caa a22 4500 477039405 CHVBK 20180405111313.0 cr unu---uuuuu 170330e19960301xx s 000 0 eng 10.1007/BF00989053 doi (NATIONALLICENCE)springer-10.1007/BF00989053 Chichiriccò G. Dipartimento di Scienze Ambientali, Università di L'Aquila, Via Vetoio, I-67100, L'Aquila, Italy aut Intra- and interspecific reproductive barriers in Crocus ( Iridaceae ) [Elektronische Daten] [G. Chichiriccò] The reproductive system was studied inCrocus genus (Iridaceae) following intra- and interspecific pollination, by using light and scanning electron microscopy. The results suggest that the stigma-style tract of theCrocus pistil is a mere promoter of pollen tube growth, while intra- and interspecific discrimination of compatible and incompatible pollen occurs in the ovarian tract. Here, the transmitting tissue consists of special epidermal cells, whose granular or floccular secretions provide the selective medium for the growth of pollen tubes. The ovarian self-incompatibility (SI) is widespread within the genus, resulting in a partial or complete suppression of self-fertilization. Moreover, postzygotic SI mechanisms, as well as postzygotic mechanisms of unknown nature, seem to be recurrent and both are responsible for seed abortion. The interspecific ovarian incompatibility concerns only unrelated crosses; crosses between related fertile species succeed both in fertilization and seed-set. Springer-Verlag, 1996 Iridaceae nationallicence Crocus nationallicence Pistil transmitting tract nationallicence intra-interspecific pollination nationallicence pregamic-postgamic barriers nationallicence Plant Systematics and Evolution Springer-Verlag 201/1-4(1996-03-01), 83-92 0378-2697 201:1-4<83 1996 201 606 https://doi.org/10.1007/BF00989053 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00989053 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Chichiriccò G. Dipartimento di Scienze Ambientali, Università di L'Aquila, Via Vetoio, I-67100, L'Aquila, Italy aut NATIONALLICENCE 773 0- Plant Systematics and Evolution Springer-Verlag 201/1-4(1996-03-01), 83-92 0378-2697 201:1-4<83 1996 201 606 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer