Plants & Human Affairs (BIOL106) - Stephen G. Saupe, Ph.D.; Biology Department, College of St. Benedict/St. John's University, Collegeville, MN 56321; ssaupe@csbsju.edu; http://www.employees.csbsju.edu/ssaupe |
II. Roots as foods
III. Stems as food
Botanically, a stem is the structure to which the leaves and roots are
attached. The stem supports the plant and is characterized by having buds and leaves. We
typically think of stems as growing above the ground, but as we discussed earlier, some
specialized types of stems (i.e., tubers, rhizome, corm, bulb) grow underground.
IV. Leaves as food
Recall that leaves are the photosynthetic part of the plant and are
typically comprised of a blade and stalk (petiole). Crops can be derived from the leaf
blade ("greens") or petiole
V. Meristems as food cabbage, Brussels sprouts, head lettuce
VI. The Mustard Family (Cruciferae or Brassicaceae) - an important family of veggies (not on exam)
VII. Fruits as food.
A. What is a fruit?
B. Fruit History.
From the dawn of humanity, fruits have been used to supplement our
diet. They were particularly important in hunter-gatherer societies, even after the switch
to an agrarian lifestyle. Fruit remnants are found in most archaeological digs. Fruits
even spurred colonization (think Columbus among other things he was searching for
black pepper, a spice from the fruit of the plant ).
VIII. Fruits vs. veggies.
Botanically, fruits come from the ovary or "reproductive"
parts of the plant and a vegetable comes from "vegetative" parts, such as
leaves, roots and stems. Simple, right? So, is a zucchini a fruit or vegetable? How about
cauliflower? or tomato? or squash? Many foods that we consider vegetables are actually
fruits, and vice versa. The problem arises because "fruit" is commonly used to
describe a food that is usually sweet and eaten as dessert or perhaps salad, whereas
vegetable is used to describe a food, usually green, that is eaten during the main course
of a meal.
IX. Seeds vs. Fruits.
These terms are often incorrectly applied (from a strict botanical
sense) by the non-botanist. Remember that fruits come from the ovary and seeds come from
the ovule. Thus, the seeds are inside the fruits. However, there are a few fruits and
seeds that cause some confusion. For example, sunflower seeds and corn grains are actually
fruits. When you shell a sunflower seed you remove the pericarp and eat the seed. Thus,
sunflower "seeds" are examples of an achene a type of single-seeded fruit
that is dry and indehiscent. Similarly, corn grains are a special type of single-seeded
fruit in which the seed is completely fused to the pericarp so that you can't tell where
one ends and the other begins.
Conversely, seeds like coconut, are often considered to be a fruit. The coconut is produced inside a hard, fibrous husk which is the fruit.
Take-home-lesson: fruits have seeds, vegetables do not...the seeds are inside the fruit.
Questions:
Table 1. Supermarket Botany | ||
Crop | Native region | Part eaten/used |
Artichoke* | Mediterranean | Leaves associated with the flowers, receptacle |
Asparagus* | Mediterranean | Young shoot |
Avocado* | Mexico | Fruit |
Bamboo* | Asia | Shoots |
Banana* | SE Asia | Fruit |
Beet | Mediterranean | Root (red pigment, betalain, not readily digested) |
Blueberry* | North America | Fruit |
Bok-Choi | Asia | Leaves; this plant is a variety of Fast Plant |
Brazil Nut* | South America | Seed the actual fruit is a large hard pod |
Broad Bean (Fava Bean) | Near East | Seeds |
Broccoli* | Europe | Immature flower buds and stems |
Brussels Sprouts* | Europe | Lateral buds (meristems) |
