Dormancy Flashcards
1
Q
DORMANCY
A
- inability of seed to germinate under harsh environment
2
Q
DORMANCY IN WEEDS
A
- more pronounced as they have not undergone genetic improvement/manipulation
3
Q
TYPES OF DORMANCY
A
- primary
- secondary
4
Q
PRIMARY DORMANCY
A
- innate dormancy
- inherent property of ripened seed
- initiated when seed separates from plant/seed
5
Q
SECONDARY DORMANCY
A
- enforced dormancy
- due to existence of unfavorable environment
6
Q
CAUSES OF PRIMARY DORMANCY
A
- existence of immature embryo
- impermeable seed coat
- after ripening requirement
- environmental stimuli
- presence of endogenous chemical inhibitors
7
Q
CAUSES OF SECONDARY DORMANCY
A
- light
- lack of moisture
- temperature
8
Q
IMPORTANCE OF DORMANCY ON WEEDS
A
- allow perpetuation of weeds over time
- allow dispersal time
- escape harsh environment
- contributes to difficulty in controlling weeds
