Inversions and Other Characteristics of Teosinte Chromosomes

Intergenomic Mapping of Maize, Teosinte and Tripsacum

“…For the loci tested, the hybrids have essentially the same frequencies of crossing over as in maize (Emerson and Beadle, 1932) except when chromosome 9 is heterozygous for an inversion that was postulated by Beadle ( 1932b) and demonstrated cytologically by O'Mara (1942). Other in-versions separating maize and certain teosintes are known (Ting, 1958(Ting, , 1964 but their possible role in the origin of maize and/or certain teosintes is unknown. The cytogenetic analysis of maize-teosinte hybrids led Beadle (1939) to propose that teosinte is the ancestor of maize and "that these major differences arose by mutation, either genetic or chromosomal in nature and were preserved by man through deliberate selection."…”

Cytological Studies on an Inversion in Barley

“…In plants, bridge and fragment configurations, formed by crossing over between homologous segments in structurally dissimilar chromosomes, were detected in Aesculus (UPCOTT, 1936), Agave (DOUGHTY, 1936), erepis ( M U N T Z I N G , 19341, Cyrfnnthus ( ISING, 1966), Fritillarici (FRANKEL, 1937), Lilium (RICHARDSON, 1937), Lolium (JENKIN and THOMAS, 1937), Nicoticina (MUNTZING, 1935), Paeoniri (SAX, 1937;MARQUARDT, 1952), Secnle (MUNTZING and PRAKKEN, 1941), Trcidesccintia (SWANSON, 1940), Trillium (SMITH, 1935), Tulipci (UPCOTT, 1937) and Zeti (MCCLINTOCK, 1931;MORGAN, 1950;TING, 1958TING, , 1965. Most of the writers cited attribute the appearance of bridge and fragment configurations to inversion heterozygosity.…”

“…Some writers, however, do not specify the kind of structural dissimilarity which leads to the formation of bridge and fragment configurations. In plants, positions of inversion were only located in Zecc (MORGAN, 1950;TING, 1958TING, , 1965.…”

QTL mapping of root aerenchyma formation in seedlings of a maize × rare teosinte “Zea nicaraguensis” cross

“…Iltis, (2) Z. mays ssp. parviglumis Iltis & Doebley, and (3) perennis, the teosintes possess the same diploid chromosome number as maize (2n = 2x = 20) and their chromosomes are known to generally pair and recombine with the chromosomes of maize (Molina and Naranjo 1987;Ting 1958). Historically, maize £ teosinte hybridizations have provided germplasm for heat and drought tolerance (Reeves 1950), aluminum tolerance (Barcelo et al 1993) and grain yield production (Cohen and Galinat 1984).…”