Sucrose Metabolism in Netted Muskmelon Fruit during Development.

نویسندگان

  • S E Lingle
  • J R Dunlap
چکیده

Sugar content and composition are major criteria used in judging the quality of netted muskmelon (Cucumis melo L. var reticulatus) fruit. Sugar composition and four enzymes of sucrose metabolism were determined in ;Magnum 45' muskmelon fruit at 10-day intervals beginning 10 days after pollination (DAP) until full-slip (35 DAP). Sugar content increased in both outer (green) mesocarp and inner (orange) mesocarp between 20 and 30 DAP. The major proportion of total increase in sugar was attributed to sucrose accumulation. The large increase in sucrose relative to glucose and fructose was accompanied by a dramatic decrease in acid invertase activity, which was highest in both tissues at 10 and 20 DAP, and increases in sucrose phosphate synthase (SPS) and sucrose synthase activities. The green tissue had a lower proportion of total sugar as sucrose, greater invertase activity, and less SPS activity than the orange tissue. Changes in relative sucrose content were highly correlated with changes in enzyme activity. The results strongly suggest that increases in the proportion of sucrose found in melon fruit were associated with a decline in acid invertase activity and an increase in SPS activity approximately 10 days before full-slip. Therefore, these enzymes apparently play a key role in determining sugar composition and the quality of muskmelon fruit.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Sucrose Phosphate Synthase and Acid Invertase as Determinants of Sucrose Concentration in Developing Muskmelon (Cucumis melo L.) Fruits.

Fruits of orange-fleshed and green-fleshed muskmelon (Cucumis melo L.) were harvested at different times throughout development to evaluate changes in metabolism which lead to sucrose accumulation, and to determine the basis of differences in fruit sucrose accumulation among genotypes. Concentrations of sucrose, raffinose saccharides, hexoses and starch, as well as activities of the sucrose met...

متن کامل

Grafting Helps Improve Photosynthesis and Carbohydrate Metabolism in Leaves of Muskmelon

The most important quality for muskmelon (Cucumis melo L.) is their sweetness which is closely related to the soluble sugars content. Leaves are the main photosynthetic organs in plants and thus the source of sugar accumulation in fruits since sugars are translocated from leaves to fruits. The effects of grafting muskmelon on two different inter-specific (Cucurbita maxima×C. moschata) rootstock...

متن کامل

Guide to the Commercial Production of Muskmelon (Cantaloupe) and Related Melons

Historical Perspective Muskmelons, often called cantaloupes in the United States, are not commonly grown here. True cantaloupes have deeply grooved fruit with a hard, warty, or scaly rind and orange or green flesh. Muskmelons (Cucumis melo L. Reticulatus Group), on the other hand, possess a fruit rind that is netted. The muskmelon is a member of the Cucurbitaceae (cucumber) family, which also i...

متن کامل

Comparisons between Orange- and Green- fleshed Non-netted and Orange-fleshed Netted Muskmelons: Antioxidant Changes following Different Harvest and Storage Periods

The consumption of netted muskmelons (Cucunt.is izzelo L. Reticulatus group) has raised health concerns due to pathogenic bacteria attaching to sites on the netted rind inaccessible to sanitation. The purpose of this study was to compare I) the enzymic and nonenzymic antioxidant capacity between representative cultivars of netted muskmelon and both greenand orange-fleshed honey dew muskmelons d...

متن کامل

Volatile Precursors and Aroma-Related Enzyme Activities during Fruit Maturation of Muskmelon

Fatty acids and amino acids serve as ester precursors, in addition to lipoxyaenase (LOX; EC 1.13.11.12), alcohol dehydrogenase (ADH; EC 1.1.1.1) and alcohol o-acyltransferase (AAT; EC 2.3.1.84) activities, were assessed during maturation of climacteric and nonclimacteric muskmelons. The results showed that the levels of the main fatty acids related to aroma formation containing oleic acid, lino...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:
  • Plant physiology

دوره 84 2  شماره 

صفحات  -

تاریخ انتشار 1987