银杏叶片发育过程中叶绿素快相荧光动力学的特征研究

Characteristics of Fast Chlorophyll Fluorescence of Ginkgo biloba Leaves During Their Development Process

银杏叶片的生长呈明显的"S"形曲线,4月底叶面积达到最大;新生叶刚展开时就已经合成了大量叶绿素,且随着叶片的成熟,叶绿素含量逐渐增大,并在4月下旬达到相对稳定的最大值;银杏叶片的PSII最大光化学效率(Fv/Fm)、光能吸收和传递效率(ABS/CSo、TRo/CSo、ETo/CSo)、质体醌库大小(Sm)和反应中心数目(RC/CSo)等也在4月下旬逐步趋于稳定,说明叶片光合功能的在4月底已发育完善;荧光参数中性能指数PI在叶片成熟过程中变化最为灵敏,可以作为量化叶片成熟过程中光合能力的指标。

The growth curve of Ginkgo biloba leaf was the obvious ＂S＂ shapes during the April, and leaf area reached the maximum size at the end of April. Chlorophyll contents had smaller change amplitude compared with leaf area. Chlorophyll content in Ginkgo biloba leaf tended to increase with the extend of maturity time, and reached the relatively stable maximum content in the last third of April. The photosynthetic results of Ginkgo biloba leaf determined by handy plant efficiency analyser showed that maximal efficiency of PSII photochemistry （ Fv/Fm）, the efficiency of light absorption and transport （ABS/CSo, TRo/CSo, ETo/CSo）, the size of plastoquinone and the number of reaction centres were all tending towards stability, which indicated that the photosynthetic function of Ginkgo biloba leaf already developed fully at the end of April. Performance index of plants （PI） was the most sensitive parameter among all the fluorescence parameters, which can be used to quantize photosynthetic function of leaf during the development process.