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


Hi Everybody,
      Some may be wondering about the terms sectorial, mericlinal, and periclinal in reference to types of chimeras in Hosta. I've prepared a diagram which I hope explains it well enough. In a sectorial chimera, a section of mutated tissue runs through the L1 and L2 layers as if there was no boundary. In a mericlinal chimera, the new tissue is restricted to one layer or the other, so you get part of an edge or part of a center. A periclinal chimera is the most stable by far with a complete edge or center.
      I've grown quite a few hosta seedlings over the last few years so may be able to help with Joe's questions. What I've seen is about 0 to 1.0% of seedlings from non-streaked parents showing sectorial or mericlinal chimeras, with the percentage varying from one batch of seed to the next. These are very unstable and few persist or convert to periclinals. Rarely will one appear as a periclinal or one of the others convert. Also rarely one will appear as a streaked sport.
      I don't know what streaked plants are, and I'm not sure if anyone really understands them. What is clear is that they do not follow the rules about the other types of chimeras. Their offspring are also streaked in large percentages and these streaked offspring convert to periclinal chimeras with varying frequency. What separates them in appearance is bands of tissue in which the two different colors are mixed together, like mixed jellybeans. I have found the presence of this mixed tissue to be a reliable predictor of streaked progeny. Some say the percentages of all-green, all-white, and mixed tissue are reflected in the seedlings, but I haven't watched for this myself. In past issues of the Journal, I remember Kevin Vaughn, Herb Benedict, Jim Wilkins, and Ed Elslager commenting on this. 
      I have a question for all------ Does the phenomenon of streaking as we know it occur in any other genus? I have seen similar patterns, but do these plants yield streaked offspring?
                                                                                                                .......Bill Meyer


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