ABSTRACT

Arabidopsis thaliana FLL2, a member of the FLO2 gene family, is expressed specifically in green leaves. The fll2 mutant showed significantly large rosette leaves and reduced the chlorophyll content. The sucrose content was significantly reduced. The glucose content was higher during the vegetative growth stage but decreased during the early reproductive growth stage. The amount of assimilated starch was lower than that in the wild type plant. The expression levels of genes involved in biosynthesis of sucrose and starch were largely altered. These results suggest that, in the fll2 mutant, a small amount of photosynthetic products was used for the biosynthesis of starch, and the products were supplied to promote intracellular growth of the source organs or for transport to the sink organs. These findings suggest that FLL2 is a factor affecting the expression level of genes involved in sugar metabolism, whose mutation caused a change in the assimilated products.

Abbreviations : DAS: days after sowing

摘要

拟南芥FLL2的成员FLO2基因家族，是专门在绿叶中表达。该fll2突变表现出显著大莲座叶，降低叶绿素含量。蔗糖含量显着降低。在营养生长阶段，葡萄糖含量较高，但在早期生殖生长阶段，葡萄糖含量下降。淀粉的同化量低于野生型植物。参与蔗糖和淀粉生物合成的基因的表达水平已大大改变。这些结果表明，在fll2突变体中，少量的光合产物用于淀粉的生物合成，并且提供这些产物以促进源器官的细胞内生长或运输至汇聚器官。这些发现表明，FLL2是影响糖代谢相关基因表达水平的一个因素，其突变导致同化产物发生变化。

缩写：DAS：播种后几天