Production and cytogenetics of Triticum aestivum L. hybrids with some rhizomatous Agropyron species

Abstract

Intergeneric hybrids between Triticum aestivum L. and conventional rhizomatous Agropyron species were produced in variable frequencies. They were recovered in high percentage frequencies for T. aestivum cultivars with A. acutum (14.6%), A. intermedium (48.0%), A. pulcherrimum (53.3%), and A. trichophorum (46.6%). The crossability percentages with the highly crossable cultivar 'Chinese Spring' for these Agropyron species accessions were 33.12%, 65.0%, 53.3%, and 65.4%, respectively. Autosyndetic associations of two of their three genomes gave mean meiotic chromosome association data of 17.0 I (univalents) +1.53 II (ring bivalents) + 7.04 II (rod bivalents) +1.43 III (trivalents) +0.05 IV (quadrivalents) +0.01 IV (pentavalents) for A. acutum and of 21.8 I + 1.56 II (rings) +7.22 II (rods) +0.84 III + 0.04 IV for A. intermedium. Chromosome pairing at metaphase I was comparatively lower for A. pulcherrimum (34.4 I + 0.2 II (rings) +3.4 II (rods) +0.14 III) and A. trichophorum (36.7 I + 0.35 II (rings) +2.26 II (rods) + 0.04 III) hybrids with T. aestivum. Hybrids of wheat with A. campestre and A. repens were obtained in low frequency. Direct crossing did not permit T. aestivum/ A. desertorum hybridization. However, by utilizing the 2n=10x=70 A. repens/A. desertorum amphiploid as the pollen source, hybridization with T. aestivum did indeed occur. Aneuploidy was prevalent in this hybrid combination while all other hybrid combinations were apparently normal.

Wheat × Thinopyrum Hybrids

“…Subsequent to their cytogenetic study in 1987 of the hybrids between wheat and the caespitose species of Thinopyrum, Mujeeb-Kazi et al (1989) also investigated the cytogenetics of the hybrids between wheat and the rhizomatous wheat grasses. The hybrid between Triticum aestivum cv.…”

Enhanced meiotic chromosome pairing in intergeneric hybrids between Triticum aestivum and diploid Inner Mongolian Agropyron

“…Agropyron has been confirmed in experiments by some authors (White 1940;Smith 1943;Mujeeb-Kazi 1989). Success in such crosses was achieved only recently: hexaploid wheat has been reported to be successfully crossed with tetraploid Agropyron species [A. cristatum, A. michnoi, A. desertorum, andA.…”

How wide can a wide cross be?

“…curvifolium (J1J1J2J2) (Mujeeb-Kazi et al ., 1987) ; Th . junceiforme (JJEE) (Mujeeb-Kazi et al ., 1989) ; Th. nodosum (EESS) (Jauhar, 1990) ; Th.…”

“…First Triticum-Leymus hybrid involved Leymus arenarius (J1J1J2J2N1N1N2N2) (Petrova, 1960) . Eight species of this genus have now been hybridized with wheat (Mujeeb-Kazi et al ., 1989 ;Plourde et al, 1989aPlourde et al, , 1989bPlourde et al ., 1992). Smith (1942) was unsuccessful in crossing El .…”