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Variation in the onset of summer dormancy and flowering capacity of 16 populations of Poa bulbosa, collected along a steep north-south aridity gradient in Israel (810-110 mm rain year(-1)), was studied under controlled conditions in a phytotron (16 h daylength, 22/16 degrees C day/night) and under natural conditions in a garden experiment in a net-house. Plant age at the onset of dormancy varied markedly amongst populations (7-16 weeks under controlled conditions) and was positively correlated with mean annual precipitation at the site of origin of the population, i.e. dormancy was earlier as aridity increased. Flowering capacity in the different populations was negatively correlated with rainfall in the original habitat and, consequently, also with the age at onset of dormancy, i.e. the lower the mean annual precipitation, the earlier the onset of dormancy and the higher the proportion of flowering plants and panicles per plant. Differences in xeromorphic leaf traits were also observed among populations from locations differing in aridity. Plants from the more arid sites (110-310 mm year(-1)) generally had greyish and curved leaves, whereas plants from more humid sites (500-810 mm year(-1)) tended to have green and straight leaves. Thus, plants with curved and/or greyish leaves generally had a higher flowering capacity and entered dormancy earlier than plants with straight and/or green leaves. The significance of the association among these traits for the adaptation of P. bulbosa to increasing aridity is discussed.

Variation in Onset of Summer Dormancy and Flowering Capacity Along an Aridity Gradient in Poa bulbosa L., a Geophytic Perennial Grass