The Effect of Different Water Regimes on Growth and Nodule Development of Greenhouse-GrownVicia faba

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Abstract
Plants of Vicia faba cv. Maris Bead were germinated under uniform conditions; some were then transferred to conditions of water excess or stress for the vegetative growth phase. Those on the excess water regime grew best, produced most root nodules, and fixed most nitrogen. Microscopic examination showed that control and water-stressed plants did not develop all those nodules which had previously been initiated. Average nodule weight and specific activity were unaffected, but nodules showed a progressive increase in size and a more open structure as water supply was increased. Transfer between treatments resulted in adaptation to the new environment within a few days. It is concluded that established plants of V. faba are far more likely to be adversely affected by water stress than by excess water.