Genetic control of the rate of transmission of rye B chromosomes. I. Effects in 2B × 0B crosses

Romera, F; Jiménez, M M; Puertas, M. J.

doi:10.1038/hdy.1991.8

Cited by 38 publications

(30 citation statements)

References 14 publications

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“…In either case, this directed migration may simply be a passive process; the spindle may often be asymmetrical causing Bs to end up at the generative pole simply by chance (e.g. M. maculatus, Hewitt, 1976 (Shaw & Hewitt, 1985), P. affinis (Nur & Brett, 1988) and rye (Romera et al, 1991). Other control factors could be maternal effects (e.g.…”

Section: Best Conditions?mentioning

confidence: 99%

Bewildering Bs: an impression of the 1st B-Chromosome Conference

1994

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Section: Best Conditions?mentioning

confidence: 99%

Bewildering Bs: an impression of the 1st B-Chromosome Conference

1994

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“…Furthermore, the variation in such genotypes was reported in Ae. speltoides (CEBRIA et al 1994) and rye (ROMERA et al 1991;JIMENEZ et al 1995). Ae.…”

Section: Heterogeneity In B Jrequency Among Populationsmentioning

confidence: 99%

Geographical Distribution of B Chromosomes in Aegilops Mutica Boiss., A Wild Relative of Wheat

Ohta

Saruhashi

2004

Hereditas

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The morphology and frequency of B chromosomes (Bs) in Aegilops mutica were examined using materials collected from 16 natural populations in Turkey and Iran covering almost the entire distribution area of the species. Among 578 plants examined, 173 (29.9 'XI) from 14 populations were found to have one to five Bs. Bs were distributed over the entire geographical area examined. All of the Bs detected were similar in morphology, suggesting their monophyletic origin. The plants with 2Bs were dominant among the B-carrying plants in most populations. Judging from these results, it was suggested that Bs originated, at the latest, at an early stage after the speciation of Ae. muticu, spread by mass migration of outbreeding Ae. mutica, and have been maintained in populations by directed non-disjunction during first pollen grain mitosis. The frequency of B-carrying plants and the mean number of Bs per plant were significantly heterogeneous among populations. No correlation was detected, however, between B frequency and the environmental factors of collection sites. Furthermore, the homogeneous proportion of plants with lB, 2Bs and more than 2Bs among populations suggested no difference in the directed non-disjunction rate among Bs. Based on these results, it was suggested that the significant difference in B frequency was due to the difference not in directed non-disjunction rate but in nonpaired B loss rate during meiosis.

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“…Previously (Romera et a!., 1991), we reported 9 2B x d OB crosses, that we here call 'the parental population' or 'G0', from which we selected seed of those crosses in which B transmission rate was either low or high, and then again made 9 2B X d OB crosses to obtain both the 'low class G1' (LG1) and the 'high class G1' (HG1).…”

Section: Methodsmentioning

confidence: 99%

“…In the first part of this work (Romera et a!., 1991), we carried out selection for the character mean number of Bs per plant in the progeny of 9 2B x d OB crosses, and demonstrated the existence of genotypes which affect this character. The plants from the low transmission rate class tended to lose the Bs, with a mean number of 0.55 Bs per plant in the progeny, while the average mean of the high transmission rate class was 1.85 Bs per plant.…”

Section: Introductionmentioning

confidence: 99%

Genetic control of the rate of transmission of rye B chromosomes. II. 0B × 2B crosses

et al. 1995

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Twenty 9 OB x d 2B crosses were made in which a single male was crossed with four different females, and the character 'mean number of Bs per plant in the progeny' was analysed. The 2B plants used as males and the OB females belonged either to low or to high transmission rate lines, previously selected. The genetic basis of the difference between the high and low transmission rate lines was statistically tested. The male group (high or low class of the 2B male) has a significant effect on the progeny, while the female group (high or low class of the 013 female) has no significant effect. The genes controlling the transmission rate of B chromosomes affect the proportion of OB vs. 2B plants in the OB X 2B cross, but this is not a result of any effect on the nondisjunction mechanism, since the proportion of lB plants is low in all cases. Structural variants of B chromosomes appeared de novo at a high frequency.

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Genetic control of the rate of transmission of rye B chromosomes. I. Effects in 2B × 0B crosses

Cited by 38 publications

References 14 publications

Bewildering Bs: an impression of the 1st B-Chromosome Conference

Bewildering Bs: an impression of the 1st B-Chromosome Conference

Geographical Distribution of B Chromosomes in Aegilops Mutica Boiss., A Wild Relative of Wheat

Genetic control of the rate of transmission of rye B chromosomes. II. 0B × 2B crosses

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