cereal poaceae. cereals genetically – originated from asia, central and south america and africa....
TRANSCRIPT
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Cereal
Poaceae
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Cereals
• Genetically – originated from Asia, Central and South America and Africa.
Good crop:– Palatibility– Quantity satisfaction– Nutritional value– Digestibity– Toxic property– Seasonal availabilty– Storage life– Preparation requirement– presentation
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Cereals
• Named after Ceres, the Roman Goddess of agriculture
• Poaceae members• Grain is a fruit – caryopsis• 70% of Earth’s farmland – feeding humans and
animals• Three major categories
– Major cereal– Minor cereal– Wild cereal
• Pseudocereal – non-poaceae members
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Cereals
• 30,000 yrs ago paleolithic people collected seeds. Still followed by aborigines of Australia
• Delta of Nile and fertile Cresent – 8000 -7000 BC
• Wide spread in Mediterranean basin, Western Asia and Western Europe – 4000 yrs
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Vegetative
• Vegetatively, grasses have several features. – The stems are round in cross section, the
internodes are hollow, the nodes are solid, – the leaves are flat and 2-ranked, – the bases of the leaves have an open sheath
that encircles the stem, and t– here is often a ligule present at the juncture of
the sheath and the leaf blade.
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Inflorescence
• The inflorescences of grasses also have distinctive characteristics. – The basic unit of an inflorescence is a
spikelet, which contains 1 or more flowers. – At the base of the spikelet are 2 bracts called
glumes. – The spikelets can be arranged in panicles,
racemes, spikes, or other types.
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Poaceae
• The flowers of Poaceae are small, lack petals, and are pollinated by wind. The 2 sepals are modified into lodicules. There are 3 stamens that hang down and the anthers shed pollen into the wind. The syncarpous gynoecium has 2 carpels, the ovary is superior, the styles are feather-like to catch pollen from the wind, and the ovary is 1-locular with 1 basal ovule.
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Poaceae (The grass family)
• Caryopsis - A one-seeded dry indehiscent fruit (achene) with the thin pericarp adherent to the seed.
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