Data/hora: 06/06/2024 07:35:18

Biblioteca(s): 	Embrapa Trigo.	
Data corrente: 	10/01/2010	
Data da última atualização: 	26/01/2015	
Autoria: 	ALLAN, R. E.; VOGEL, O. A.	
Afiliação: 	1-2 Crops Res. Div., Wash. Agr. Exp. Sta., Pullman, Washington.	
Título: 	F1 monosomic analysis involving a smooth-awn durum wheat.	
Ano de publicação: 	1960	
Fonte/Imprenta: 	Wheat Information Service, n. 11, p. 3-4, 1960.	
ISSN: 	0510-3517	
Idioma: 	Inglês	
Conteúdo: 	Morphological examination of F1 plants, monosomic for chromosomes I to XIV and derived from crosses between the smooth-awned durum selection 396 and the Chinese series, did not reveal the chromosome or chromosomes possessing the recessive smooth-awn factor (or factors) of 396. Explanations for this failure are discussed. Awns or awnlets of F1 plants, monosomic for chromosomes of the A and B genomes except II and XIII, were barbed to the same degree as their respective disomic sibs. No awns were produced on plants monosomic for chromosomes II or XIII.

These two chromosomes were shown to carry recessive factors conditioning barbing of the keels of the outer glumes. Selection 396 carries the recessive alleles of Hd and B2; it also carries on chromosome V a recessive factor for awn development. Chinese Spring apparently has an awn-inhibiting factor, B, on chromosome XVI; this suppresses one or more of the awn-developing factors derived from 396. Culm waxiness was found to be controlled by a single dominant gene, Wx. This factor does not appear to be expressed in the hemizygous condition. Plants of the Wxwx genotype have a waxy phenotype whereas plants of Wx genotype, as well as wxwx plants, have waxless phenotypes. It is suggested that Wx provides two units of a precursor for waxiness while wx provides one unit, and that at least three units are required to bring about the waxy condition. It was noted that the date of anthesis was markedly late in plants monosomic for chromosome XIII; these plants flowered 11 days after their disomic sibs.

Smooth-awned tetraploid wheats were reported (19, 36, 496, 889) and genetic analyses (19, 36, 496) suggested a single recessive factor, with modifiers in most instances, relative to rough awns. The phenotype has not been reported in hexaploid wheats. No gene symbol has been applied.
19   Allan R.E and Vogel O.A. (1960) F1 monosomic analysis involving a smooth-awn durum wheat. Wheat Information Service 11:3-4.
496 Knowles P. F. and Harrington J. B. (1943) Breeding smooth-awned durum and vulgare wheats. Scientific Agriculture 23:697-707.
889 PBA-21-831 Plant Breeding Abstracts 21:831.
36  PBA-39-471 Plant Breeding Abstracts 39:471.	
Thesagro: 	Trigo Duro.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Trigo (CNPT)	
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