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bio 20b
plant physiology
61
Biology
Undergraduate 2
06/09/2007

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Term
Acid- growth hypoth
Definition
auxins effect on plant cell elong. Occurs via proton pumps that make wall more acid, thus expanding
Term
Abscisic acid
Definition
inhibits cell elongation, stimulates leaf shedding and dormancy
Term
Adventitous
Definition
roots that develop from the shoot system
Term
Apical meristem
Definition
undifferentiated cells tip of stem or root, primary growth
Term
Apoplastic route
Definition
water traveling around cells
Term
Arbuscular mycorrhizae
Definition
fungi whose hyphae enter root cells of host
Term
Auxin
Definition
Indoleacetic acid, stimulates phototropism, other responses
Term
Bulkflow
Definition
movement of fluid due to pressure difference
Term
Calvin cycle
Definition
turns ATP and NADPH into sugar by reducing CO2
Term
Carotenoids
Definition
absorb light not absorbed by chlorophyll, usually red, orange,red (incl. carotenes, xanthophyll)
Term
Casparian strip
Definition
waxy layer that prevents water from entering cells of root
Term
Cohesion
Definition
water molecules cling together. Resist disruption
Term
Cohesion-tension theory
Definition
water moves up plants due to transpiration which pulls water up
Term
Collenchyma
Definition
elongated cell with thick walls, used for support near veins/stalks
Term
Cork cambium
Definition
ring of undiff. cells found under cork layer, produces new cork cells
Term
Cytokinin
Definition
stimulate cell division
Term
Dioecious
Definition
either male of female flowers, not both
Term
Ectomycorrhizal fungi
Definition
fungi whose hyphae form network covering outside of roots
Term
Endodermis
Definition
separates cortex from vasc. tissue
Term
Epidermis
Definition
outmost layer of cells
Term
Epiphyte
Definition
plant that grows on trees, not rooted in soil
Term
Fibers
Definition
elongated schlerenchyma cells, supports vasc. tissue
Term
Gametophyte
Definition
multicellular haploid phase, arises from spore, makes gametes
Term
Gibberellic acid
Definition
stimulates elongation of shoots
Term
Grana
Definition
stack of thylakoids in chloroplast
Term
Heartwood
Definition
nonfunctioning xylem, has protective cmpnds
Term
Hyphae
Definition
strands of fungal mycelium, meshlike
Term
Lichen
Definition
fungus and photosynthetic alga
Term
Lignin
Definition
strong polymer in secondary cell walls of woody plants
Term
Megasporocyte
Definition
diploid in megasporangium of ovule, makes 4 megaspores
Term
Meristem
Definition
undiff. plant cells that produces diff. cells that make spec. tissues
Term
Monecious
Definition
having both male and female flowers
Term
Mycorrhizae
Definition
mutual assoc. between fungi and vasc plants, look like nets or modules
Term
Parenchyma
Definition
thin wall plant cell in leaves, stems, roots, fruit. Photosyn, food storage
Term
Perfect/Imperfect
Definition
has both male,female parts/ having one or the other, not both
Term
Pericycle
Definition
cells that give rise to lateral roots
Term
Pith
Definition
center of stem
Term
Plasmodesmata
Definition
connections between two cell’s ER/cytoplasm/membranes, gaps in cell wall
Term
Pneumatophyte
Definition
air roots
Term
Primary growth
Definition
increases in stem/root length by apical meristems
Term
Reaction center
Definition
central area of LD-rxn , surrounded by chlorophyll mcs of antennae complex, receives energy from them
Term
Rhizobia
Definition
N-fixing bacteria that live in roots of peas
Term
Rhizomes
Definition
horizontal, underground stem
Term
Root hair
Definition
thin outgrowths from roots, increases surface area
Term
Sapwood
Definition
young xylem, helps water transport
Term
Sclereid
Definition
sclerenchyma cells functioning in protection (seed coats,nutshells)
Term
Secondary growth
Definition
increases root-stem width
Term
Sclerochyma
Definition
thick walled cell providing support and contains lignin, dies at maturity
Term
Spines
Definition
modified plant leaf, for protection
Term
Spongy mesophyll
Definition
round parenchyma cells in ground tissue for gas exchange
Term
Sporophyte
Definition
multicellular diploid phase, arises from 2 gametes, produces spores
Term
Stroma
Definition
Fluid between chloroplast membrane and thylakoid disks
Term
Stolon
Definition
modified horizontal stems running over soil surface
Term
Symplastic route
Definition
water traveling thru cells
Term
Taproot
Definition
large vertical main root
Term
Tendrils
Definition
modified stems for climbing
Term
Thylakoid
Definition
flattened disk in chloroplast, stack = granum
Term
Tracheid
Definition
elongated water- conducting cell with gaps to allow water movements
Term
Vascular cambium
Definition
ring of undiff. cells in cork camb, produces secondary xylem/phloem
Term
Vascular tissue
Definition
tissue involved in conducting water/solutes, or gives rise to such tissues
Term
Xanthophyll
Definition
carotenoid pigments, usually yellow
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