干旱条件下不同汉麻品种光合荧光特性比较分析

Comparative Analysis of Photosynthetic Fluorescence Characteristics of Different Hemp Varieties under Drought Conditions

为了研究干旱胁迫对不同品种汉麻光合特性的影响,本文以6个品种汉麻为研究对象,在苗期设置3个水分处理,分别以土壤相对含水量80.0%、50.0%和20.0%为对照、轻度干旱和重度干旱,测定不同程度干旱胁迫下6个品种汉麻植株的株高和根长,以及汉麻叶片的光合色素(叶绿素a、叶绿素b、类胡萝卜素和总叶绿素)含量、光合参数[净光合速率(P_(n))、气孔导度(G_(s))、胞间CO_(2)浓度(C_(i))、蒸腾速率(T_(r))]、荧光动力学参数[初始荧光(F_(0))、最大荧光(F_(m))、最大光化学效率(F_(v)/F_(m))、实际光化学效率(F_(v)'/F_(m)')、实际光化学量子效率(Φ_(psⅡ))、光化学淬灭系数(qP)、电子传递效率(ETR)]和水分利用效率(Ew)。结果表明:随干旱胁迫程度的增加,6个品种汉麻的株高呈显著降低趋势,根长呈显著上升趋势,光合色素呈显著下降趋势,初始荧光多数呈现先下降后上升趋势,最大荧光多数呈显著降低趋势,最大光化学效率部分呈先上升后降低趋势,实际光化学量子效率部分降低,光化学淬灭系数多数上升。综合6个品种汉麻光合荧光指标受干旱的影响情况,对干旱胁迫适应性较强的品种为Y3和Y4。

In order to investigate the impact of the drought stress on the photosynthetic fluorescence characteristics of different hemp varieties,six varieties of hemp were used as the research objects,and three moisture treatments were implemented during in the seedling stage,which were regarded as the control,mild drought and severe drought with 80.0%,50.0%and 20.0%of relative soil moisture content,respectively.The contents of photosynthesis (chlorophyll a,chlorophyll b,carotenoids and total chlorophylls) of the six varieties of nattic leaf under different degrees of drought coercion,(net photosynthetic rate (P_(n)),porosity guidance (G_(s)),inter-cytoplasm CO_(2) concentration (C_(i)),steam rate (T_(r)) and fluorescent dynamics parameters ((initial fluorescent (F_(0)),maximum fluorescent (F_(m)),maximum optical chemical efficiency (F_(v)/F_(m)),actual photochemical efficiency (F_(v)′/F_(m)′),actual optical quantum efficiency(Φ_(psⅡ)),optical chemical quenching coefficient (qP),electronic transfer efficiency (ETR)),and moisture utilization efficiency (E_(w)) were measured.The results show that,with the increase of drought stress,the six varieties of hemp plant height significantly decreased,the root length is significantly rising,photosynthetic pigment is significantly decreasing,the initial fluorescence mostly showed a trend of first decreasing and then increasing,the maximum fluorescence mostly showed a significant decreasing trend,the maximum photochemical efficiency partially showed a trend of first increasing and then decreasing,the actual photochemical quantum efficiency most lower,the photochemical quenching coefficient most rise.Based on the influence of drought,Y3 and Y4 were more adaptable to drought stress.