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PLANT PHYSIOLOGY , Vol 114, Issue 4 1207-1214, Copyright © 1997 by American Society of Plant Biologists
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WHOLE PLANT, ENVIRONMENTAL, AND STRESS PHYSIOLOGY |
Al Inhibits Both Shoot Development and Root Growth in als3, an Al-Sensitive Arabidopsis Mutant
P. B. Larsen, L. V. Kochian and S. H. Howell
Boyce Thompson Institute, Tower Road, Cornell University, Ithaca, New York 14853 (P.B.L., S.H.H.)
In als3, an Al-sensitive Arabidopsis mutant, shoot development and root
growth are sensitive to Al. Mutant als3 seedlings grown in an Al-containing
medium exhibit severely inhibited leaf expansion and root growth. In the
presence of Al, unexpanded leaves accumulate callose, an indicator of Al
damage in roots. The possibility that the inhibition of shoot development
in als3 is due to the hyperaccumulation of Al in this tissue was examined.
However, it was found that the levels of Al that accumulated in shoots of
als3 are not different from the wild type. The inhibition of shoot
development in als3 is not a consequence of nonspecific damage to roots,
because other metals (e.g. LaCl3 or CuSO4) that strongly inhibit root
growth did not block shoot development in als3 seedlings. Al did not block
leaf development in excised als3 shoots grown in an Al-containing medium,
demonstrating that the Al-induced damage in als3 shoots was dependent on
the presence of roots. This suggests that Al inhibition of als3 shoot
development may be a delocalized response to Al-induced stresses in roots
following Al exposure.
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