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- Title
Anaerobic promotion of stem extension in Potamogeton pectinatus. Roles for carbon dioxide, acidification and hormones.
- Authors
Summers, Jacky E.; Jackson, Michael B.
- Abstract
Dark-gown shoots of tubers of the aquatic monocot Potamogeton pectinatus L elongated more strongly in anaerobic than aerobic solutions over 5 days. The response was located in the stem rather than the leaf Anaerobic carbon dioxide (CO2) production was similar to that in aerobic conditions. Approximately half the anaerobic stem extension was attributed to acidification of the submerging medium by respiratory CO2. Sparging with an anaerobic gas mixture of nitrogen and hydrogen to remove dissolved CO2 inhibited stem elongation and prevented acidification of the medium. Similarly supplying CO2 anaerobically promoted stem elongation while acidifying the medium Carbon dioxide was also active on aerobic shoots. The effect of CO2 on anaerobic stem extension could be mimicked with an acidic buffer. Anaerobic stem extension was inhibited by exogenous abscisic acid (ABA), while gibberellic acid and the gabberellin-biosynthesis inhibitor pacIobutrazol proved inactive. Exogenous indoIe-3-acetic acid promoted stem extension in the absence of oxygen. A strong gravitropic response by anaerobic stems of P. pectinatus was inhibited by the auxin-efflux inhibitor naphthylphthalamic acid.
- Subjects
POTAMOGETON; SAGO pondweed; CARBON dioxide; FATTY acids; HYDROGEN; OXYGEN
- Publication
Physiologia Plantarum, 1996, Vol 96, Issue 4, p615
- ISSN
0031-9317
- Publication type
Article
- DOI
10.1111/j.1399-3054.1996.tb00234.x