不同灌水模式对南方辣椒叶绿素荧光参数的影响

摘要

In order to realize water-saving, high quality and high yield of hot pepper by scientifically and rationally regulating soil water, the influence of different irrigation patterns on chlorophyll fluorescence parameters of hot pepper under the condition of rain-shelter with OS5-FL modulated chlorophyll fluorometer was studied. The results showed that with the reduce of irrigation water volume, hot pepper variable fluorescence(Fv)、 maximum fluorescence(Fm)% the ratio of the variable to maximum fluorescence(Fv/Fm), the ratio of the variable to minimal fluorescence(Fv/Fo) and the photochemical quenching coefficient(qp) and non-photochemical quenching coefficient(Qn) at the four growing stage decreased, while the minimal fluorescence(Fo) raised. Analysis indicated that photosystem II damaged, and primary light energy conversion of PSlI(Fv/Fm), potential activities of PSII(Fv/Fo) decreased, photosynthetic electron transport, photosynthetic primary reaction inhibited, the ability of heat disseminate increased. In the three treatments of DI50, 1PRD and 2PRD. Chlorophyll fluorescence parameters of hot pepper under 1PRD changed smaller compared to CK. However, the chlorophyll fluorescence parameters were not significantly affected by irrigation patterns during four measurement.%为了实现辣椒节水、优质、高效生产,在避雨栽培条件下,利用OS5-FL调制荧光仪研究了不同灌水模式对辣椒叶绿素荧光参数的影响.结果表明,在4个生育阶段,辣椒的可变荧光、最大荧光、可变荧光与最大荧光比、可变荧光与初始荧光比、光化学淬灭系数与非光化学淬灭系数均随着灌水量的减少而降低,而初始荧光则随着灌水量的减少而升高.说明辣椒叶片PSⅡ反应中心因水分胁迫而受到了破坏,使PSⅡ原初光能转换效率和PSⅡ潜在活性降低,使光合电子传递、光合原初反应过程及热耗散能力受到抑制.DI50、2PRD和1PRD 3种处理下的辣椒各叶绿素荧光参数虽然在4次观测中均未表现出显著差异,但1PRD处理与对照相比变化最小.该研究可为南方避雨栽培下辣椒灌水模式的选择和节水、优质、高产辣椒栽培提供参考.