUEd)칙제고19.28%~22.39%;협박후복수촉사Tr여Pn회복,단불능체도미수협박수평.겁도결수배경하Ls일변화구유오간저곡적"쌍봉"특정,Ci출현여Ls시서일치적"쌍곡"특정,수분협박도치료오간PSⅡ광화학반응중심적억제여실활.수분협박도치Pn여Tr적비가역성강저급Pn저효기적연장,성위영향첨채생산적중요원인.
To investigate the effect of water stress and rewatering on sugar beet yield and its corresponding photosynthetic parameters, and to provide the basis of water management for the sugar beet fields, pool experiments in an artificial proof canopy were set up to observe changes of beet net photosynthetic rate(Pn), transpiration rate(Tr), water use efficiency(WUE)and stomatal limitation(Ls), intercellular CO2 con-centration(Ci), and PSⅡmaximum quantum yield(Fv/Fm). The results indicated that the diurnal variation of Tr and Pn in CK treatment (whole growth period replenishment)at different times near"unimodal"type;and water shortage treatments presented"twin peaks"change. Diurnal transpiration capacity(DTC)under water stress at sugar accumulation stage reduced by 70.16%~74.81%and diurnal photosynthetic capacity(DPC)was 63.48%~69.96%lower than that of CK, while diurnal water use efficiency(WUEd)increased by 19.28%~22.39%. Rehydration helped Tr and Pn recovery, but did not reach unstressed levels. Ls changes under extremely dry environment had a midday trough "twin peaks"feature, and Ci was at"double-dip" in consistent with the timing of Ls;Water stress inhibited and inactivated photo-chemical reaction center of midday PSⅡ. Water stress led to irreversible decrease in the Pn and Tr, and prolonged the Pn inefficient period, which become the important factor of influencing the sugar beet yield.