scholarly journals Fertility Variation and its Impact on Effective Population Size in Seed Stands of Tamarindus indica and Azadirachta indica

2015 ◽  
Vol 64 (1-6) ◽  
pp. 91-99 ◽  
Author(s):  
R. Kamalakannan ◽  
M. Varghese ◽  
J.-M. Park ◽  
S.-H. Kwon ◽  
J.-H. Song ◽  
...  
Keyword(s):  
Azadirachta Indica ◽  
Male Fertility ◽  
Reproductive Traits ◽  
Fruit Production ◽  
Female Fertility ◽  
Tamarindus Indica ◽  
Individual Tree ◽  
Male And Female ◽  
Fertility Variation ◽  
Status Number

Abstract Growth and reproductive traits were assessed in seed stands of two native Indian tree species Tamarindus indica and Azadirachta indica. Positive correlation between growth (height and GBH) and reproductive traits (male and female contribution) were found in both species. Fertility was estimated from the flower and fruit production of individuals. Based on the fertility variation among individuals, parental balance, femaleness index and status number (Ns) were determined. The option of equal seed collection among individuals was also considered for estimating Ns. The percentage of fertile trees was higher in the high flowering year in both species. The best male contributing individuals also showed high female contribution (fruit production). The parental contribution in seed stands showed high deviation from expectation; 20% individuals contributed about 70% of male and female gametes in both species. Femaleness index showed that female and male contribution of individual tree was more balanced in the good flowering year, compared to the poor year. Coefficient of variation in male and female fertility was higher in the low flowering year resulting in high fertility variation among individuals and low status number. In T. indica, the female contribution was less variable compared to that of male fertility whereas in A. indica the female fertility variation was higher than that of male fertility. The relative status number (Nr = Ns/N) of the stands was lower for male and female fertility compared to the combined (male and female) fertility of individual trees.

scholarly journals Fertility Variation and Status Number Between a Base Population and a Seed Orchard of Pinus brutia

2004 ◽  
Vol 53 (1-6) ◽  
pp. 161-163 ◽  
Author(s):  
N. Bilir ◽  
K.-S. Kang ◽  
D. Zang ◽  
D. Lindgren
Keyword(s):  
Male Fertility ◽  
Seed Orchard ◽  
Female Fertility ◽  
Base Population ◽  
Pinus Brutia ◽  
Fertility Variation ◽  
Status Number ◽  
Relative Status ◽  
Census Number ◽  
Male Strobilus

Abstract Female, male and total fertility variations were estimated in a base population and a seed orchard derived from the base population in Pinus brutia. Relative status number for gametes (female and male contribution) and zygotes (average of female and male contribution) were estimated based on the fertility variation. Average female and male strobilus production were 229.1 and 1003.3 in the base population, and 98.9 and 244.9 in the seed orchard for combined years, respectively. Positive and significant correlations were found between female and male strobilus production in both base population and seed orchard. The male fertility variation was higher than female fertility variation in the seed orchard, while female fertility variation was higher than male fertility variation in the base population. Coefficients of variations in female and male strobilus production were 0.721 and 0.696 in the base population, and 0.403 and 1.110 in the seed orchard for combined years, respectively. Total fertility variation was 1.41 in the base population and 1.40 in the seed orchard for combined years. The relative status numbers estimated based on the total fertility were 70% of census number in the base population, and 71% in the seed orchard for combined years.

Male and Female Fertility Variation in Wild Radish, a Hermaphrodite

1990 ◽  
Vol 136 (1) ◽  
pp. 87-107 ◽  
Author(s):  
B. Devlin ◽  
Norman C. Ellstrand
Keyword(s):  
Female Fertility ◽  
Wild Radish ◽  
Male And Female ◽  
Fertility Variation

scholarly journals Clone Fertility and Genetic Diversity in a Black Pine Seed Orchard

2010 ◽  
Vol 59 (1-6) ◽  
pp. 145-150 ◽  
Author(s):  
M. Ertekin
Keyword(s):  
Genetic Diversity ◽  
Male Fertility ◽  
Seed Orchard ◽  
Clonal Variation ◽  
Black Pine ◽  
Fertility Variation ◽  
The Status ◽  
Status Number ◽  
Census Number ◽  
Male Strobili

