COMPARATIVE STUDIES OF PLANT GROWTH AND DISTRIBUTION IN RELATION TO WATERLOGGING

Publisher Website
Google Scholar
Abstract
Summary: Rooted cuttings of Salix caprea and of S. cinerea ssp. oleifolia were supplied with 0 to 320 mg Fe2+ dm3 as sulphate dissolved in nutrient solution either at a constant concentration or supplied incrementally. Photosynthesis and respiration of the treated plants was monitored by infrared gas analysis for periods of 4 to 7 d.Control shoots, in air‐bubbled or nitrogen‐bubbled solutions, maintained constant rates of photosynthesis and dark respiration during the experimental period. S. cinerea was unaffected by a constant concentration of 160 mg Fe2+dm3 or incremental additions reaching 320 mg Fe2+ dm−3. S. caprea was unaffected by 10 mg Fe2+ dm3, but a constant concentration of 40 mg Fe2+ dm3 or incremental additions reaching 40 mg Fe2+ dm3 caused almost total inhibition of photosynthesis and considerable reduction of respiration.Repeating these experiments using cuttings with excised roots increased the sensitivity of both species so that, even in S. cinerea, 10 mg Fe2+ dm3 was inhibitory to photosynthesis.