Maize and Its Importance

Maize Overview

Origin of Maize

  • Q3: Where did maize originate from?
    • Maize originated from the New World, specifically Mesoamerica (Mexico/Central America).

Maize's Wild Ancestor

  • Q4: What is the name of maize's wild relative (ancestor)?
    • Maize's wild ancestor is teosinte, classified as Zea mays ssp. parviglumis.

Improved Traits of Cultivated Maize

  • Q5: What four traits did teosinte have that were improved in cultivated maize? How did they change? What advantage do these traits have for humans?
    1. Ear Size & Kernel Number
    • Teosinte: Tiny ears with few kernels.
    • Cultivated Maize: Large ears with many kernels.
    • Advantage: Increased food yield per plant.
    1. Seed Casing
    • Teosinte: Kernels enclosed in a hard casing.
    • Cultivated Maize: "Naked" exposed kernels.
    • Advantage: Easier to eat and process.
    1. Shattering
    • Teosinte: Naturally shatters to disperse seeds.
    • Cultivated Maize: Non-shattering ears.
    • Advantage: Kernels stay on the cob, making the harvest easier.
    1. Branching/Architecture
    • Teosinte: Highly branched plant.
    • Cultivated Maize: Single tall stalk with big main ear(s).
    • Advantage: Easier to grow and harvest.

Nixtamalization Process

  • Q6: How is corn processed to make nixtamal?
    • Dried maize kernels are cooked and soaked in an alkaline solution, typically water combined with lime (calcium hydroxide).
    • After soaking, the kernels are washed and ground.
    • This process is referred to as nixtamalization.

Carbohydrate Sources

  • Q7: Maize was a major carbohydrate source in the New World. What is a carbohydrate? What are the other major carbohydrate sources in the New World?
    • Definition of Carbohydrate:
    • A carbohydrate is a molecule primarily composed of carbon (C), hydrogen (H), and oxygen (O), exemplified by substances such as starch and sugars.
    • Carbohydrates are primarily used as a source of energy.
    • Other Major Carbohydrate Sources in the New World:
    • Potatoes
    • Sweet Potatoes
    • Cassava
    • Beans
    • Other grains

Botanical Classification of Grains

  • Q8: Botanically speaking, what is the name of fruits of the Poaceae?
    • The Poaceae family, which includes grasses like rice, wheat, and maize, produces fruits known as caryopses, which are commonly referred to as grains.