Abstract：
:Since sweetness is one of the most important qualities of many fruits, and since sugars are translocated from leaves to fruits, the present study investigates photosynthetic activity, activity of sugar metabolizing enzymes, sugar content in leaves and fruits and endogenous levels of hydrogen peroxide in leaves of melon plants treated with various dilutions of hydrogen peroxide, a nonspecific signaling molecule in abiotic stress. For this purpose, 4-month-old melon plants were treated with various concentrations (<50mM) of hydrogen peroxide by applying 300 mL per day to the soil of potted plants. The treatments resulted in increased fructose, glucose, sucrose and starch in the leaves and fruits. The most effective concentration of hydrogen peroxide was 20mM. During the day, soluble sugars in leaves were highest at 12:00 h and starch at 15:00 h. Furthermore, the peroxide treatment increased the photosynthetic activity and the activities of chloroplastic and cytosolic fructose-1,6-bisphosphatase, sucrose phosphate synthase and invertases. Thus, our data show that exogenous hydrogen peroxide, applied to the soil, can increase the soluble sugar content of melon fruits.
journal_name
J Plant Physioljournal_title
Journal of plant physiologyauthors
Ozaki K,Uchida A,Takabe T,Shinagawa F,Tanaka Y,Takabe T,Hayashi T,Hattori T,Rai AK,Takabe Tdoi
10.1016/j.jplph.2008.08.007subject
Has Abstractpub_date
2009-04-01 00:00:00pages
569-78issue
6eissn
0176-1617issn
1618-1328pii
S0176-1617(08)00256-3journal_volume
166pub_type
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