Carambola (Star-Fruit) | Asia | Fruit |
Carob | Mediterranean | Fruit, used as a chocolate substitute |
Carrot* | Mediterranean | Root |
Cashew | South America | Seed from a relative of poison ivy |
Cauliflower* | Europe | Immature flower buds and stems |
Chick-Pea (Garbanzo) | Near east | Seeds of legume |
Coconut* | pan-tropical | Seed of a palm |
Cranberry* | North America | Fruit |
Cucumber* | Asia | Fruit |
Eggplant* | Asia | Fruit |
Fig* | Mediterranean | Fruit pollinated by wasp, multiple fruit with flowers lining a hollow chamber |
Garlic* | Mediterranean | Bulb; vegetable |
Grapefruit* | West Indies (hybrid) | Fruit |
Grapes (Wine)* | Mediterranean | Fruit, many native species, but our wine grapes are from Europe |
Guava | South America | Fruit, beautiful pink flesh |
Kohlrabi* | Mediterranean | Veggie, hypocotyl swells to form edible structure, like an above ground radish |
Leek* | Near East | Veggie, bulb |
Lemon* | Asia | Fruit |
Lentil | Near east | Seeds of a legume |
Lettuce* | Eurasia | Veggie, head lettuce is essentially a meristem |
Macadamia Nut | Australia | Seed |
Maize (Corn) | Central America | Fruit |
Mango | Asia | Fruit (relative of poison ivy) |
Manioc (Cassava)* | South America | Veggie, root, loaded with HCN, must be detoxified before eating |
Melon (Cantaloupe, Honeydew)* | Africa | Fruits grain |
Millet | Africa | Fruits grain |
Oats | Europe | Fruits grain |
Okra | Asia | Fruit, very mucilaginous |
Olives* | Mediterranean | Fruit |
Orange* | Asia | Fruit; naval oranges are "mutants" propagated asexually from cuttings |
Papaya | Central America | Fruit |
Parsnip | Mediterranean | Veggie, root, like a white radish |
Pea* | Near East | Seeds of legume fruit |
Peanut* | South America | Seeds of legume fruit |
Pecans | Mexico, SW America | Seeds |
Pepper* | South America | Fruit |
Pineapple* | South America | Fruit, multiple fruit |
Pomegranate* | Mediterranean | Red fleshy covering surrounding seeds |
Potato White* | South America | Veggie, stem (tuber) |
Radish* | W. Asia | Veggie, root or stem (hypocotyl) |
Rhubarb* | Europe | Veggie, leaf stalk (petiole) |
Rutabaga | Europe | Veggie, root |
Sorghum | Africa | Fruit - grain |
Soybean | China | Seeds of a legume |
Spinach* | Asia | Veggie, leaf |
Squash* | South America | Fruit |
Strawberry* | South America | Aggregate fruit |
Sunflower* | North America | Fruit |
Tomatillo | South America | Fruit |
Tomato* | South America | Fruit |
Turnip | Eurasia | Veggie, root |
Walnuts (English)* | Eurasia | Seed, native walnuts have good flavor but hard to shell |
Watermelon* | Africa | Fruit |
Wheat | Near East | Fruit grain |
Zucchini* | Mexico | Fruit |
Table 2. Comparison of nutrient content of various vegetables (data from Simpson & Ogorzaly, 1995) | |||||
Average | Leafy crops (cabbage, cauliflower, chard, celery, endive, kale, kohlrabi, lettuce, spinach | Stem crops (artichokes, asparagus) | Bulbs (leeks, onion) | Biennial Roots crops (beets, carrot, parsnip, radish, turnip, rutabaga) | Starchy tubers & rhizomes (manioc, white potato, sweet potato, yam) |
Water content (%) | 90.7 |
89 |
86.5 |
87.8 |
62.2 |
Calories | 27.6 |
23 |
48.5 |
30.6 |
148.2 |
Carbohydrates (%) | 5.3 |
8 |
11 |
10 |
35.2 |
Vitamin A (units) | 3148 |
530 |
20 |
1940 |
1764 |
Vitamin C (mg/100g) | 56.2 |
22.5 |
21 |
23.1 |
10.8 |
Table 3. Comparison of fruits and nuts (per 100 grams) | ||
Characteristic | Fruit |
Nut |
Water content | 84.3 |
5.2 |
Calories | 59.6 |
559.6 |
Protein | 0.82 |
12.0 |
Fat | 1.25 |
52.2 |
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