Re: iris DIGEST V1 #68

 I susspect that there are a number of genetic factors in rebloom, as well as 

several types of rebloom.



The type of rebloom that I get with FB is much different then what seen in most

?rebloomers, and basically seems to be not complemetary with other rebloomers. 

I used to think that vigourous growth was an absloute necessity, but Bella Rosa 

barely hangs on, yet reblooms almost every year. A poor grower. Strong growth is 

a factor with most rebloomers, as is eary bloom for it's type. 



I suspect that for most rebloomers  there is a need for a temperature differential 

between day and night , or some cool nights. I suspect some early rebloom is "leftover"

spring bloom. That is, the buds were already set, but plant wasn't quite big enough in

?spring to reach the cultivar's "Trigger Size" (the size of rhizome necessary to trigger 

a bloom stalk). Thus basically a delayed bloom. 



I havn't seen any other species in FB aside from the pumilla genes.



As we have noted, sequence of rebloom seems different in colder climates then in warmer 

climates. Colder climates seem to follow in reverse of spring bloom. I have never had any 

rebloom on TBs before August, usually late August. Immortality is usually first TB to bloom here, 

and FB etc have been in rebloom for nearly three months before Immprtality breaks open. Definatly

?a different rebloom type.



Chuck Chapman









Date: Thu, 16 Nov 2006 08:17:28 -0500

From: Linda Mann <lmann@lock-net.com>

Subject: [iris] Re:REB: daylight independent rebloom



Thanks Chuck.  Add Tom's comments about mellita (?) to that list of 

species contributing rebloom potential.  Nothing with irises is ever 

simple <g>



One of the reasons I've made so many crosses with IMMORTALITY is to try 

to make sure that all my babies will have the <same> daylight 

independent set of rebloom genes to increase probability of "everbloom" 

  (takes less typing than "daylength independent rebloom" <g>) in 

subsequent generations.



Very interesting that crossing two superstrong "everbloomers" (SDB X TB) 

didn't produce <any> rebloom seedlings!  Have you tried sending any of 

them to the US west coast to see if they rebloom there?  Any sib crosse 

results?



Judging from all the multiple stalks from one fan/heavy branching that's 

showing up in my lines from IMM, my guess was that she carries a 

collection of aphylla rebloom genes.  I plan to get one of Vickie's 

tetraploid reblooming aphylla types to test that idea.  If IMM and 

aphylla carry the same package of rebloom genes, then crosses between 

the two should all rebloom (??); if not, I expect none, like your cross, 

Chuck.



If there's some overlap of genes, then I guess some would everbloom, 

some not?   Or maybe the mismatched chromosomes from such a cross will 

mess things up.



Chuck, are there other species in the background of FOREVER BLUE and 

WHAT AGAIN that might be the source of rebloom?  Have you tried crossing 

either of these with a reblooming 'pure' aphylla?  If these and IMM both 

get their rebloom ability from aphylla, any ideas as to why the babies 

might not rebloom?  Do they maybe need 4 doses that just aren't there in 

the IBs?



Another couple of 'everbloomers' here are I DO and SUNNY DISPOSITION. 

SD is IMMORTALITY X HARVEST OF MEMORIES.  So far, one everbloom seedling 

from IMMORTALITY, HARVEST OF MEMORIES, & CELEBRATION SONG breeding.  Two 

data points that lead me to conclude that either IMM and HoM have the 

<same> package of rebloom genes or complimentary sets of them that can 

combine to produce everbloom.



Chuck, others, any thoughts on dominance/recessive nature of everbloom? 

  For IMM seedlings here, my impression is that both daylength 

independence and rebloom are dose related but I can't quite see how it 

works.



Betty (correct me if I'm misquoting) has told me that if I get rebloom 

from a rebloom X non-rebloom (in our eastern climate), that implies the 

non-rebloomer carries rebloom and probably can rebloom under just the 

right growing conditions (i.e., California <g>).



So far, I haven't gotten any rebloomer (daylength independent or not) 

seedlings from two non-reblooming parents, no everbloomers unless at 

least one parent is an everbloomer.  Haven't attempted any everbloom X 

everbloom crosses yet.  All TBs.



I tried several non-rebloom X non-rebloom sibling crosses using IMM 

children this year for the first time, so may be able to understand 

what's going on a little better by late next year, if I'm lucky.  But 

won't know for sure how those genes mix with HoM rebloom genes for a 

while.  HoM is a spring/fall bloomer here, but doesn't seem to require 

temperatures to get quite as cold to initiate rebloom in the fall as 

some do, so usually produces a lot of bloom before being frozen out.



Not sure where that type of early but daylength dependent bloom fits 

into the big scheme.



I've always assumed that there is a temperature component for the 

daylength dependent rebloomers.



Maybe some of the rebloom species have a different temperature threshold?



Definitely too much caffeine this AM! <g>



> Forever Blue. Blueberry Tart etc, will bloom very early in SDB seasnon, and 

continue blooming for quite awhile, almost until end of TB bloom. They then take 

a week break, and then start up again and rebloom sporatically until heavy 

frost. 

>  

>  I have not seen this kind of rebloom in any TBs. I had thought that perhaps 

Immortality was of this ilk, but when crossed with FB, there was no rebloom in 

any of the seedlings. I have seen some early blooming TBs and heard of early 

bloom, as July or Aug in other areas, but in these locals, TB bloom probably 

ended in May, so thus at least two months after spring bloom.

>  

>  I suspect there is several types of rebloom.

>  

>  In old literature there are accounts of almost continuous bloom in Iris 

chamiris (sp?) which is a dwarf iris.

>  

>  I have found aphylla in background of FB and in What Again, on both sides of 

parentage.

>  

>  Chuck Chapman







   
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