Please use this identifier to cite or link to this item:
Effects of Benzyladenine on te Carbon Metaboism and Tissue Anatomy of Muskmelon (Cucumis meo L.) Leaves
高溫室洋香瓜的品質。利用30 ppm BA於授粉後7天處理植株，實驗結果顯
降低了果實之重量。因此，於受粉7天以30 ppm BA處理植株，並無法改善
During the development period of muskmelon, the photo-synthetic rate of the upper leaves decreased apparently. The export of photoassimilates in upper leaves was reduced and un-able transported to the fruit sufficiently, and resulted in the slow growth rate of fruit. Our purpose here is to improve the photo- synthetic rate in order to increase the content of sucrose in leaves, to supply sufficient carbon, and to refine the quality of muskmelon.We used 30 ppm of benzyladenine (BA) to treat the plant that is 7-day after anthesis. The result indicates that both leaf area and biomass of the BA-treated plants are much higher more then the control. Referred to the tissue anatomy, the leaf thickness of the BA-treated plants increases obviously. This is because that BA can promote leaf cells to absorb more water, and as a result, to enlarge the cells. Besides, the number of the chloroplast also increases suggesting an improved photosyn-thetic rate.As for carbon metabolism, the sucrose phosphate synthase (SPS) activity of the BA-treated plant is higher than that of the control. The activity approaches to the maximum on the 15th day after BA-treated, but gradually diminishes until fruit gath-ering indicating that the rate of sucrose synthesis decreases. However, the content of sucrose in the BA-treated leaves in-crease evidently. Our result suggests that sucrose is accumu-lated in the leaves and fails to transport to the fruits. So, the quality of the fruit reduces. As to the aspect of sucrose degra-dation, the activity of the neutral invertase in the BA-treated plant increase and the content of hexose increase consequently. The increased concentration of hexose can provide sufficient carbon source for the leaves to grow.Our conclusion is that plants treated with BA can avoid leaves from senescence. Is can also increase photosynthetic rate of the leaves, and furthermore, promote sucrose accumula-tion in leaves. But it cannot provide abundant sucrose for de-veloping fruit. And the weight of the fruit decreases conse-quently. So, if we treated the plant with 30 ppm of BA 7-days after anthesis, we still cannot refine the quality of fruit. Whether it is a question of the inadequate treating period is still a doubt and needs further research.
|Appears in Collections:||生命科學系所|
Show full item record
TAIR Related Article
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.