要的！现代水果（即使买来籽/苗自己种）与“纯天然”野生水果比，富含糖份而少纤维素。

来源: 恶俗老狼于 2016-10-16 05:04:16 [档案] [博客] [旧帖] [给我悄悄话] 本文已被阅读：次 (12904 bytes)

回答: 吃个水果也用不着去东非吧由羽衣甘蓝于 2016-10-16 01:53:54

This series of tables provides a partial answer to the
question, "How natural is modern, cultivated fruit?"
by comparing it to wild/natural fruit.

Plant Breeding & Propagation

Wild / Natural Fruit	Modern / Cultivated Fruit
Evolutionary varietal selection driven by species survival.	Human-directed varietal selection for taste (high sugar content: market acceptance) and production factors such as ability to withstand shipping.
Usually non-hybrid; on occasion natural hybrid.	Artificial hybrids common; genetic engineering is latest fashion.
Propagation usually by seeds (not necessarily true to seed), or natural vegetative propagation/root divisions/slips (banana, pineapple).	Vegetative propagation, usually artificial: grafting, budding, air-layer, cloning.
Grows on its own roots.	Usually grafted to an alternate rootstock.

Plant Culture

Wild / Natural Fruit	Modern / Cultivated Fruit
Grown in natural "permaculture."	Mass-produced in orchards, a type of "monoculture."
Generally watered by rainfall only, according to natural seasonal cycle.	Often grown on irrigated land (desert areas like California), or drained swampland (e.g., Florida).
Grows within specific climatic zone, per natural adaptation/habitat.	May be grown in greenhouse, or artificial plant breeding techniques may be used to extend plant climate tolerance range (i.e., increase cold/heat resistance).
Plants grow to full size, subject to local conditions.	Plants may be artificially dwarfed for ease in picking and other conveniences.
Plants are pollinated by natural means: native insects, wind, birds, bats.	Pollination services which use the honeybee (not native to North America) are often used. Some fruits are hand-pollinated (cherimoya), while Smyrna-type figs are pollinated by Caprifig wasps deliberately raised for that use. Seedless watermelons are a hybrid and require cross-pollination by other varieties of watermelon.
Plants bloom and fruit according to natural conditions and seasons. Some fruits are biennial--heavy crop one year, light crop the next.	Blooming and fruiting may be induced or controlled by chemical or physical means, including partial girdling of large branches. Some growers go to great lengths (harming the plants) to force a biennial fruit to bear heavily each year.
No chemical fertilizers.	May receive chemical fertilizers.
No pesticides, fungicides or other poisons applied.	May receive applications of pesticides, fungicides, etc.--even if so-called organic.

Fruit Characteristics / Quality

Wild / Natural Fruit	Modern / Cultivated Fruit
Small, high in fiber, often sour, bitter, or even astringent; rarely sweet; usually low sugar level.	Large, low in fiber, usually very sweet with a very high sugar level.
Typically, large seeds with small amount of fruit flesh.	Typically, small or no seeds, large amount of fruit flesh. Seedless fruits, in a species that normally reproduces by seeds, are a short-lived anomaly--they are biologically sterile.

Harvest, Post-Harvest Processing, and Shipping

Wild / Natural Fruit	Modern / Cultivated Fruit
Falls to ground or picked when ripe or mature green.	Usually picked unripe or before mature green stage. Ripe/mature green fruit will not withstand the rigors of shipping. Chemicals may be used to promote fruit drop, especially if mechanically harvested.
Never fumigated.	May be fumigated to induce ripening, to kill fruitfly larvae, or to prevent post-harvest fungus growth.
Not treated with hot water, no cold treatment.	May be treated with hot water to kill fruitfly larvae or fungus, cold treatments possible--same reasons.
Not refrigerated, not shipped.	May be refrigerated for weeks or even months (cold-storage apples, controlled-atmosphere storage), usually shipped long distances--shipping and refrigeration cost fossil fuel and create pollution.
Never waxed, colored, or treated with preservative films.	May be waxed, colored, treated with preservative films.

Plant Survival and Reproduction

Wild / Natural Fruit	Modern / Cultivated Fruit
By definition, survives and reproduces in real nature--the wild (survival of the fittest).	Most cultivated fruit strains can survive only under human protection. Cultivated fruit generally cannot survive/reproduce in real nature--the wild. This suggests that cultivated fruit is biologically "weaker" than wild, natural fruit.

Availability to Consumer

Wild / Natural Fruit	Modern / Cultivated Fruit
First you find the plant, then you harvest it. Picking wild fruit may necessitate dealing with any of the following: sharp thorns, caustic plant sap, poisonous plants, stinging and/or biting insects, snakes, skunks, and other animals. Considerable effort usually required to obtain. Wild fruit is sometimes sold at markets in tropical countries.	Easily and readily available at supermarkets, produce markets, and even at convenience stores. Little effort is required to obtain.