The Ecological Role of Plant Growth Substances

Marinos, Nicos G.

doi:10.1007/978-3-642-67734-2_20

Cited by 12 publications

(9 citation statements)

References 254 publications

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“…cerrioides germination in comparison with Q. ilex could be linked to a lower ABA concentration in the acorns of the former species (for the inhibitory effects of ABA in germination, see Black 1991), that would allow a higher effect of CO 2 in the synthesis of ethylene and consequently promote a higher germination rate (see Salisbury and Marinos 1985).…”

Section: Discussionmentioning

confidence: 99%

Effects of a nursery CO₂enriched atmosphere on the germination and seedling morphology of two Mediterranean oaks with contrasting leaf habit

Cortés

Espelta

Savè³

et al. 2004

New Forests

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Abstract:The use of an enriched CO 2 atmosphere in tree nurseries has been envisaged as a promising technique to increase productivity and to obtain seedlings with a higher root/shoot ratio, an essential trait to respond to water stress in Mediterranean-type ecosystems. In that framework, we have analyzed the effects of three levels of atmospheric CO 2 concentration (350, 500 and 700 ppm) on the germination rate, growth and morphology of seedlings of two Mediterranean oaks used in reforestation programs: the evergreen Quercus ilex L. and the deciduous Quercus cerrioides Wilk. et Costa. CO 2 enrichment increased the germination rate of Q. cerrioides (from 70±7 to 81±3 %) while it decreased that of Q. ilex (from 71±10 to 41±12 %). Seedlings of both species increased approximately 60% their total biomass in response to CO 2 enrichment but at two different CO 2 concentrations: 500 ppm for Q. cerrioides and 700 ppm for Q. ilex. This increase in seedlings biomass was entirely due to an augmentation of root biomass. Considering germination and biomass partitioning, an enriched CO 2 atmosphere might not be appropriate for growing Mediterranean evergreen oaks, such as Q. ilex, since it reduces acorn germination and the only gains in root biomass occur at a high concentration (700 ppm). On the other hand, a moderate CO 2 enrichment (500 ppm) appears as a promising nursery technique to stimulate the germination, growth and root/shoot ratio of deciduous oaks, such as Q. cerrioides.Resumen: El uso de una atmósfera enriquecida en CO 2 durante la fase de vivero puede contribuir a aumentar la producción viverística, a la vez que ayudar a conseguir plántulas con una mayor relación biomasa subterránea/biomasa aérea, más adecuadas para hacer frente al severo estrés hídrico que generalmente limita el éxito de las repoblaciones en el clima Mediterráneo. En este estudio hemos analizado el efecto de tres niveles de abonado carbónico atmosférico (350, 500 y 750 ppm) en la germinación y morfología de plántulas de encina (Quercus ilex) y roble cerrioide (Quercus cerrioides).Una atmósfera enriquecida en CO 2 incrementó la germinación de Q. cerrioides (de 70±7 a 81±3 %) mientras que disminuyó la de Q. ilex (de 71±10 a 41±12 %). Las plántulas de ambas especies incrementaron aproximadamente un 60% su biomasa en respuesta a una mayor concentración de CO 2, aunque esta respuesta se produjo a diferentes dosis: 500 ppm en Q. cerrioides y 700 ppm en Q.ilex. El aumento en la biomasa total de las plántulas se debió enteramente a un mayor desarrollo de su sistema radical, Considerando tanto la germinación como los efectos sobre la relación biomasa subterránea/biomasa aérea, una atmósfera enriquecida en CO 2 no parece ser un tratamiento adecuado para la producción en vivero de plántulas de Q.ilex, puesto que diminuye su germinación y solo aumenta su sistema radicular a dosis muy elevadas (700 ppm). Por el contrario, un aumento moderado en la concentración de CO 2 (500 ppm) aparece como una técnica interesante para estimular el crecimiento y obtener p...

