Exam 1 Flashcards
Legumes
member of the Fabacea 600 genra and 12,000 species can fix atmosperic nitrogen symbiotically with N-fixing bacteria often seeded into pasture as important component to increase forage quality and yield
Rhizobia
N-fixing bacteria that grow on nodules on roots
Monocarpellary
one-chamber, containing one seed per pod or a single row of seeds in a pod
2= alfalfa: more than one seed/pod
4= Hairy Vetch: more than one seed/pod
6= Korean lespedeza: one seed/pod
8= Cowpea: more than one seed/pod
1= sweetclover: one seed/pod
3=Red clover: one seed/pod
5= Common lespedeza: one seed/pod
7= Field Pea: more than one seed/pod
Legumes
-Seeds dehisces along sutures or ribs
Advantage: naturally disperse seeds
Disadvantage: problem for commercial seed production because of easy shattering
Legume Leaves
arranged alternately on stem, usually attached to the stem by a stalk called a petiole
Simple leaf
single leaf blade attached directly to the petiole
(unifoliate)
Compound leaf
three (trifoliate) or more leaf blades are individually connected to the petiole by a short stalk called the petiolule
Stipules
leaf-like appendages connected directly to the stem near the junction with petiole
Pinnate
when petiolule of central leaflet is longer than the lateral leaflets
Palmate
all petiolules are equally short in length
Most important stages
- Vegetative
- Elongation
- Boot
- Heading
- Anthesis
- Mature Seed
Vegetative
unelongation tillers producing leaves only
Elongation
elongated internode with elevating shoot apices
Boot
inflorescences are sheath of flag leaf
Heading
inflorescensces emerged and expanded
anthesis
flowers started shedding pollen
Mature Seed
fully developed inflorescences and ripened seed
Florets
grass flowers, consisting lemma, palea, and flower parts; two glumes are attached at the base of the spikelet
Inflorescence
reproductive part consists of spikelets (basic reproductive unit or floret)
-cluster of flowers
Spike
spikelets are sessile i.e. directly attached to rachis (central stalk)
e.g. wheat, western wheatgrass, perennial ryegrass