PLSC 206

Herbacide affected to broad leaf plants;widely used on lawns

"ABA"- prevents seed germination;little affect on abscission; Regulates water flow by triggering stomatal closure

Complete life cycle in single growth season

Control of axillary bud development(branching) by the apical bud

Stimulates stem elongation and cell enlargement; promotes reactivation of vascular cambium in spring in perennials

Plants that grow vegetatively throughout one growing season but flower and produce seed only second growing season

Induces seed production in biennials; Rosette plants produce seed the first year; Rapid stem elongation to initiate flower development

Needs 18 moles of ATP/mole glucose

Transports CO₂ from mesophyll to bundle sheath; needs 30 moles of ATP/mole glucose

Collective term for all light; intercepting plant parts-mostly leaves, but stems, fruit occasionally signifigant

CO₂ concentration at which plants show no net fixation of CO₂

Absorbs light in red and blue range; not green

Increase in fruit repiration and ethylene production just before repining

Stimulate cell division; Promotes mitosis

Reactions do not require light, if proper reactants are added (ATP, NADPH)

Daylength has no effect on flowering

A naturally-produced substance; Produced within the organism on which it is acting

Gas at room temperature; All parts of angiosperms; Large amounts by roots, nodes, flowers, ripening fruits; Promotes abscission of leaves and fruit; effects contagious

Conversion of liquid water to water vapor

Promotes flowering in long day plants; Inhibits flowers in short day plants

Ability of soil to hold water against gravity

Negative pressure potential

Upward growth of shoots and downward growth of roots

Stimulates flower and fruit development; Initiates flowering; Controls seed germination

Time from last freeze in spring to first killing frost in fall

"IAA"- Active compound in plant tissues; Produced in apical buds, young leaves, endosperm and embryo

Flower only when exposed to days of intermediate length

As light intensity increases above 0, CO₂ decreases because there is assimilation by photosynthesis

Chlorophyll absorbs light energy -> splits water -> creates ATP

The light intensity where the rate of photosynthesis does not increase when light intensity does

Flower only if daylight is greater than some critical lengths; Short-night plant

Ability of the water molecules to absorb to cellulose fibers

g CO₂ m² /hr assimilated in light; can also measure O₂ production; Total photosynthesis minus respiration)

Molecules of dissolved substances seperate water molecules, reducing interation among water molecules; Always negative

Require multiple years to complete life cycle

Light changes type of growth; A non-directional development response to a non-periodic, non-directional light stimulus

Same plants flower only at certain tiems of the year; In tropics, flowering occurs year round

Maintaining adequate CO₂ concentration in leaf depends on keeping stomates open

Assimilation of CO₂ in light; Light reaction and dark reaction- in chloroplast

Directed growth toward or away from light; Stonger than geotropism

Pigment involved in photoperiod and several other effects

Shoot tip removal, induces growth of axillary buds, increase branching and flower production

A physical pressure; May be positive or negative

Actual vapor pressure/saturation vapor pressure (%)

Is reverse of photosynthesis in terms of initial and final product

Vapor pressure at atmosphere maximum water holding capacity

Principal driving force for movement of water through plant; Evaporation from plant tissue

Outward force against cell wall

Fraction of atmosphere pressure exerted by water pressure

Difference between current vapor pressure and saturation vapor pressure

Water always flows passively from higher to lower water potential