Seeing the Light
This unit, abbreviated nm, is used to measure wavelength.
What is the nanometer?
Most horticultural plants use this pathway.
What is C3?
Flowering is controlled by the length of this.
What is night?
A day of 72°F and a night of 62°F is this DIF.
What is +10?
This moist chilling treatment helps seeds break dormancy.
What is stratification?
Plants absorb these two colors of light best.
What are red and blue?
This enzyme, the most plentiful on Earth, can mistakenly fix oxygen instead of CO₂.
What is RuBisCo?
Poinsettias and chrysanthemums are this type of plant.
What are short-day, or long-night, plants?
A day of 62°F and a night of 70°F is this DIF.
What is −8?
Sprinklers and wind machines can't help with this long-lasting kind of freeze.
What is an advective freeze?
These accessory pigments pass energy to chlorophyll a and protect chloroplasts from intense light.
What are carotenoids?
This wasteful process rises when stomata close in the heat and CO₂ drops.
What is photorespiration?
Cucumbers, corn and dandelions bloom once adult regardless of day length, so they are this type.
What are day-neutral plants?
With a base of 50°F, a low of 44°F and a high of 70°F, you get this many GDDs.
What is 10?
These are the hours between about 32 and 45°F that buds need.
What are chilling hours?
Leaves turn this color, called chlorosis, from disease, nutrient deficiency or too-bright light.
What is yellow?
These plants open their stomates at night and store CO₂ as a 4-carbon molecule.
What are CAM plants?
These red-light receptors act like Pr and Pfr switches and detect photoperiod.
What are phytochromes?
With a base of 10°C, a maximum of 30°C, a low of 7°C and a high of 35°C, you get this many GDDs.
What is 10?
Tulips and daffodils need this cold period to flower properly.
What is vernalization?
Excess sugars from cool nights increase production of this pigment, giving brighter fall reds.
What is anthocyanin?
In this pathway, PEP carboxylase grabs CO₂ first and hands the carbon to RuBisCo; corn and bermudagrass use it.
What is C4?
Interrupting the night with this kind of bulb, rich in red light, stops short-day plants from flowering.
What is an incandescent bulb?
Base 40°F, maximum 85°F: Day 1 is 38/60 and Day 2 is 44/91. The two-day total is this.
What is 34.5? Day 1 = 10, Day 2 = 24.5.
Freezing so fast that ice crystals don't form, which even tropical tissue can survive.
What is cryopreservation?