Pollen Tube Growth Rates in
            <i>Zea mays</i>
            : Implications for Genetic Improvement of Crops

Ottaviano, E.; Sari‐Gorla, M.; Mulcahy, David L.

doi:10.1126/science.210.4468.437

Cited by 120 publications

(39 citation statements)

References 5 publications

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“…The rate of tube growth in the tubes carrying the marker gene could be estimated indirectly by scoring kernel colour, and F 1 kernel characters expressed as regression coefficients. Results suggest that the most rapidly growing tubes (which were able to effect fertilization) gave rise to seedlings which had a significantly increased dry weight and other sporophytic characters (OTTAVIANO et al 1980). These data need to be confirmed by experiments with other species.…”

Section: Pollen-tube Growth and Gamete Competitionmentioning

confidence: 88%

“…The growth rates of different types of pollen tubes are regulated by the stylar environment, and may vary in different styles. In maize, the pollen-tube growth rates of pollen from five inbred lines were estimated in the styles of five other lines in pollen mixtures against a standard pollen source which carried a marker for aleurone colour in the kernel (OTTAVIANO et al 1980). The rate of tube growth in the tubes carrying the marker gene could be estimated indirectly by scoring kernel colour, and F 1 kernel characters expressed as regression coefficients.…”

Section: Pollen-tube Growth and Gamete Competitionmentioning

confidence: 99%

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Pollen-Pistil Interactions

Knox¹

1984

Cellular Interactions

187

134

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Section: Pollen-tube Growth and Gamete Competitionmentioning

confidence: 88%

Section: Pollen-tube Growth and Gamete Competitionmentioning

confidence: 99%

Pollen-Pistil Interactions

Knox¹

1984

Cellular Interactions

187

134

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“…The major advantage of fast pollen tube growth rates is assumed to be gametophytic competition in mixed pollen loads (Haldane, 1932 ;Stephenson & Bertin, 1983). Many studies have suggested that rapid pollen tube growth rates are correlated with increased progeny vigour (Mulcahy & Mulcahy, 1975 ;Ottaviano et al, 1980 ;Schlichting et al, 1987 ;Quesada et al, 1991 ;Delph et al, 1998). This selection pressure in favour of fast pollen tube *Author for correspondence (present address) : School of Conservation Sciences, Bournemouth University, Dorset House, Talbot Campus, Fern Barrow, Poole, Dorset BH12 5BB, UK (fax j44 1202 595255 ; e-mail adiaz!bournemouth.ac.uk).…”

Section: mentioning

confidence: 99%

Pollen tube competition as a mechanism of prezygotic reproductive isolation between Mimulus nasutus and its presumed progenitor M. guttatus

1999

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This paper considers the extent to which differences in pollen tube growth rates can provide prezygotic reproductive isolation between Mimulus nasutus and its presumed progenitor, Mimulus guttatus. Mimulus nasutus is partially cleistogamous, but its larger chasmogamous flowers offer appreciable opportunity for outcrossing. Mimulus nasutus was found to have smaller pollen grains and shorter styles than M. guttatus. No differences were observed in pollen grain germination on conspecific and heterospecific stigmas. However, pollen tube growth rates of M. nasutus were found to be much slower than those of M. guttatus in the styles of that species. Consequently, any M. nasutus pollen transferred to an M. guttatus stigma was found to be competitively disadvantaged in an M. gutattus style. By contrast, no difference in pollen tube growth rate was detected between the species when growing in M. nasutus styles, possibly because M. nasutus styles are unable to support fast pollen tube growth. We tested the prediction from the pollen tube studies that a 50 : 50 mix of M. guttatus and M. nasutus pollen would produce 50% hybrid seeds when M. nasutus was the maternal parent, and near to 0% hybrid seed when M. guttatus was the maternal parent. The results were found to support this prediction. We conclude that pollen-pistil interactions can effect strong reproductive isolation between these species, as M. guttatus pollen tubes have a competitive advantage over those of M. nasutus in an M. guttatus style, but not in an M. nasutus style.

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“…Parental pollen tube growth rates of germinating maize pollen are positively correlated with seedling dry weight, ear weight, and grain yield of the resultant hybrids (15). Pollen tube growth is promoted through exogenous application of GA (3,11), and increases in endogenous GA of untreated pollen is positively correlated with increased pollen germination and rapid pollen tube growth (1,10).…”

Section: Resultsmentioning

confidence: 89%

Gibberellins and Heterosis in Maize

Rood¹,

Blake²,

Pharis³

1983

Plant Physiol.

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ABSTRACITwo maize inbreds, CM7 and CM49, and CM7 x CM49, their F1 hybrid (which displayed significant heterois), were examined with regard to response to exogenous gibberellin As (GA3), and in their ability to metaboie GA2, a native GA of m The leaf sheath t respone to GAs was far greater for the beds thad for their hybrid. The inreds also displayed s f t elogati of the leaf blades in response to GA3, whereas the hybrid was unaffect Promotion of cell division in the leaf sbeath of CM7 and the hybrid was effected by GA3, but no promotion of cell elongation was observed in CM49, even though significant leaf sheath elongation occufred. Shoot dry weight of both inbeds was s ty increased by GAs, but respoe by the hybrid in this parameter was sligt and variable. Root dry weight of CM7 was ignficanty increased by GA3, but was uhg in CM49 and the hybriL Thus, inbred shoot dry weight increases effected by GAs were not at the expense of the root system. Rapid metsm of 12Z3-"HIGA2* occurred in a9l genotpes, ahug h genotypic differences were observed. The hybrid had the higbest rates of metabolism to GA ghlcosyl conjugate-like substances. Oxidative metabolism was also fastest in the hybrid, folowed by CM7, ad slowest in CM49, the slowest-growing inbred. Ihus, rate of GA2. metabolism is under genetic control in normal (ie. not dwarfed) maize genotypes. These results, taken together with previous reports that the hybrid has significantly enhanced leels of endogenous GA-like substances, suggest that GA play a role in the expression of heterosis in maize.

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Pollen Tube Growth Rates in Zea mays : Implications for Genetic Improvement of Crops

Cited by 120 publications

References 5 publications

Pollen-Pistil Interactions

Pollen-Pistil Interactions

Pollen tube competition as a mechanism of prezygotic reproductive isolation between Mimulus nasutus and its presumed progenitor M. guttatus

Gibberellins and Heterosis in Maize

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