hort.net Seasonal photo, (c) 2006 Christopher P. Lindsey, All Rights Reserved: do not copy
articles | gallery of plants | blog | tech blog | plant profiles | patents | mailing lists | top stories | links | shorturl service | tom clothier's archive0
Gallery of Plants
Tech Blog
Plant Profiles
Mailing Lists
    Search ALL lists
    Search help
    Subscription info
Top Stories
sHORTurl service
Tom Clothier's Archive
 Top Stories
New Trillium species discovered

Disease could hit Britain's trees hard

Ten of the best snowdrop cultivars

Plant protein database helps identify plant gene functions

Dendroclimatologists record history through trees

Potato beetle could be thwarted through gene manipulation

Hawaii expands coffee farm quarantine

Study explains flower petal loss

RSS story archive

Re: yellow color in Hosta


>In fact, yellow variegations are often hard to see in the lab.  The 
>yellow color develops only after the plant is put into high light 
>conditions.  This would seem to be counter to your argument about the 
>yellow color and its conversion requiring sunlight.

Actually, not really.  Some plants need light to trigger the final 
conversion of chlorophyll precursor to chlorophyll.  However, in a 
yellow leaved hosta it is most likely a dominant inhibitor that is 
blocking the final conversion of percursor to chlorophyll.  I suspect 
this inhibitor is probably present in different allelic forms.  Many 
of these inhibitor genes in plants are temperature sensitive.  I had a 
terrible problem with this in doing studies of anthocyanidin 
pigmentation in carrot roots.  When we would cut the roots in the 
field the carrots might be light purple, but after they were in cold 
storage a few weeks they would be dark purple.  Some hostas start out 
green and turn yellow later in the summer when the temperatures get 
warmer and in others they start out yellow and get more green as the 
summer progresses.  This could be a combination of temperature, light 
levels and diferent alleles of the inhibitor.  

Joe Halinar

To sign-off this list, send email to majordomo@mallorn.com with the

 © 1995-2017 Mallorn Computing, Inc.All Rights Reserved.
Our Privacy Statement
Other Mailing lists | Author Index | Date Index | Subject Index | Thread Index