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Section: Discussionmentioning

confidence: 99%

Effects of a nursery CO₂enriched atmosphere on the germination and seedling morphology of two Mediterranean oaks with contrasting leaf habit

Cortés

Espelta

Savè³

et al. 2004

New Forests

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“…tall rather than bushy growth forms. Although the physiology of apical dominance has been the subject of a vast of body of literature (Cline 1991), the ecological and evolutionary implications of apical dominance have been scarcely addressed (Salisbury and Marinos 1985). Under what circumstances is apical dominance favoured by natural selection?…”

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Hypotheses for the Evolution of Apical Dominance in Plants: Implications for the Interpretation of Overcompensation

Aarssen¹

1995

Oikos

194

140

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“…Since the 1850s, many attempts have been made to elucidate the mechanisms mediating light and temperature responses in the control of flowering (Garner and Allard, 1920;Salisbury and Marinos, 1985). More recently, the genetic control of flowering has been studied intensively in Arabidopsis (Arabidopsis thaliana L.…”

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Role of FRIGIDA and FLOWERING LOCUS C in Determining Variation in Flowering Time of Arabidopsis

et al. 2005

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(M.J.A., M.N.) Arabidopsis (Arabidopsis thaliana) accessions provide an excellent resource to dissect the molecular basis of adaptation. We have selected 192 Arabidopsis accessions collected to represent worldwide and local variation and analyzed two adaptively important traits, flowering time and vernalization response. There was huge variation in the flowering habit of the different accessions, with no simple relationship to latitude of collection site and considerable diversity occurring within local regions. We explored the contribution to this variation from the two genes FRIGIDA (FRI) and FLOWERING LOCUS C (FLC), previously shown to be important determinants in natural variation of flowering time. A correlation of FLC expression with flowering time and vernalization was observed, but it was not as strong as anticipated due to many late-flowering/vernalizationrequiring accessions being associated with low FLC expression and early-flowering accessions with high FLC expression. Sequence analysis of FRI revealed which accessions were likely to carry functional alleles, and, from comparison of flowering time with allelic type, we estimate that approximately 70% of flowering time variation can be accounted for by allelic variation of FRI. The maintenance and propagation of 20 independent nonfunctional FRI haplotypes suggest that the loss-of-function mutations can confer a strong selective advantage. Accessions with a common FRI haplotype were, in some cases, associated with very different FLC levels and wide variation in flowering time, suggesting additional variation at FLC itself or other genes regulating FLC. These data reveal how useful these Arabidopsis accessions will be in dissecting the complex molecular variation that has led to the adaptive phenotypic variation in flowering time.

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The Ecological Role of Plant Growth Substances

Cited by 12 publications

References 254 publications

Effects of a nursery CO₂enriched atmosphere on the germination and seedling morphology of two Mediterranean oaks with contrasting leaf habit

Effects of a nursery CO₂enriched atmosphere on the germination and seedling morphology of two Mediterranean oaks with contrasting leaf habit

Hypotheses for the Evolution of Apical Dominance in Plants: Implications for the Interpretation of Overcompensation

Role of FRIGIDA and FLOWERING LOCUS C in Determining Variation in Flowering Time of Arabidopsis

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The Ecological Role of Plant Growth Substances

Cited by 12 publications

References 254 publications

Effects of a nursery CO2enriched atmosphere on the germination and seedling morphology of two Mediterranean oaks with contrasting leaf habit

Effects of a nursery CO2enriched atmosphere on the germination and seedling morphology of two Mediterranean oaks with contrasting leaf habit

Hypotheses for the Evolution of Apical Dominance in Plants: Implications for the Interpretation of Overcompensation

Role of FRIGIDA and FLOWERING LOCUS C in Determining Variation in Flowering Time of Arabidopsis

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Effects of a nursery CO₂enriched atmosphere on the germination and seedling morphology of two Mediterranean oaks with contrasting leaf habit

Effects of a nursery CO₂enriched atmosphere on the germination and seedling morphology of two Mediterranean oaks with contrasting leaf habit