<abstract xmlns="http://www.w3.org/1999/xhtml"> Two equations were formulated in order to estimate the degree of sexual asymmetry for monoecious species. The concepts of the equations were formulated on the basis of the effective population numbers of female and male parents [i.e, As(v)], and the differences of relative frequency between genders [i.e., As(x)]. These equations were applied to estimate the degree of sexual asymmetry based on the empirical data of flowering assessment in a clonal seed orchard of Pinus densiflora. The yearly variation in the production of female and male strobili was found. The effective population numbers at gamete levels (vf and vm) and clone level (vb) varied among 8 observation years. Both As(x) and As(v) were negatively correlated with effective numbers at gamete and clone levels. Averages of female and male strobilus production and estimates of sexual asymmetry were negatively correlated but the correlation was not significant. The correlations among effective number of clone (vb), arithmetic mean of female and male effective numbers (va) and estimate of sexual asymmetry [As(x)] were strong and significant. Relatively larger difference between vb and va were found when higher level of sexual asymmetry were observed.</abstract>

Two equations were formulated in order to estimate the degree of sexual asymmetry for monoecious species. The concepts of the equations were formulated on the basis of the effective population numbers of female and male parents [i.e, As(v)], and the differences of relative frequency between genders [i.e., As(x)]. These equations were applied to estimate the degree of sexual asymmetry based on the empirical data of flowering assessment in a clonal seed orchard of Pinus densiflora. The yearly variation in the production of female and male strobili was found. The effective population numbers at gamete levels (vf and vm) and clone level (vb) varied among 8 observation years. Both As(x) and As(v) were negatively correlated with effective numbers at gamete and clone levels. Averages of female and male strobilus production and estimates of sexual asymmetry were negatively correlated but the correlation was not significant. The correlations among effective number of clone (vb), arithmetic mean of female and male effective numbers (va) and estimate of sexual asymmetry [As(x)] were strong and significant. Relatively larger difference between vb and va were found when higher level of sexual asymmetry were observed.

Sexual Asymmetry based on Flowering Assessment in a Clonal Seed Orchard of Pinus densiflora

Silvae Genetica

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

Two equations were formulated in order to estimate the degree of sexual asymmetry for monoecious species. The concepts of the equations were formulated on the...

Sexual Asymmetry based on Flowering Assessment in a Clonal Seed Orchard of Pinus densiflora

Published Online: Oct 27, 2017

Page range: 55 - 59

Received: Aug 08, 2003

DOI: https://doi.org/10.1515/sg-2004-0010

Keywords
sexual asymmetry, effective number, strobilus production, fertility, coefficient of variation

© 2017

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

Sexual Asymmetry based on Flowering Assessment in a Clonal Seed Orchard of Pinus densiflora

Published Online: Oct 27, 2017

Page range: 55 - 59

Received: Aug 08, 2003

DOI: https://doi.org/10.1515/sg-2004-0010

Keywordssexual asymmetry, effective number, strobilus production, fertility, coefficient of variation

© 2017

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

Keywords
sexual asymmetry, effective number, strobilus production, fertility, coefficient of variation