2ND-GENERATION EXPERIMENTAL HYBRIDIZATIONS IN THE ECHINOCEREUS X LLOYDII COMPLEX (CACTACEAE), AND FURTHER DOCUMENTATION OF DIOECY IN E-COCCINEUS

Authors
Citation
Am. Powell, 2ND-GENERATION EXPERIMENTAL HYBRIDIZATIONS IN THE ECHINOCEREUS X LLOYDII COMPLEX (CACTACEAE), AND FURTHER DOCUMENTATION OF DIOECY IN E-COCCINEUS, Plant systematics and evolution, 196(1-2), 1995, pp. 63-74
Citations number
11
Categorie Soggetti
Plant Sciences
ISSN journal
03782697
Volume
196
Issue
1-2
Year of publication
1995
Pages
63 - 74
Database
ISI
SICI code
0378-2697(1995)196:1-2<63:2EHITE>2.0.ZU;2-B
Abstract
Artificial second generation and backcross hybrids involving Echinocer eus dasyacanthus (Texas rainbow cactus), E. coccineus (a species of cl aret-cup cactus), and E. X lloydii (Lloyd's hedgehog cactus) were exam ined for morphological and reproductive characteristics. The hybrids g rew from seed to flower in about four years, and they exhibited high f ertility as measured by pollen stainability, crossability, and fruit-s et. A rare breeding system in Cactaceae, dioecy, was further examined in E. coccineus, using field and controlled pollination tests. Functio nal dioecy was documented for E. coccineus in Trans-Pecos Texas. Al re sults suggested that E. X lloydii in eastern Pecos County, Texas, is a complex and dynamic population probably comprising first and later ge neration hybrids, including backcross hybrids. The experimental hybrid izations also tended to support the occurrence of introgression into b oth putative parental species.