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From: rao ks <kayesrao@yahoo.com>
Subject: letter
Date: Mon, 14 Oct 2002 09:58:54 -0700 (PDT)

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Dear Members,

I add this comment with reference to the the pits on
the radial walls of tracheids.   We know the fusifrom
cambial cells are characterised by the presence of
numerous  primary pits on their radial walls.Many of
these are known to develop into pits while
differentiating into xylem elements, I could not
notice any primary pits on the tangential walls of the
cells even when I observed the cells under EM.Same may
be the case with conifer cambial cells though I have
not studied it. Therefore the distribution of pits on
the raidial wall of tracheids may be ontgenitically
related to the radial  wall primary pits of fusiform
cambial cells.

The discussion on intercellular spaces among ray cells
is also interesting. we could notice these spaces
among ray initials, phloem rays and xylem rays only
during dormant condition.I feel that this condition
may be common in many species which are exposed to dry
and wet conditions alternately.  we published a paper
on this aspect: Occurrence of intercellular spaces in
cambial rays. Israel Journal of Botany 46: 299-302,
1998. I guess that the lenticels on the bark surface
may directly or indirectly open into the ray system,
but one has to look in to this aspect. 


K. S. Rao
Professor in Botany
Dept.of Biosciences
Sardar Patel Univesity
Vallabh vidyanagar-388 120
Gujarat, India

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