[VIPS] Ideotype question (fwd)

'Toby' H D Bradshaw toby at u.washington.edu
Thu Oct 12 13:51:24 EST 1995


Forwarded from Paul Heilman, Washington State University

-Toby Bradshaw
toby at u.washington.edu

---------- Forwarded message ----------
Date: Fri, 6 Oct 1995 17:35:36 -0700
From: Paul Heilman <heilman at coopext.cahe.wsu.edu>

It seems to me that the danger in the ideatype approach is that it can be
entirely too simplistic.

Since high production depends on the crowding together of trees that are
simply efficient at using their allotted space throughout their lifetimes
(untill harvest),  much more is involved than:

Juvenile branching advantages.  Syleptics do give early advantages but not
so much as to be a key to high production. 

Crown characteristics.  Support of the tree and other root system functions
with minimum allocation of carbon to roots must be important to high
production. >
Same for behavior in stool beds, rooting from cuttings with high survival in
plantations,  high harvest index for bole wood( w/o bark), disease and
insect resistance, wood quality, tolerance to adverse site conditions,
resistance to animal damage, etc
For other than biomass and pulp, it is important to have straight boles with
minimal taper.

Now if we can make some real progress on those features, maybe we can afford
the luxury of crown ideatype breeding.

Paul Heilman







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