【摘要】 番木瓜叶子罹致花斑叶病,其分离叶绿体的二阶导数吸收光谱的较长波长吸收峰687、698、702毫微米和叶绿素b 的85毫微米吸收峰显著消减。表明花斑叶病的侵染引起叶绿素库色素成分的变化。在相同的叶绿素含量基础上,罹病叶子所分离叶绿体的光系统Ⅱ荧光发射强度较健康叶子的低10.6%。花斑叶病的侵染降低叶绿素所吸收光的激发能的传递和利用效率。罹病叶子的光合速率为8.96微克分子·米^-2·秒^-1,仅相当于健康叶子的56.2%;叶子的CO₂传导率为健康叶子的39.5%;细胞间的CO₂浓度较健康叶子低15%。罹病叶子的蒸腾作用的速率和水分传导率较健康叶子的低。叶子罹致花斑叶病引起叶子物理特性的变化。更多还原

【Abstract】 At room temperature the shrinkages of 4 bands at 656,687,698 and702 nm were found in the second derivatives spectra of chlorophyll iso-lated from papaya leaves infected with mosaic virus.It showed that thechanges of the components of chlorophyll pool occurred.As compared with the healthy leaves,on the same chlorophyll con-tent basis,the decrease of fluorescence density of photosystem Ⅱ of chlo-roplasts isolated from the infected leaves was found.It means that thedecrease of the energy transport efficiency occurred when papaya leaveswere infected with the virus.The rate of photosynthesis of infected lea-ves in the field was 8.96 mole CO₂/m²/s,as much 51.2% lower than thatof the healthy leaves.The stomatal conductance to CO₂ and the interce-llular CO₂ concentration were lower than that of healthy leaves 60.5%and 15%,respectively.As compared with that of healthy leaves,lowerrate of transpiration and stomatal conductance to water vapor were foundin infected leaves.The change of some characteristics of leaf relatingto CO₂ and water exchange or photosynthesis and tranpiration occurredin infected leaves.更多还原