Owen Atkin said:
>> Dear Tony,
>> Thanks for your reply concerning my inquiry about the aphid/alpine-arctic
I hope you don't mind if I post a reply here Owen: you've raised an
issue that may be interesting to discuss further on bionet.plants.
> question. Your suggestion that the aphids may be predating the thinner alpine
> leaves because of easier access to the phloem is a good one - only
> problem is that the aphids actually infested the thicker leaves of the
> arctic ecotypes, rather than the leaves of the alpine. I may have made a
> mistake in the message I sent out to bionet.plants.
Maybe the phloem is nearer the surface or more easily accessible in the
> In a few weeks I will look more closely at the internal leaf anatomy of the
> leaves (with Dr Nancy Dengler). This may give some indication as to
> whether the leaves differ iways that may help resist aphids
We've just written a couple of papers (in press) about the use of image
analysis to measure cell wall thickness and other anatomical features
Travis, A.J., Murison, S.D. & Chesson, A. (1993). Estimation of plant
cell wall thickness and cell size by image skeletonization, Journal
of Agricultural Science, Cambridge, 120, xx-xx.
Travis, A.J., Murison, S.D., Chesson,A. & Walker, K.C. (1993).
Quantitative measurement of stem anatomy as an indicator of
varietal performance. Aspects of Applied Biology, Physiology of
Varieties, 34, xx-xx.
Perhaps it would be interesting to compare your leaves using a similar
Dr. A.J.Travis, | Tony Travis
Rowett Research Institute, | JANET: <ajt at uk.ac.sari.rri>
Greenburn Road, Bucksburn, | other: <ajt at rri.sari.ac.uk>
Aberdeen, AB2 9SB. UK. | phone: 0224-712751