1. bookVolume 54 (2005): Issue 1-6 (December 2005)
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eISSN
2509-8934
First Published
22 Feb 2016
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English
access type Open Access

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

Published Online: 19 Oct 2017
Volume & Issue: Volume 54 (2005) - Issue 1-6 (December 2005)
Page range: 246 - 256
Received: 04 Oct 2005
Journal Details
License
Format
Journal
eISSN
2509-8934
First Published
22 Feb 2016
Publication timeframe
1 time per year
Languages
English
Summary

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.

Keywords

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