Assessment of pollen grains state in tidal zone plants of White Sea coast

The state of pollen grains in three halophytes species Tripolium pannonicum (Jacg.) Dobrocz. subsp. tripolium (L.) Greuter, Triglochin maritima L., Glaux maritima L., growing on the coastal tidal zone of the White Sea was studied. On three testing plots of tidal flat zone close to the low-water line and in the area of emissions, the samplings of inflorescent plants were studied. Due to our data, the percentage of imperfect pollen grains in Tripolium pannonicum is equal to 5,0-15,0 %, in Glaux maritima to - 6,030,0 %, in Triglochin maritima to - 18,0-42,0 %. The defects in the structure of the pollen grains are typical for all investigated species growing on the plots. However, the smallest amount of imperfect pollen grains was observed in Tripolium pannonicum and Triglochin maritima by the low-water line, and in Glaux maritima - by the seashore. These data point out to their ability to bear different duration of flooding. Assessments of various amount of normal pollen revealed different levels of adaptation in the studied plants to tidal conditions. These species are arranged according to the degree of their adaptive potential to the level of reproduction: Tripolium pannonicum, Glaux maritima, Triglochin maritima.