Amplitude =Intensity foot-candles | 10,000 fc sum/noon 1000 fc winter 100 fc house | |
= Color |
CO2 + H2O | light ----------> chlorophyll | CH2O sugar | + O2 |
Light-Dependent Reactions:
H2O light
---------->
chlorophyllO2 + ATP + NADPH2 Light-Independent Reactions
ATP + NADPH2 + CO2 ----------> CH2O
sugarNote: Light-Independent Reactions are dependent on the products of the light-dependent reactions...so they only occur in the light!!
(Hint: Chlorophyll is green!)
chrysanthemum poinsettia | lettuce spinach | ||
---|---|---|---|
One 24-hr Day of a sequence: | SDP=LNP | LDP=SNP | |
16 hr Day = LD | 8 hr Night = SN | vegetative | flowering |
Here are conditions as found in the short days of fall (or spring):
chrysanthemum poinsettia | lettuce spinach | ||
---|---|---|---|
One 24-hr Day of a sequence: | SDP=LNP | LDP=SNP | |
8 hr Day = SD | 16 hr Night = LN | flowering | vegetative |
Interrupting the night...
chrysanthemum poinsettia | lettuce spinach | ||||
---|---|---|---|---|---|
One 24-hr Day of a sequence: | SDP=LNP | LDP=SNP | |||
8 hr Day = SD | 8 hr Night = SN | Light 10 sec | 8 hr Night = SN | vegetative | flowering |
Interrupting the day...
chrysanthemum poinsettia | lettuce spinach | ||||
---|---|---|---|---|---|
One 24-hr Day of a sequence: | SDP=LNP | LDP=SNP | |||
8 hr Day = SD | Dark 10 sec | 8 hr Day = SD | 8 hr Night = SN | vegetative | flowering |
Using a red-light interruption:
chrysanthemum poinsettia | lettuce spinach | ||||
---|---|---|---|---|---|
One 24-hr Day of a sequence: | SDP=LNP | LDP=SNP | |||
8 hr Day = SD | 8 hr Night = SN | Red 10 sec | 8 hr Night = SN | vegetative | flowering |
Using far-red light interruption:
chrysanthemum poinsettia | lettuce spinach | ||||
---|---|---|---|---|---|
One 24-hr Day of a sequence: | SDP=LNP | LDP=SNP | |||
8 hr Day = SD | 8 hr Night = SN | Far-red 10 sec | 8 hr Night = SN | flowering | vegetative |
SDP(LNP) LDP(SNP) Interrupting sequences ending in RED vegetative flowering
Interrupting sequences ending in FAR-RED flowering vegetative
Recall: Similar R/FR relationship applies to lettuce seeds!
Chrysanthemum Story with Driveway-What is the solution?Poinsettia Story inside house-what is solution?
Lettuce Bolting Problem in garden-what is solution?
Tuberization: SDP (Long Nights Too):
Potato, Jerusalem Artichoke, Dahlia TubersBulb Development: LDP (Short Nights Too):
Onions...need long season to make large bulbs!
Bermuda: forms bulbs when day 11 hours or longer
planted in early spring to grow bulbs in CTSpanish: forms bulbs when day 15-16 hours or longer
day already longer than 11 hours....bulbs form right away...tiny
planted in fall in TX days short, weather mild, large plant
day gets longer than 11 hours in summer, large bulbs form
planted in early spring to grow bulbs in CT
plant gets large before bulbs begin to grow...large bulbs in CT
night day never gets to 15-16 hours...no bulbs ever in TX
Shade Lovers:
Inside: Ferns, African Violets, Philodendron, Dieffenbachia
Outside: Ferns, Hosta, Astilbe, Begonia, Impatiens
Duration: 16 hours (use a timer)
Intensity:Incandescent = hot, red, dry
Fluorescent = incomplete blue, dim
GrowLux = more complete, dim
    (use many tubes, close together)
Metal Halide/Sodium Mercury Vapor: bright, complete, HOT, expensive
    Cops will make a house call (DEA)
Go back to the Course Schedule.