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Cyto embryological investigations on the polish representatives of the genus crataegus l. i. chromosome numbers embryology of diploid and tetraploid species



Cyto embryological investigations on the polish representatives of the genus crataegus l. i. chromosome numbers embryology of diploid and tetraploid species



Acta Biologica Cracoviensia Series Botanica 28: 107-122



Fox six Polish representatives of the genus Crataegus L. the following chromosome numbers were stated: Crataegus monogyna Jacq. 2n = 2x = 34, C. oxyacantha L. 2n = 2x = 34, C. curvisepala Lindm. 2n = 4x = 68, C. lindmanii Hrabet.-Uhr. 2n = 3x = 51, C. macrocarpa Hagetschw. 2n = 3x = 51 and C. palmstruchii Lindm. 2n = 3x = 48. The three last mentioned species have not been studied karologically up till now. The chromosome numbers indicate the occurrence of two basic chromosome numbers x = 17 and x = 16. The present paper deals with the embryology of di- and tetraploids. In diploid species C. monogyna and C. oxyacantha regular microsporogenesis follows in regular pollen grains. In tetraploid C. curvisepala, however, many disturbances in meiosis in PMCs leading to the formation of morphologically differentiated pollen grains were observed. In both diploid species macrosporogenesis and gametophytogenesis had a regular course. The reduced gametophytes are of the Polygonum type. An embryo and eudosperm developed after double fertilization. In the tetraploid C. curvisepala some disturbances in the development of female gametophytes were observed. The embryo and endosperm developed also after double fertilization.

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