TY - JOUR
AU - BLOM, C W P, M
AB - Abstract Plants of Rumex thyrsiflorus Fingerh., R. crispus L. and R. maritimus L., which are zoned along a gradient of elevation in a river foreland ecosystem, and differ in their flood-tolerance, were subjected to different flooding levels. Under conditions of soil flooding, the growth rates of the flood-tolerant R. crispus and R. maritimus were as high as under drained conditions, but that of the flood-intolerant R. thyrsiflorus was halved. Upon submergence, the low elevation species R. maritimus showed rapid shoot elongation; when elongation resulted in a protrusion of leaves above the water surface, the plants survived. Alternatively, underwater photosynthesis also led to a 100% survival of submerged R. maritimus plants, provided that enough inorganic carbon was made available in the water. This could be attributed in part to the use of photosynthetically-derived oxygen for root respiration; in a hydroculture experiment, with 5.0 mM CO2 in the water in the shoot environment, photosynthetically-derived oxygen contributed more than 50% to root oxygen consumption at low oxygen concentrations in the root environment. The intermediately elevated species R. crispus appeared to be much more tolerant towards conditions of prolonged total submergence: older plants survived eight weeks submergence in the dark. This response was explicable in terms of a dormancy-strategy, which is characterized by a slow consumption of carbohydrates stored in the tap-root. The differential responses of R. maritimus and R. crispus to total submergence reveal the limitations of flood-tolerance and reflect the different life-histories of the species. Photosynthesis, Rumex, submergence, carbohydrates, growth rate, shoot elongation This content is only available as a PDF. © Oxford University Press
TI - Growth and Survival Responses of Rumex Species to Flooded and Submerged Conditions: The Importance of Shoot Elongation, Underwater Photosynthesis and Reserve Carbohydrates
JF - Journal of Experimental Botany
DO - 10.1093/jxb/41.7.775
DA - 1990-07-01
UR - https://www.deepdyve.com/lp/oxford-university-press/growth-and-survival-responses-of-rumex-species-to-flooded-and-qAI8lCkPyV
SP - 775
EP - 783
VL - 41
IS - 7
DP - DeepDyve
ER -