水分胁迫对2个蓝莓品种叶绿素荧光特性的影响

Effects of soil water stress on chlorophyll fluorescence characteristic of two blueberry varieties

以‘莱格西’和‘灿烂’2个蓝莓品种为试验材料,采用盆栽试验进行水分胁迫(干旱胁迫、水淹胁迫),研究水分胁迫对2个品种蓝莓叶生长、叶绿素含量及叶绿素荧光特性的影响。结果表明:1)随着水分胁迫程度的加剧,‘莱格西’和‘灿烂’的叶长、叶宽、比叶重整体呈下降趋势;2)叶绿素含量随着水分胁迫程度的加剧而显著降低(P <0.05),二者的总叶绿素含量在重度水淹胁迫下分别下降77.14%和55.82%,下降至最小值;3)在水分胁迫下2个蓝莓品种的PSⅡ光反应中心受到一定程度的伤害,最小荧光(F0)、非光化学淬灭(qN)呈上升趋势,而最大荧光(Fm)、可变荧光(Fv)、PSⅡ原初光能转化效率(Fv/Fm)、PSⅡ的潜在活性(Fv/F0)和光化学淬灭(qP)呈下降趋势,以‘莱格西’的光合系统受影响较大。本研究说明蓝莓品种‘灿烂’比‘莱格西’具有较强的耐旱性和耐淹性。

In order to study the effect of water stress on theleaf growth, chlorophyll content and chlorophyll fluorescence characteristics of blueberry, using ‘Legacy’ and ‘Britewellt’ as experimental materials to carry out water stress(drought stress, waterlogging stress) in pot experiment. The results were as follows: 1)With the increase of water stress, the leaf length, leaf width and specific leaf weight of ‘Legacy’ and ‘Britewellt’ showed a downward trend. 2) chlorophyll content decreased significantly(P < 0.05) with the increase of water stress degree. Under severe waterlogging stress, the total chlorophyll content decreased by 77.14% and 55.82% respectively to the minimum. 3) the PS Ⅱ reaction center of blueberry was damaged under water stress, the minimal fluorescence(F0) and non-photochemical quenching(qN) showed a upward trend, while the maximal fluorescence(Fm), variable fluorescence(Fv), light energy transformation efficiency of PS Ⅱ(Fv/Fm), activity potential of PS Ⅱ(Fv/F0) and photochemical quenching(qP) showed a trend of decline, and the photosynthesis system of ‘Legacy’ was greatly influenced by water stress. This study showed that ‘Britewellt’ had stronger tolerance to both drought and waterlogging than ‘Legacy’.