Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/20887
標題: 積儲強度對溫室洋香瓜葉片光合成率與蔗糖代謝之影響
Effects of sink strength on photosynthetic rate and sucrose metabolism of the muskmelon leaves(Cucumis melo L.)
作者: 連慧瑞
Lian, Huey-Ruey
關鍵字: muskmelon;洋香瓜;sink strength;source;sink;sucrose metabolism;積儲強度;供源;積儲;蔗糖代謝
出版社: 植物學系
摘要: 
以溫室洋香瓜(Auska品種)於開花授粉期,施以摘果處理及不同留果數處
理(留果1顆及留果2顆),藉以改變供源(葉片)與積儲(果實)之比率
,探討對植株葉片光合成率及蔗糖代謝之影響。所得結果得知:兩種留果
處理株之光合成率、及氣孔導度均較不留果株高。蔗糖及澱粉含量有累積
現象,蔗糖合成酵素活性則隨授粉天數增加而增加,但與不留果株之差異
不明顯。留果株之光合成率、Rubisco活性、蔗糖磷酸合成酵素活性、及
葉綠素含量均隨授粉天數增加而下降,但不同留果株間差異並不明顯。此
外留果2顆株果實總重量高於留果1顆株,為果實糖度明顯低於留果1顆株
。不留果株之光合成率及氣孔導度之下降幅度較兩種留果株低,且
Rubisco活性、蔗糖合成酵素活性、澱粉含量及葉綠素含量變化不大,而
蔗糖含量及蔗糖磷酸合成酵素活性與兩種留果株之差異均不明顯。唯葉面
積及植株各部位乾重均高於留果株,顯示光合產物有重新分配之現象。本
研究尚獲知,光合成率與氣孔導度呈顯著正相關,與澱粉含量呈負相關,
但與Rubisco活性間並無相關性,而同化產物之分配與葉片之蔗糖磷酸合
成酵素活性及蔗糖含量亦無直接相關。

To change the ratio of the source(leaf) and sink(fruit),
muskmelon in greenhouse were taken non-fruiting(Fu0), one fruit
remained(Fu1), and two fruit remained(Fu2) treatments during the
pollination stage. The influences of photosynthetic rate and
sucrose metabolism were investigated in terms of above
treatments. The study results were stated below.The results
showed that photosynthetic rate and stomatal conductance of Fu1
and Fu2 were higher than Fu0 and the contents of sucrose and
starch were accumulated. The activity of sucrose synthase was
increased during the fruiting stage. However, the photosynthetic
rate、Rubisco activity、sucrose phosphate synthase activity、
starch content、and chlorophyll content were decreased during
the fruiting stage. There were no significant difference between
Fu1 and Fu2. The total fruit weight of Fu2 was higher than that
of Fu1 during the fruiting stage. However, fruit sweetness was
lower than that of Fu1.The photosynthetic rate and stomatal
conductance of Fu0 were slightly decreased after taking non-
fruit treatment than those of Fu1 and Fu2. The activities of
Rubisco and sucrose synthase and contents of starch and
chlorophyll were not different after taking non-fruiting
treatment. The content of sucrose and activities of sucrose
phosphate synthase were not significantly different among Fu0、
Fu1 and Fu2.The results also found that photosynthetic rate was
positively correlated with stomatal conductance and negatively
correlated with starch content, however, it was not correlated
with Rubisco activity. The export of assimilates was not
correlated with the activity of sucrose phosphate synthase and
the content of sucrose.
URI: http://hdl.handle.net/11455/20887
Appears in Collections:生命科學系所

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