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Ecological features of Ambrosia artemisiifolia L. flowers and characteristics of Ambrosia L. pollen seasons in the condition of Lublin (Poland) in the years 2001-2008

100%

Weryszko-Chmielewska E., Piotrowska K.

Acta Agrobotanica

2008

tom 61

nr 2

In the study, the biology of fl owering of Ambrosia artemisiifolia L. was investigated and the pattern of the Ambrosia pollen seasons in Lublin in the years 2001-2008 was characterised. The structure of male and female A. artemisiifolia fl owers was observed in cultivated plants under controlled conditions in the 2000 vegetative season. The number of pollen grains produced by the stamen, fl ower, infl orescence and plant was determined. It was shown that in A. artemisiifolia fl owers nonfunctional pistils occurred with a reduced ovary, performing the role of a pollen presenter. The pistils found in female fl owers differed signifi cantly in their morphological features from the pistils in male fl owers. It was calculated that one stamrn produced an average of 3 375 pollen grains, whereas one fl ower 16 875. A plant which produces 20 racemes may release over 420 million pollen grains into the atmosphere. The Ambrosia pollen seasons in particular years had different patterns. In some years, the days of maximum concentration were in the second half of August, in other years in the fi rst half of September. Over the 8-year period, the maximum daily concentration had a mean value of 116 pollen grains in m3 (31-311). Annual total concentrations of Ambrosia pollen grains ranged between 194 and 1200 grains, and it was 523 grains on the average. The pollen seasons were characterised by the occurrence of several-day-long interruptions in the presence of airborne pollen in the atmosphere of Lublin, which may indicate the long-distance transport of Ambrosia pollen.

Ograniczanie wyników

1 Acta Agrobotanica

1 Piotrowska K.

1 Weryszko-Chmielewska E.

1 2008

Wyniki wyszukiwania

Ecological features of Ambrosia artemisiifolia L. flowers and characteristics of Ambrosia L. pollen seasons in the condition of Lublin (Poland) in the years 2001-2008