Plant Hormones system Flashcards
1
Q
Hormones travel via
A
Vascular system
2
Q
Cell-to-cell communication via
A
plasmodesmata
3
Q
In plants…
A
Potentially any cell can produce any hormone due to the lack of specialized glands
4
Q
Plant hormones are…
A
Auxins, Cytokinins, Gibberellins, Abscisic acid, Ethylene, systemin, Methyl salicylate
5
Q
Auxins
A
- Master Growth regulator
- Main hormone responsible for cell elongation
- Apical dominance triggered by auxins produced in the apical meristem
- Inhibition of abscission
- flower fruit ripening
6
Q
Cytokinins
A
- Cell division
- Most abundant in growing tissues like roots, fruits, and embyros
- Can delay senescence (aging)
- stimulates cell differentiation in meristem in roots and shoots
- promotes mitosis
- Controls plant development
7
Q
Gibberellins
A
Group of 125 closely related hormones
- Stimulate shoot elongation, seed germination, and flower and fruit maturation
- delay senescence
- break seed dormancy
- major antagonist is abscisic acid
8
Q
Abscisic Acid
A
- Cause abscission
- Accumulates as a response to stressors, like drought and cold
- Inhibits stem elongation
- Induces dormancy
- closes stomata to reduce water loss
- Blocks Germination
- Promotes synthesis of storage proteins
9
Q
Ethylene
A
- Aging
- Promotes flower wilting, fruit ripening, and leaf fall
- volatile gas
- stimulates the conversion of starch and acids into sugars
- in aging tissue
10
Q
Systemin
A
- Anti-herbivore hormone
- Deters Herbivores from eating plant
- produced everywhere
- initiates the production of compounds like jasmonic acid
11
Q
Methyl Salicylate
A
- Immune system
- reponds to infections
- induces hypersensitive response which induces a systemic acquired response in plants
12
Q
Phototropins
A
Responsible for carrying out phototropic response
- leaf opening and closing
- chloroplast movement
- opening stomata for gas exchange
13
Q
Detection of light in apical meristem performed by…
A
Phot 1 and phot 2, both phototropins that specifically detect blue light