AbstractClonal variation in the number of female and male strobili was studied for three consecutive years (2002-2004) in a clonal black pine seed orchard in Turkey. The data showed large differences in female and male fertility among clones in the three years. The correlation between female and male strobilus production was negative and statistically significant in 2004, a good-flowering year. Clonal fertility and fertility variation, expressed by the sibling coefficient and coefficient of variation in strobilus production among 30 clones, were reported. Fertility varied among clones and among years, producing three-year averages of 99.3 and 801.6 for female and male strobili per ramet, respectively. Male fertility variation was higher than was female fertility variation in the three years. The status number, a measure of genetic diversity, was calculated as 26.4 (2002), 23.9 (2003), and 24.0 (2004). On average, the relative status number, estimated based on total fertility, was 86% of the census number. Sexual asymmetry calculations showed that clonal contributions would be balanced between genders. Some management activities such as adjusting ramet number to balance clone contributions and mixing of seeds from consecutive years are suggested for the black pine seed orchard.

scholarly journals EFFECTS OF TOMATO RINGSPOT VIRUS ON DRUPELET SET OF RED RASPBERRY CULTIVARS

1975 ◽  
Vol 55 (3) ◽  
pp. 755-759 ◽  
Author(s):  
HUGH A. DAUBENY ◽  
R. STACE-SMITH ◽  
JACK A. FREEMAN
Keyword(s):  
Adverse Effects ◽  
Male Fertility ◽  
Rubus Idaeus ◽  
Female Fertility ◽  
Ringspot Virus ◽  
Red Raspberry ◽  
Male And Female ◽  
Pollen Quality ◽  
Tomato Ringspot Virus

Tomato ringspot virus (Tom RSV) had particularly adverse effects on drupelet set of the red raspberry (Rubus idaeus L.) cultivars Avon and Lloyd George. It affected Matsqui, Puyallup and Newburgh to a lesser extent. In Tom RSV-infected Newburgh, reduced drupelet set occurred only on those plants showing decline symptoms. With Avon and Lloyd George, reduced drupelet set appeared to involve reductions in male and female fertility. In Matsqui, Puyallup and Newburgh, male fertility as determined by pollen quality did not seem to be affected. Tom RSV did not affect drupelet set of Canby, Carnival, Glen Clova, Latham, Malling Jewel and Meeker.

scholarly journals Correlation scan: identifying genomic regions that affect genetic correlations applied to fertility traits

2021 ◽  
Author(s):  
Babatunde Shittu Olasege ◽  
Laercio R. Porto-Neto ◽  
Muhammad S. Tahir ◽  
Gabriela C. Gouveia ◽  
Angela Cánovas ◽  
...  
Keyword(s):  
Complex Traits ◽  
Genetic Correlations ◽  
Reproductive Traits ◽  
Female Fertility ◽  
Functional Enrichment ◽  
Chromosome X ◽  
Male And Female ◽  
Trade Offs ◽  
Genomic Regions ◽  
Fertility Traits

Although the genetic correlation between complex traits have been estimated for more than a century, only recently we have started to map and understand the precise localization of the genomic region(s) that underpin these correlations. Reproductive traits are often genetically correlated, and yet we don't fully understand the complexities, synergism, or trade-offs between male and female fertility. In this study, we used reproductive traits in two cattle populations to develop a novel framework termed correlation scan. This framework was used to identify regions associated with the genetic correlations between male and female fertility traits across the bovine genome. The traits used were age at first corpus luteum (AGECL) and serum levels of insulin growth hormone (IGF1 measured in bulls, IGF1b, or cows, IGF1c). The methodology developed herein used correlations of 500-SNP (single nucleotide polymorphism) effects in a 100-SNPs sliding window in each chromosome to identify regions in the genome that either drive (i.e., SNP effects on the same direction) or antagonize (i.e., SNP effects in the opposite direction) the genetic correlations between traits. We used a permutation test to confirm which regions of the genome harboured significant correlations. Hence, this framework can also identify neutral genomic regions with no effect on the pairwise trait studied. About 40% of the total genomic regions were identified as driving and antagonizing genetic correlations between male and female fertility traits in the two population. These regions confirmed the polygenic nature of the traits being studied and pointed to genes of interest. Quantitative trait loci (QTL) and functional enrichment analysis revealed that many significant windows co-located with known QTLs related to milk production and fertility traits, especially puberty. In general, the enriched reproductive QTLs driving the genetic correlations between male and female fertility are the same for both cattle populations, while the antagonizing regions were population specific. Moreover, most of the antagonizing regions were mapped to the chromosome X. These results suggest regions of the chromosome X for further investigation into the trade-offs between male and female fertility. Although the methodology was applied to cattle phenotypes, using high-density SNP genotypes, the general framework developed can be applied to any species or traits, and it can easily accommodate genome sequence data.

