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Legume structure, morphology, physiology
part of test 1
70
Agriculture
Undergraduate 4
01/25/2017

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Term
what makes legumes unique
Definition
Rhizobium – N fixation
Term
something about forage chickory
Definition
drought tolerant succulent forb
Term
something about Brassicas, such as rape and canola
Definition
potential, but unproven in GA
Term
some types of brassicas
Definition
-rape
-canola
Term
which part of the legume seed is number 1?
[image]
Definition
epicotyl
Term
which part of the legume seed is number 2?
[image]
Definition
plumule
Term
which part of the legume seed is number 3?
[image]
Definition
cotyledons
Term
which part of the legume seed is number 4?
[image]
Definition
seed coat
Term
which part of the legume seed is number 5?
[image]
Definition
embryo groove
Term
which part of the legume seed is number 6?
[image]
Definition
radicle
Term
which part of the legume seed is number 7?
[image]
Definition
hypocotyl
Term
which part of the germinated legume seed is number 1?
[image]
Definition
epicotyl
Term
which part of the germinated legume seed is number 2?
[image]
Definition
cotyledons
Term
which part of the germinated legume seed is number 3?
[image]
Definition
split seed coat
Term
which part of the germinated legume seed is number 4?
[image]
Definition
radicle with secondary roots
Term
the plumule becomes the...
Definition
shoot
Term
the radicle becomes the...
Definition
root
Term
depiction of the germination process in legume seeds
Definition
[image]
Term
some hormones in the seed that counteract each other
Definition
Gibberellic acid and abscisic acid counteract each other
Term
why seeds need a reserve to grow
Definition
because they can’t directly pump nutrients yet
Term
what makes the cotyledons go above the soil in epigeal germination?
Definition
the hypocotyl pushes the cotyledons up
Term
the nodules on legume roots that are active
Definition
the pink ones
Term
depiction of how legume roots develop nodules
Definition
[image]
Term
why many legumes have to be inoculated for N fixation
Definition
because of not being native to the region
Term
what causes a nodule to form in a legume root?
Definition
cortical cells multiplying out of control
Term
the mutual relationship between legumes and Rhizobium bacteria
Definition
-Bacteria provides plant with N and plant provides bacteria with nutrients
-If their environment is deficient in N, then they fix soil atmospheric N into the plant. C skeletons from photosynthesis provide structures for amino acids.
Term
how bacterioids occur in legumes
Definition
Cells in nodules have multiple odd-shaped bacteria called bacteroids.
Term
mutualism
Definition
where two organisms co-exist, both benefiting from their relationship.
Term
can plants convert atmospheric N into useable N?
Definition
no
Term
the useable form of N
Definition
ammonium (NH4+)
Term
what Rhizobium bacteria uses to fix N
Definition
nitrogenase
Term
why nitrogenase doesn't like oxygen
Definition
because oxygen would oxidize it
Term
a protein in legumes that has a high affinity for N
Definition
Leghemoglobin
Term
why legumes need rhizobia
Definition
to fix N
Term
the growth habit of alfalfa
Definition
upright
Term
the growth habit of white clover
Definition
prostrate
Term
the growth habit of red clover
Definition
decumbent
Term
[image]
Definition
alfalfa
Term
[image]
Definition
white clover
Term
[image]
Definition
red clover
Term
why soybean was brought to the US
Definition
Soybean was brought to the US as a forage crop
Term
upright
Definition
grows upward
Term
prostrate
Definition
grows laterally and covers soil surface
Term
Decumbent
Definition
growth habit that is between upright and prostrate
Term
can alfalfa tolerate grazing?
Definition
no
Term
Plant grows back from the...
Definition
crown
Term
what is this?
[image]
Definition
crown buds on alfalfa
Term
a certain characteristic of grazing tolerant cultivars of alfalfa and why that is
Definition
-Those that are grazing tolerant tend to be winter dormant
-Crown morphology is the reason
Term
why it may not be possible to develop winter active, grazing tolerant alfalfa in the South
Definition
because selection for grazing tolerance tends to make alfalfa winter dormant again
Term
something about plants that is important for pasture management
Definition
the plant growth cycle
Term
what tillers do when plant grows tham
Definition
switch from vegetative to reproductive growth
Term
what legumes store in seed
Definition
energy and protein
Term
the bloom we target in alfalfa
Definition
20%
Term
determinate flowering
Definition
flowers all at once
Term
some forages that are determinate
Definition
red clover and some soybean
Term
what determines when a plant flowers?
Definition
Photoperiod and temperature
Term
White clover often planted with...
Definition
grass
Term
what's happening to this clover?
[image]
Definition
mosaic virus
Term
some details about forage chickory (Cichorium intybus)
Definition
-Member of the sunflower family (Asteraceae)
-Perennial cool-season herb which originated in Central Europe but was developed for forage production in New Zealand.
-Pure stands in New Zealand pastures yielded up to 22,300 pounds of dry matter per acre with crude protein content between 18 and 22 percent (comparable to annual ryegrass) and 62 to 77 % IVDMD.
-Chicory is suited to well or moderately drained soils with a soil pH of 5.5 or greater
-If chicory is grown without a legume partner, 100 to 150 lbs (N)/Acre should be applied in split applications: 1/3 at green up in early spring, 1/3 in early summer and 1/3 in early fall
-At peak growth periods, chicory produced 73 pounds of forage per acre per day.
-Maximum life of chicory stands with good quality will be about five to seven years
-Chicory should be grazed heavily, leaving a stubble height of 11⁄2 to 2 inches, for short periods of time.
-Intense grazing should prevent plants from bolting, which will extend the vegetative state and forage productivity.
-A rest period of at least 25 to 30 days between grazings will allow chicory stand persistence and optimum performance.
Term
which has a highe protein content? alfalfa or forage chickory?
Definition
alfalfa
Term
the type of forage forage chickory is
Definition
perennial cool-season
Term
If chicory is grown without a legume partner,...
Definition
100 to 150 lbs (N)/Acre should be applied in split applications: 1/3 at green up in early spring, 1/3 in early summer and 1/3 in early fall
Term
how chickory should be grazed and why
Definition
it should be grazed heavily because it’s fast growing and overgrown chickory loses quality
Term
Intense grazing of chickory should prevent plants from...
Definition
bolting, which will extend the vegetative state and forage productivity.
Term
some members of the brassica family
Definition
-kale
-forage rape
-turnips
-swedes
Term
some details about forage brassica
Definition
-Brassica forages are high quality, high yielding, fast growing crops that are suitable for livestock grazing.
-Both tops (stems plus leaves) and roots (bulbs) can be grazed and are very nutritious.
-Brassicas are very high in crude protein and energy, but extremely low in fiber.
-Weight gains by feeder lambs have been 0.2 to 0.4 lbs/day and 1.5 to 2.0 lbs/day for stocker cattle.
-Brassicas may best fit an early to late fall grazing program
Term
the very nutritious parts of forage brassica that can be grazed
Definition
Both tops (stems plus leaves) and roots (bulbs)
Term
Brassicas are very high in ______, but extremely low in ______.
Definition
crude protein and energy
fiber
Term
the grazing program that may be best for brassicas
Definition
Brassicas may best fit an early to late fall grazing program
Term
size of brassica seeds
Definition
very tiny
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