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Table 9.1 Classifi cation of Aegilops sp ecies accor ding to van Slageren ( 1994 )

Section and Species Ploidy Genome

Section Aegilops L.

Aegilops biuncialis Vis. 4× U b M b

Aegilops columnaris Zhuk. 4× U c M c

Aegilops geniculata Roth 4× M g U g

Aegilops kotschyi Boiss. 4× S k U k

Aegilops neglecta Req. ex Bertol. 4×, 6× U n M n , U n M n N n

Aegilops peregrina (Hackel in J. Fraser) Maire & Weiller 4× S p U p

var. peregrina

var. brachyathera (Boiss.) Maire & Weiller

Aegilops triuncialis (L.) Á. Löve 4× C t U t

var. triuncialis

var. persica (Boiss.) Eig

Aegilops umbellulata Zhuk. 2× U

Section Comopyrum (Jaub. & Spach) Zhuk

Aegilops comosa Sm. in Sibth. & Sm. 2× M

var. comosa

var. subventricosa Boiss.

Aegilops uniaristata Vis. 2× N

Section Cylindropyrum (Jaub. & Spach) Zhuk.

Aegilops markgrafi i (Greuter) Hammer 2× C

Aegilops cylindrica Host 4× C c D c

Section Sitopsis (Jaub. & Spach) Zhuk.

Aegilops bicornis (Forsskål) Jaub. & Spach 2× S b

var. bicornis

var. anathera Eig

Aegilops longissima (Schweinf. & Muschl. in Muschl.) Eig 2× S l

Aegilops searsii Feldman & Kislev ex K. Hammer 2× S s

Aegilops sharonensis Eig 2× S sh

Aegilops speltoides Tausch 2× S

var. speltoides

var. ligustica (Savig.) Fiori

Section Vertebrata Zhuk. emend. Kihara

Aegilops crassa Boiss. 4×, 6× D c M c , D c D c M c

Aegilops juvenalis (Thell). Eig 6× D j M j U j

Aegilops tauschii Cosson 2× D

Aegilops vavilovii (Zhuk.) Chennav. 6× D v M v S v

Aegilops ventricosa Tausch 4× D v N v

9.2 Early History

Aegilops species are ex cellent sources of resistance to many biotic (e.g., rusts, pow-
dery mildew, cereal cyst nematode, root-knot nematode, Hessian fl y, and greenbug)
and abiotic (drought, cold, heat, and salinity) stresses (Sharma and Gill 1983 ;

P. Zhang et al.