【甜瓜果实糖分积累与蔗糖代谢相关□变化规律的基因型差异研究】.pdf

部较其它部位更早的积累蔗糖,证明甜瓜各个部位积累蔗糖的速度是不一样的,这可能是由于各个部位存在不同的蔗糖代谢酶变化所造成.果实发育前期,蔗糖分解酶类的活性明显大于蔗糖合成酶类,蔗糖代谢相关酶的净活性为较高的负值,因此光合产物进入果实后大多被分解、利用和消耗,蔗糖的积累较缓慢。果实发育后期,蔗糖代谢相关酶分解酶类活性降至很低,合成酶类活性升高,故果实中蔗糖的含量迅速增加。本实验的结果表明:净活性为负值时,没有或只有少量蔗糖积累:净活性为正值后,数值越大蔗糖积累越多.SPS活性升高较“娜依托”早,且在后期活性高于“娜依托”。

Abstract China is the largest country of sweet melon(Cucumis melo L.fruit production that accounted for more thanpercent of total growing acreage and yield in the world.However,the poor quality of sweet melon fruits give rise to a great reduction intheeconomicbenefit.

osmotic pressure in cell and ensure sufficient water imbibition.Areduction in invertase activity,especiallyacidinvertase,wouldbeaprerequisiteforsucrose accumulationatfruitmaturity.Sucrose synthase could catalyze sucrose.