Plant Growth Flashcards
1
Q
Hormones
4 points
A
organic
natural
higher plants
place of production to the remote site (in a minute)
2
Q
Growth promoter
(Auxin, GA, Cytokinin)
(5 points)
A
- Promotes flowering, germination
- Breaks seed dormancy
- delay leaf senescence, ageing, abscission
- Induces parthenocarpy
- Cell division, cell enlargement
3
Q
Growth inhibitors
(Ethelyn, ABA)
(2 points)
A
-Induces abscission, senescence
4
Q
Auxin History (4 points)
A
- Darwin - cut coleoptile+light - towards
- Boysen-Jensen - cut coleoptile+gelatin+light - towards
- Paal - cut coleoptile(asymmetrically) away
- F.W.Went - avena agar+cut coleoptile(asymmetrically) - towards
- Urine-pellagra
5
Q
Auxin where
A
growing tip and meristematic region
6
Q
Auxin e.g.
4 points
A
IAA
IBA
NAA
2,4-D
7
Q
Auxin effect (4 points)
HARD
A
- Apical dominance
- increase respiration
- early differentiation
- herbicide to kill dicot plants without affecting monocot plants
8
Q
Gibberellin where (4 points)
A
young leaves, seeds, roots, stem tips
9
Q
Gibbereline e.g.
3 points
A
GA3 - Gibberellin ring
Melanovic acid
150
10
Q
Gibberellin history (4 points)
A
Gibberella fujikuroi - Kurosawa - bakane disease
- crystalline - Yabuta & Sukumi
11
Q
Gibberellin effect (6 points)
A
- Promotes bolting
- Elongation of the stem
- reverses dwarfism
- Induces maleness in certain plants
- vernalization
- increases internode length
12
Q
Cytokinin History (2 points)
A
Lentham - coined
Skoog & miller - kinetin - discovered - tobacco
13
Q
Cytokinin e.g.
4 points
A
- zeatin
- 6-benzyl adenine
- 7 other
- chemical - 6-furfuryl amino purine
14
Q
Cytokinin effect (6 points)
A
- promotes lateral and adventitious shoot growth
- RNA synthesis
- overcomes apical dominance induced by auxins
- Stimulate the formation of chloroplast in leaves
- Promotes nutrient mobilization
- formation of IFC
15
Q
Ethylene history (3 points)
A
Denny (1924)
Gane (1934)
Crocker (1935)
