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Cyto embryological investigations on the polish representatives of the genus crataegus l. ii. embryology of triploids species



Cyto embryological investigations on the polish representatives of the genus crataegus l. ii. embryology of triploids species



Acta Biologica Cracoviensia Series Botanica 31: 97-112



In three triploid species (2n = 48) C. palmstruchii Lindm.; (2n = 51) C. lindmanii Hrabet.-Uhr. and C. macrocarpa Hagetschw. highly disturbed microsporogenesis gives origin to pollen grains morphologically and karyologically differentiated; giant pollen grains are present. In ovules frequent is abortion of elements representing meiotic line and occurrence of nucellaraposporic initials (AI) in number 1 to 5. In many ovules 2 or more (up to 8) ESs occur, confirming the formation of asposporic embryo sacs (AESs).

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