RE:CULT:Vernalization
- Subject: RE:CULT:Vernalization
- From: C* C*
- Date: 25 Oct 00 06:45:59 EDT
There definatly some sort of connection between the need (or rather the lack
of need for) vernalization and rebloom.This is one of several factors present.
Sometimes cold evenings will provide a trigger that will help rebloom. Lloyd
Zurbrigg has comented that I can get good rebloom here in the summer that he
doesn't get as his evenings are too warm. The converse is that the cool
eenings can trigger something in the plant. A modifier gene can possibly
reduce how much/how long cool weather is needed. I have noted that many
rebloomers will rebloom dependent on length of daylight. That is they will
rebloom at the time that daylight hours past equinox equals the amount of
daylight hours before equinox triggered bloom. Thus (for example)when the
daylight hours are 12 hours in the spring there is the start of bloom and in
the late summer /early fall when daylight hours are again 12 hours, rebloom
can be triggered. I have noted this particularly with SDB, with most
rebloomers blooming later in the season then the TB rebloomers. There is a
reverse corelation( not 100%)between when they bloom in the spring and when
they rebloom. That is the last to r\rebloom is oten one of the earliest to
bloom in the spring.You can get fall bloom this way sometimes when for some
reason (usually immaturity) the plant didn't bloom in spring.
Some of the fall fruiting plants such as strawberries and raspberries are
referred to as daylight independant. I use this term for those rebloomers that
don't seem to need a particular lenght of daylight to trigger rebloom. FOREVER
BLUE definatly fits this catagory as it seems to bloom whenever a plant is
mature enough. The degree of venalization needed for these plants is definatly
less then other plants and perhaps entirely absent. When you get third and
fourth generation plants blooming before winter sets in, then there seems to
be very little need for vernalization. Rebloomers for the most part, are very
vigouous growers. Vernalization, in nature is a survival mechaniam. Plants
blooming "whenever" will often not survive winter as they are too immature and
will not produce mature seed before winter and thus not survive well. When
plants are exceptionally vigorous fall bloom will not kill off the plants.
Thus vernalization gene absence or damaged seems to be one factor for the
stronger rebloomers or daylight independent rebloomers. Some of the daylight
dependent rebloomers could have some vernalization present with the new shoots
having gone through a winter but the plants being just babies in spring.
Some food for thought, Please feel free to comment.
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