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hugh.harries · hugh.harries@gmail.com | Group Owner  - Edit Membership Start a Group | My Groups
CICLY · Lethal Yellowing Disease of Coconut Palm

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Fwd: C I C L Y News from Jamaica   Message List  
Reply | Forward | Delete Message #2150 of 2180 |
Re: C I C L Y News from Jamaica

--- DOLLET Michel <michel.dollet@cirad.fr> wrote:
Cicly members who are doing research on some difficult
problems like the lethal yellowing of coconut cannot
spend their time in front of their computer...

Michel

Thanks for replying - but don't knock the people who
use a computer to do their research. Charles Darwin
and Blaise Pascal would have surfed the internet if it
had been available to them!

And no need to apologise on your co-authors' behalf -
it is their loss. When I was half the age I am now my
research involved regularly walking through acres of
LY trials in Jamaica, but I still took time to answer
letters (not emails) from people who wanted help - in
exchange for their information which was then compiled
in a (non-electronic) document that the FAO circulated
as an annual bulletin to maybe 300 people. Sometimes
there would be long delays before letters from
overseas correspondents were received - so your two
month response time maybe surprising today but is not
unusual.

What is also slightly surprising is a phytopathology
title "Recent lethal yellowing outbreak: why is the
Malayan Yellow Dwarf Coconut no longer resistant in
Jamaica?" appearing in "Tree Genetics & Genomes" until
it is seen that the author for correspondence and the
second author are both geneticists.

So may I invite them to join our discussion? They say
in the abstract that "The results of our analyses
showed more variation at 34 simple sequence repeat
loci in Jamaica than in the rest of the world
providing clear evidence for the presence of about 16%
of alleles that do not match the usual typical MYD
genotype. These alleles appear to have already been
present in the
introduced germplasm". Perhaps in their discussion
section they have explained that the main source for
the yellow Malayan Dwarf in Jamaica was bulk imports
from St Lucia in the 50s and 60s or a much smaller
source, Florida in the 40s, whereas their samples for
comparison, although IN different countries had (I am
guessing) all been introduced TO those countries
directly FROM Malaysia or indirectly FROM Ivory Coast
in the 70s or later? Only the 60s sources in St Lucia
were selected (by Dave Romney) and (LY susceptible) St
Lucia Tall palms in their neighbourhood were never
eliminated to prevent pollen contamination. The Ivory
Coast material was (probably) from block planting with
good isolation from contaminating (WAT) pollen sources
whilst any contamination by Malayan Tall pollen in the
original Malaysian blocks would not show in a DNA
analysis (correct me if I am wrong about that).

So it is fair to conclude that "The observed
heterogeneity may have caused some loss of resistance
but is insufficient to explain a massive outbreak of
the disease". After the publication of the Cedusa
paper a "second vector" hypothsesis may seem more than
likely.

I look forward to your next paper on Panama Tall and
hope it takes into account the 50 years of exposure to
pollen contamination from susceptible JT in Jamaica
contrasted to the geographical isolation of Pacific
Tall parents in Panama.

Lastly, please don't think I spend all day at the
computer - only as much time as it takes - retirement
does not reduce the workload elsewhere!

Thanks again for your detailed reply. I hope other
members will also respond to it.

Hugh


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Thu Jul 26, 2007 12:47 pm

Hugh Harries <harrieshc@yahoo.com>
hugh.harries
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Message #2150 of 2180 |
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Hello all, I would appreciate any comments or information on the issue below. Thanks and regards, Dagmar Hanold ... Dr Dagmar Hanold Plant Virology School of...
Dagmar Hanold
dagmar.hanold@adelaid...
Send Email
May 10, 2007
1:41 pm

Dagmar It seems I was wrong to think that CICLY members might have an opinion on your question "does this . . . mean that dwarf and hybrid resistance has...
Hugh Harries
hugh.harries
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May 21, 2007
11:50 pm

Thanks for this, Hugh! I am the 'plant moderator' for www.promedmail.org, an information service by the International Society for Infectious Diseases. Since I ...
Dagmar Hanold
dagmar.hanold@adelaid...
Send Email
May 23, 2007
7:18 am

Dagmar Your ProMed-Mail seems very comprehensive and I hope other CICLY members will find it at http://tinyurl.com/2djc7d I agree that it would be a good idea...
Hugh Harries
hugh.harries
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May 24, 2007
8:35 am

Dagmar, Hugh, Cicly members who are doing research on some difficult problems like the lethal yellowings of coconut cannot spend their time in front of their ...
DOLLET Michel
michel.dollet@cirad.fr
Send Email
Jul 24, 2007
4:31 pm

Hello Michel, Thank you very much for this information, it is most interesting. Do you think it would be ok if I did a follow-up story posting your abstract...
Dagmar Hanold
dagmar.hanold@adelaid...
Send Email
Jul 25, 2007
8:52 am

... Cicly members who are doing research on some difficult problems like the lethal yellowing of coconut cannot spend their time in front of their computer... ...
Hugh Harries
hugh.harries
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Jul 26, 2007
12:55 pm

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