Lec #4 What is the Minimum Amount Light a Plant
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Transcript of Lec #4 What is the Minimum Amount Light a Plant
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7/30/2019 Lec #4 What is the Minimum Amount Light a Plant
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What is the minimum amount
light a plant will need?
Plant Physiology
Lecture #31-26-09
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8- to 120mmol m-2S-1
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What is meant by photoperiod?
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It refers to the duration interms of day length
classification (short day, long day, day neutral
plants)
A response of flowering
The amount of daylight (length) duration
needed for a plant to flower.
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Why do plant flower in response
to light?
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Because of phytochrome
Plant color
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Distinguish between the two
main phytochromes.
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Pr = absorbs red light at 680 nm
Pfr = absorbs far red light at 730 nm
These are photo reversible
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Discuss the 3 developmental
response of plants to light
(red: far red)
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Seed germination Related to seed in forest
Seeds that response to light to germinate Which do not get much light = low light
Germinates when there is a gap in forest cannopy Evasion (most leaves absorb blue/red light)
Purslane evades far red light
Morphology Plants grow in narrow spacing and high density
Longer internodes Few branches
Related to low R:Fr ratio
More biomass
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What is negative phototropism?
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Plant growing away from light (because of the
quality of the light as appose to the intensity)
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Discuss the plant nutrient needs.
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Plants absorbs more than 90 nutrients
About 17 are essential
13 used in large amounts
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Show in order of abundance the 6
important minerals needed for plant
growth
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N> K> Ca> Mg> P> S
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What 3 elements makes up 95%
of plant needs?
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C , H, O
They produce carbohydrates in plants
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Give an example of a mineral
that is toxic to plants.
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Pb
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List three essential criteria for
plant nutrients
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1. A lack will stop plant growth
2. Elements is directly involved in nutrition of
plants and not merely taking up space.
3. A shortage can be corrected only by
supplying that element.
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Discuss a plants response to N.
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N speeds up growth
Produce dark green leaves
High protein content Improves water use when
there is an ample supply
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Lists ion picked up by plants in
abundance.
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NO3-
NH4+
HPO4-2
H2PO4-
K
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What happens with too much N?
list six adverse effects ?
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Soft weak and easily injured
More prone to disease
Overly rapid growth and slows maturity Delays hardening off (reducing water
application )
Impairs flowering in vegetable crops Increases risks to humans
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How does too much nitrogen in
plants increase risks to human?
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Oxalic acid
Interferes with Ca++ absorption
Methemoglobinia
Blue-baby syndrome
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