Thiophene accumulation in relation to morphology in roots of Tagetes patula : Effects of auxin and transformation by Agrobacterium
Croes, A.F.; van den Berg, A.J.; Bosveld, M.; Breteler, H.; Wullems, G.J.
Planta 179(1): 43-50
1989
ISSN/ISBN: 0032-0935 PMID: 24201420 DOI: 10.2307/23379824
Accession: 007948666
Roots of marigold (Tagetes patula L.) accumulate thiophenes, heterocyclic sulfurous compounds with strong biocidal activity. In detached roots cultured in vitro, the thiophene content was 5 .mu.mol .cntdot. (g fresh weight)-1 which is 25-times higher than in roots attached to the plant. In roots derived from tissues transformed by Agrobacterium tumefaciens and A. rhizogenes, the morphology and thiophene content varied with the bacterial strain used. Transformation stimulated the elongation of the root tips and the formation of lateral roots but lowered the thiophene level to 20-50% relative to the concentration in untransformed detached roots. A negative correlation was found between the number of laterals in a root system and the thiophene content. Extensive branching and a decrease in thiophene accumulation was evoked in untransformed roots by indole-3-acetic acid (1-10 .mu.mol .cntdot. l-1) added to the medium. Within the roots, the highest thiophene concentrations were found in the tips. The results indicate that auxin directly or indirectly plays a role in the regulation of the thiophene level in root tips.