The Cycad Bulletin Board: Re: Premature hardening of new leaves

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Re: Premature hardening of new leaves

Posted by Richard Corlett on 9/29/2009, 2:38 am, in reply to "Re: Premature hardening of new leaves"
195.229.237.39

Thanks for your comments.

I have noticed that the problem is mainly affecting older seedlings that have shed their seeds some time ago and already have three or more leaves. They are mostly Dioon edule and Cycas media.

The new seedlings that have pushed up their first leaves during the height of the summer have produced healthy leaves of good size. Those are Cycas Cairnsiana, Cycas angulata and a couple of Macrozamia communis.

By the way I have an older plant of Cycas revoluta that similarly produced several flushes of undersized prematurely hardened leaves, but at the start of the summer pushed out a flush of good full-sized leaves.

I think it bears out your comment that there may be a combination of factors involved.

I would be very interested to hear your suggestions of the cycad species that you have found to have the best heat tolerance.

--Previous Message--
:
:
: --Previous Message--
: Several of the leaves pushed up by
: my
: cycad seedlings have hardened off
: before they are fully unfolded. My
: assumption was that this is caused
: by high summer temperatures
: (>110° F) but there doesn't seem
: to be consistency even within
: seedlings of the same species.
: Would temperature be the most likely
: cause or might it be something else?
: I would appreciate your advice.
:
: It is most likely stress or lack
: of energey, but it doesn't mean it
: was just from the heat alone. Each
: seed is feeding the seedling to be.
: If the connection isn't the best, if
: the endosperm is not as full, if
: there is any damage at all to the
: seed, these short first leaves can
: happen. It might just be the heat
: and the amount of water the
: seedlings are getting while the new
: leaves are being pushed out. Since
: they do better when they get extra
: water while pushing leaves, this is
: also another possibility. All can be
: a reason and there might be
: different reasons for some of those
: seedlings and other reasons for a
: few of the others. You really can't
: assume anything for 100%.
:

Message Thread:

Premature hardening of new leaves - Richard Corlett 9/28/2009, 6:03 am
- Re: Premature hardening of new leaves - Tom Broome 9/28/2009, 1:46 pm
  - Re: Premature hardening of new leaves - Richard Corlett 9/29/2009, 2:38 am
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--Previous Message-- : Thanks for your comments. : : I have noticed that the problem is : mainly affecting older seedlings : that have shed their seeds some time : ago and already have three or more : leaves. They are mostly Dioon : edule and Cycas media . : : The new seedlings that have pushed : up their first leaves during the : height of the summer have produced : healthy leaves of good size. Those : are Cycas Cairnsiana , Cycas : angulata and a couple of : Macrozamia communis . : : By the way I have an older plant of : Cycas revoluta that similarly : produced several flushes of : undersized prematurely hardened : leaves, but at the start of the : summer pushed out a flush of good : full-sized leaves. : : I think it bears out your comment : that there may be a combination of : factors involved. : : I would be very interested to hear : your suggestions of the cycad : species that you have found to have : the best heat tolerance. : : --Previous Message-- : : : --Previous Message-- : Several of the leaves pushed up by : my : cycad seedlings have hardened off : before they are fully unfolded. My : assumption was that this is caused : by high summer temperatures : (>110° F) but there doesn't seem : to be consistency even within : seedlings of the same species. : Would temperature be the most likely : cause or might it be something else? : I would appreciate your advice. : : It is most likely stress or lack : of energey, but it doesn't mean it : was just from the heat alone. Each : seed is feeding the seedling to be. : If the connection isn't the best, if : the endosperm is not as full, if : there is any damage at all to the : seed, these short first leaves can : happen. It might just be the heat : and the amount of water the : seedlings are getting while the new : leaves are being pushed out. Since : they do better when they get extra : water while pushing leaves, this is : also another possibility. All can be : a reason and there might be : different reasons for some of those : seedlings and other reasons for a : few of the others. You really can't : assume anything for 100%. : : :

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