- May 23, 2018 -
Corn is a common food crop, neither fruit nor vegetable.
Food crops include wheat, rice, corn, oats, rye, barley, millet, sorghum and barley.
Corn, commonly known as bonzi, jade, corn, and corn, is native to Mexico and Peru in Latin America along the foothills of the andes. After Columbus discovered America, he brought corn to Spain in his second return (1499). With the development of the world's shipping industry, corn gradually spread to all parts of the world and became one of the most important food crops.
Corn which enjoys a good longevity food, rich in protein, fat, vitamins, trace elements, cellulose and polysaccharide etc., has developed the great potential of high nutrition, biology functional food.
Corn is not only the main source of human food, it has become a popular health food, which often appears on the table, and is popular in the European and American world, which is famous for its fine food. According to the newspaper, former US President Ronald Reagan used to eat corn porridge for breakfast every morning.
1. Morphological features
1) tall herbs annual. Stem erect, usually unbranched, 1-4 m high, base of each section with air - bearing support roots.
2) leaf sheaths with transverse veins; Leaf tongue membranous, ca. 2 mm long; Leaf blade flat and broad, linear lanceolate, base rounded auricle, glabrous or blemished, medium veins stout, margin slightly coarse.
3) large conical inflorescences of the apex male, the main axis and the racemose axis and their axils are all pubescent; Male spikelet twins, up to 1 cm long, petiole short, 1-2 mm and 2-4 mm long, pubescent; Two glumes near equal length, membranous, about 10 veins, cilia; Lemma and lemma transparent membranous, slightly shorter than glume; Anthers orange; It's about 5 millimeters long.
4) the female inflorescence is covered by most broad scabbard bracts; The female spikelets are twinned, forming 16-30 longitudinal rows in the bold sequence axis. The two glumes are long, broad, without veins, and with cilia; Lemma and lemma transparent membranous, pistil having extremely long and slender linear style. The size varies with the growth conditions, usually 5-10 mm long and slightly too long. The embryo is 1/2 to 2/3 of the carina.
5) chromosome 2n= 20,40,80 (Sarma et Sharma, 1986; Molina, 1986.
2. Distribution range
Corn is native to central and South America. It is now cultivated all over the world. Main distribution between 30 ° - 50 ° latitude. The most cultivated areas are the United States, China, Brazil, Mexico, South Africa, India and Romania. The main corn producing areas in China are northeast, north and southwest.