Plant Growth Flashcards
Hormones
4 points
organic
natural
higher plants
place of production to the remote site (in a minute)
Growth promoter
(Auxin, GA, Cytokinin)
(5 points)
- Promotes flowering, germination
- Breaks seed dormancy
- delay leaf senescence, ageing, abscission
- Induces parthenocarpy
- Cell division, cell enlargement
Growth inhibitors
(Ethelyn, ABA)
(2 points)
-Induces abscission, senescence
Auxin History (4 points)
- 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
Auxin where
growing tip and meristematic region
Auxin e.g.
4 points
IAA
IBA
NAA
2,4-D
Auxin effect (4 points)
HARD
- Apical dominance
- increase respiration
- early differentiation
- herbicide to kill dicot plants without affecting monocot plants
Gibberellin where (4 points)
young leaves, seeds, roots, stem tips
Gibbereline e.g.
3 points
GA3 - Gibberellin ring
Melanovic acid
150
Gibberellin history (4 points)
Gibberella fujikuroi - Kurosawa - bakane disease
- crystalline - Yabuta & Sukumi
Gibberellin effect (6 points)
- Promotes bolting
- Elongation of the stem
- reverses dwarfism
- Induces maleness in certain plants
- vernalization
- increases internode length
Cytokinin History (2 points)
Lentham - coined
Skoog & miller - kinetin - discovered - tobacco
Cytokinin e.g.
4 points
- zeatin
- 6-benzyl adenine
- 7 other
- chemical - 6-furfuryl amino purine
Cytokinin effect (6 points)
- 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
Ethylene history (3 points)
Denny (1924)
Gane (1934)
Crocker (1935)
Ethylene where (3 points)
SAM, root, ripen fruit
Ethylene effect (4 points)
-promotes ripening of fruits
-Controls epinasty of leaves
-initiation of lateral roots
Stimulates rapid elongation of petioles and internodes
-gaseous
-de-greening
-increasing the absorption surface
-Stimulates femaleness in monoecious plants
-Apical dominance
Abscisic acid where
4 points
fruit, leaves, roots, seeds
Abscisic acid e.g.
1 point
15-carbon sesquiterpenoid
Abscisic acid effect
4 points
- Inhibits seed germination, cell elongation, and enlargement
- Accelerates dormancy
- closes of stomata
- suppresses cambium activity
