Temperature does effect root growth. For my understanding, dormancy occurs 2 times a year for me in Texas, winter and summer. During these 2 seasons roots do not grow, they only grow in spring and fall. Most of the time when I repot it’s late winter, meaning that roots are just waking up or just starting to grow- the white tips.
For some of us it could be late February or March, depending on cold climate zones to semi tropical zones. Most of us have to protect it from late freezes which can occur after winter into spring.
For grafting I must break the dormancy in a greenhouse in a much warmer temperature just to get sap flowing, which is about the time white root tips starts to show up.
So assuming that I was to live in Brasil, the lowest temperature in winter in some area might not even dip below freezing, but at that time should be perfect to repot because root production is at its minimum and it’s getting ready to warm up for faster growth.
As for air-layering, some people do it after the first flush of growth or even during winter, I tend to do mine during late summer because fall is the second season of root production but as for pines Muranaka bonsai a has several example on layering pines.
For dormancy, I think seeds needs at least 60 to 90 days so the I guess the tree itself needs it to. But I stratified mine in the top shelf of my refrigerator which is above freezing, I think it’s at 35 to 40f.