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Plants and Society Chapter 12
Grains
18
Plant Sciences
Undergraduate 1
02/26/2009

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Term
Grass (poaceae) characteristics
Definition
Herbaceous, linear leaves with parallel venation. Leaves have alternate arrangement. Base of each leaf forms a sheath that wraps around the stem.
Term
culms
Definition
the stems-hollow between the nodes and usually unbranched.
Term
stolons
Definition
aboveground horizontal stems (gives rise to new shoots)
Term
rhizomes
Definition
underground horizontal stems (gives rise to new shoots)
Term
primary root system
Definition
fibrous and adventitious roots
Term
lemma and inner palea (floret)
Definition
two bracts surrounding each flower
Term
spikelet
Definition
one to 12 florets (may be subtended by two bracts called glumes).
Term
awn
Definition
slender bristle extending from either a glume or a lemma (occasionally the palea.)
Term
grains
Definition
typical fruits of the grass family-dry, seeded indehiscent fruits
Term
chaff
Definition
bracts that surround the grain
Term
bran
Definition
the outer wall of the grain consisting of fruit wall fused to the seed coat. lots of fiber
Term
aleurone layer
Definition
interior to the bran-a layer of enlarged cells (high in protein). If seed germinates, it provides the enzymes that break down stored food for the growing of the embryo. Majority of seed occupied by endosperm (contains stored food in form of starch).
Term
cereals
Definition
grasses grown for their edible grain.
Term
germ
Definition
embryo rich in protein, oil, vitamins and minerals
Term
endosperm
Definition
stored food supply for embryo, mostly starch with a little protein.
Term
cereals
Definition
grasses grown for their edible grain
Term
polished grain
Definition
only the endosperm (ex: white rice)
Term
whole grain
Definition
all but chaff (more nutritious with protein, fiber, and vitamins)
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