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Indigenous to the Americas Principle food grain of Americans Domesticated about 8000 years ago Yield is 700 million tons per year.
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IN THE NAME OF ALLAH THE MOST MERCIFULL
AND MOST BENEFICIENT
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UNIVERSITY COLLEGE OF AGRICULTURE
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A Presentation By
Ishtiaq Shariq
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Roll #: 2
B. Sc. (Hons.) 6th Semester Plant Breeding and Genetics
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ORIGIN
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• Indigenous to the Americas • Principle food grain of Americans • Domesticated about 8000 years ago
• Building on this legacy, early
American farmers evolved
high-yielding, open-pollinated
dent cultivars adapted to.......
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Native Americans accomplished remarkable feats by evolving races of flint, flour, gourd-seed dent, pop, and sweet corn.
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• Differ from primitive corn in having more
productive plants due to an increased
number and weight of individual kernels
on a cob of corn.
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Teosinte
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A POINT IN DISCUSSION
Whether corn originated by a single domestication from the basal branching
teosinte subspecies Zea mays L. spp. parviglumis
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OR
From the lateral branching subspecies Z. mays L. spp. mexicana, or by a dual
domestication from the two subspecies.
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• Proposed pathways for double origin of corn from different subspecies of teosinte.
• Upper: Basal branching type from subspecies parviglumis. Note proliferation of tillers at the base of the plant.
• Lower: Lateral branching type from subspecies mexicana.
• Note that branching is lateral, with each branch terminating in a tassel.
Teosinte
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Native to
The wild annual forms of teosinte have the same chromosome
number as corn
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Teosinte X corn = fertile
corn and teosinte
• Teosinte, like corn, is monoecious in flowering habit, with staminate and pistillate flowers borne in separate inflorescences
• Differs from corn in that the pistillate spikes bear 6 to 12 kernels in hard triangular, shelllike structures. The teosinte seed structures break apart and shatter when mature, forming a natural means of seed dispersal
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CORN HAS TWO POSSIBLE CENTERS OF ORIGIN
• The highlands of Peru, Ecuador, and Bolivia; and the region of southern Mexico and Central America.
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ECONOMY
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MILLING
Wet Milling
Dry Milling
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WET MILLING PRODUCTS
• Modified maize starch for paper lamination
• Textile
• Wrap
• Sizing and laundry finishing
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• Animal feed
• Brewing
• Breakfast cereals
• Other food.
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• In India, dry milling is the predominant process for:
• Flour
• Animal feed
• Fermentation
• Distilling industries
• Composite flours.
• In the new millennium, it is an alternate crop to rice and wheat
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WORLD PRODUCTION
• 700 million tonnes, one-third of world cereal output.
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• Over the past two decades, global maize production has increased by
nearly 50 percent, or 1.8 percent annual compound growth rate.
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Most of the increase in world maize production during the past decade can
be attributed to a rapid expansion
IN
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ASIA • 35 percent during the past decade • Accounting for 30 % of global growth
CHINA CONTRIBUTION IN ASIA
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60 PERCENT
Highlights of the Pakistan Economic Survey 2011-12
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13%
7%
13%
56%
18%
0%
10%
20%
30%
40%
50%
60%
CONSUMPTION
CONSUMPTION
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SOURCES
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Applications: Field Crops Utilizing Hybrid Breeding Procedures Chapter 17 Origin of Corn, page 321
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Economic Section Competitive Commercial Agriculture in Sub–Saharan Africa (CCAA) Study Maize International Market Profile
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