Genome Relationships in Some Species of Tripsacum
The genus Tripsacum has been of special interest to students of evolution, in the Maydeae since the demonstration by Mangelsdorf and Reeves (1931) that certain members of this genus could be hybridized successfully with maize. However, cytological relationships within the genus or with. Zea and Euchlaena have remained largely a matter of speculation. Cutler and Anderson (1941) suggested that the various entities within the genus Tripsacum might be quite intricate, and proposed that through
... tigations of the morphology and cytology of this genus should be made in orderr to clarify the relationships involved. To date, few such studies have been reported. Maguire (1957, 1960) has shown that it is possible for chromatin transfer to occur from Tripsacum dactyloides to maize, but her studies have emphasized that such transfer occurs only rarely on a scale detectable by normal cyto logical methods. Shaver (1962) has made it clear that nearly complete chromosome homology exists between tetraploid maize and tetraploid peren nial teosinte (Euchlaena perennis). However, the genome constitution of the various species of Tripsacum has not been analyzed, nor have genome relationships between Tripsacum and the other genera of the Maydeae been clearly established. The studies reported in this paper were undertaken to provide basic information for the development of a large-scale program of intergeneric hybridization of Tripsacum species with maize and teosinte. The first objective of these studies was to establish the genome constitution of widely -varying stocks of Tripsacum, and the cytological relationships between Tripsacum and maize.