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- Title
Soil Water Extraction, Measured by Computer-Assisted Tomography, in Seedling Lupinus angustifolius cv. Yandee when Healthy and Infected with Phytophthora cinnamomi.
- Authors
GROSE, M. J.; HAINSWORTH, J. M.
- Abstract
The water-mould fungus Rands causes drought-like symptoms on many hosts, and yet the mechanisms by which infection leads to wilting are not fully understood. This is the first study to describe in detail changes in soil water around the root with infection. Computer-assisted tomography (CAT) was used with L. cv. Yandee to examine drawdowns (removal of soil water) around a central root infected by P. cinnamomi in a white sand. No growth differences in roots or shoots were found between healthy and diseased plants during the 8 d of the experiment.However, drawdowns failed at high levels of inoculum (8–16 /-infected millet seeds/plant) by 8 d. Water contents in pots with uninfected plants were in the range 0·09–0·12 cm water cm soil in the centre of the pot, while water contents in pots with infected plants at 16 millet seeds applied were in the range of 0·16–0·19 cm water cm soil in the centre of the pot. A higher transpirational demand produced lower soil water contents near the root but this effect was confounded with infection: disease was more pronounced with higher transpirational demand, and disease led to an increase in water content.
- Publication
Journal of Experimental Botany, 1992, Vol 43, Issue 1, p121
- ISSN
0022-0957
- Publication type
Article
- DOI
10.1093/jxb/43.1.121