Abstract
AbstractPhaseolus vulgaris ‘Saxa’ was cultivated in quartz sand under natural light conditions in an open‐top‐chamber and supplied with either complete (1.3 mM Mg) or magnesium‐free nutrient solution. 57 days old plants showed interveinal chloroses of older leaves, decreased magnesium and increased potassium tissue concentrations in leaves and pods.Plants with magnesium supply exhibited typical diurnal changes of hexoses, sucrose and starch in trifoliate leaves. Magnesium deficiency caused retarded sucrose formation and pronounced starch accumulation in trifoliate leaves throughout the day.Soluble sugars and starch were decreased in pods of plants without Mg‐supply.The results are discussed with regard to diurnal changes of carbohydrate metabolism.
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