<abstract xmlns="http://www.w3.org/1999/xhtml"><p> Reproductive phenology was studied in a Pinus radiata seed orchard, located in northern Spain. Timing of flowering was determined on the basis of data recorded by visual observations made in 2000, 2001 and 2002. The genetic and environmental factors affecting female and male phenology, as well as reproductive synchronization, were studied. The dates of beginning of the receptive phase and pollen shedding varied greatly from year to year but the variation on the sum of degree-days was low. In general, the flowering periods of the different clones overlapped. The clonal differences in the phenology of receptivity and pollen shedding were in most cases statistically significant. The time needed to reach flowering stages was under strong genetic control. Genetic control was stronger for the female than the male flowering process. However, correlations between years were stronger for male than for female flowering phenology. The male flowering clones that best synchronized with the females appeared to be those that started flowering earlier. The phenological overlap index varied greatly among clones, whether male or female, and also among years.</p></abstract>

Reproductive phenology was studied in a Pinus radiata seed orchard, located in northern Spain. Timing of flowering was determined on the basis of data recorded by visual observations made in 2000, 2001 and 2002. The genetic and environmental factors affecting female and male phenology, as well as reproductive synchronization, were studied. The dates of beginning of the receptive phase and pollen shedding varied greatly from year to year but the variation on the sum of degree-days was low. In general, the flowering periods of the different clones overlapped. The clonal differences in the phenology of receptivity and pollen shedding were in most cases statistically significant. The time needed to reach flowering stages was under strong genetic control. Genetic control was stronger for the female than the male flowering process. However, correlations between years were stronger for male than for female flowering phenology. The male flowering clones that best synchronized with the females appeared to be those that started flowering earlier. The phenological overlap index varied greatly among clones, whether male or female, and also among years.

Variation in Reproductive Phenology in a Pinus radiata D. Don Seed Orchard in Northern Spain

Silvae Genetica

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Reproductive phenology was studied in a Pinus radiata seed orchard, located in northern Spain. Timing of flowering was determined on the basis of data recorded...

Variation in Reproductive Phenology in a Pinus radiata D. Don Seed Orchard in Northern Spain

Published Online: Oct 19, 2017

Page range: 246 - 256

Received: Oct 04, 2005

DOI: https://doi.org/10.1515/sg-2005-0035

Keywords
flowering receptivity, pollen shedding, reproductive synchronization, flowering phenograms, cumulative growing degree-days, phenological overlap index, SYNCHRO.SAS programme, clonal repeatibility, progeny test, genetic variation, genetic parameters, quantitative traits

© 2017

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Variation in Reproductive Phenology in a Pinus radiata D. Don Seed Orchard in Northern Spain

Published Online: Oct 19, 2017

Page range: 246 - 256

Received: Oct 04, 2005

DOI: https://doi.org/10.1515/sg-2005-0035

Keywordsflowering receptivity, pollen shedding, reproductive synchronization, flowering phenograms, cumulative growing degree-days, phenological overlap index, SYNCHRO.SAS programme, clonal repeatibility, progeny test, genetic variation, genetic parameters, quantitative traits

© 2017

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
flowering receptivity, pollen shedding, reproductive synchronization, flowering phenograms, cumulative growing degree-days, phenological overlap index, SYNCHRO.SAS programme, clonal repeatibility, progeny test, genetic variation, genetic parameters, quantitative traits