EFFECT OF WATERLOGGING ON GROWTH AND ISOFLAVONE CONCENTRATION OF TRIFOLIUM SUBTERRANEUM L

Seventy-five cultivars were used to determine the effect of waterlogging on the yield and isoflavone content of three subspecies of Trifolium subterraneum L. The 21-day flooding treatment affected root growth more than shoot growth. The relative tolerance of the subspecies to waterlogging was yanninicum > subterraneum > brachycalycinum. These results were in keeping with ecological evidence. The flooding treatment resulted in a general increase in leaf isoflavone concentra tions. As with plant growth there was a significant subspecies x waterlogging inter action, the relative increase in isoflavone concentration being least for subsp. yanninicum. © 1969 CSIRO. All rights reserved.