scholarly journals New opportunities for comparative male fertility research: Insights from a new data resource based on high-quality birth registers

2019 ◽  
Author(s):  
Christian Dudel ◽  
Sebastian Klüsener
Keyword(s):  
Male Fertility ◽  
Large Degree ◽  
Female Fertility ◽  
Parental Age ◽  
High Quality ◽  
Male And Female ◽  
Data Resource ◽  
Fertility Trends ◽  
Human Fertility ◽  
Gender Theories

Obtaining cross-country comparative perspectives on male fertility has long been difficult, as male fertility is usually less well registered than female fertility. This paper presents analyses based on a new male fertility database providing data on more than 330 million live births. This new resource, made available in the Human Fertility Collection, allows for the first time a comparative perspective on male fertility in high-income countries using high-quality birth register data. Contrasting male and female fertility trends across 17 countries, we show that trends in disparities between male and female period fertility rates are driven to a large degree by the interplay of parental age and cohort size differences. For parental age differences at childbirth, we observe a tendency toward smaller disparities, except in Eastern Europe. This observation fits with expectations based on gender theories. However, variation across countries also seems to be driven by factors other than gender equality.

scholarly journals GENETIC ANALYSIS OF CHROMOMERE 3D4 IN DROSOPHILA MELANOGASTER: THE DUNCE AND SPERM-AMOTILE GENES

Genetics ◽  
1982 ◽  
Vol 100 (4) ◽  
pp. 587-596
Author(s):  
Helen K Salz ◽  
Ronald L Davis ◽  
John A Kiger
Keyword(s):  
Drosophila Melanogaster ◽  
Genetic Analysis ◽  
Male Fertility ◽  
Genetic Background ◽  
Female Fertility ◽  
Phosphodiesterase Activity ◽  
Male And Female ◽  
Chromosomal Break ◽  
Gene Maps

ABSTRACT Both male and female Drosophila that are homozygous deficient for chromomere 3D4 are viable but sterile and lack detectable cAMP-specific phosphodiesterase activity. Two genes have been localized to this region: spermamotile (sam) and dunce (dnc). The sperm-amotile gene is required for male fertility, and the dunce gene is required for normal learning, female fertility, and cAMP-specific phosphodiesterase activity. The sperm-amotile gene maps 0.24 map units to the left of dunce. The expression of the dunce gene seems to be affected by a chromosomal break to the left of sperm-amotile. The fertility of dunce females varies according to changes in the genetic background and the presence or absence of an X-linked suppressor.

scholarly journals Land-Use Impact on Stand Structure and Fruit Yield of Tamarindus indica L. in the Drylands of Southeastern Ethiopia

Life ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 408
Author(s):  
Gizachew Zeleke ◽  
Tatek Dejene ◽  
Wubalem Tadesse ◽  
Pablo Martín-Pinto
Keyword(s):  
Land Use ◽  
Stand Structure ◽  
Fruit Production ◽  
Tree Density ◽  
Fruit Yield ◽  
Tamarindus Indica ◽  
Land Use Types ◽  
Significant Difference ◽  
Management Plans ◽  
Baseline Information

In this study, we evaluated stand status, dendrometric variables, and fruit production of Tamarind (Tamarindus indica L.) trees growing in bushland and farmland-use types in dryland areas of Ethiopia. The vegetation survey was conducted using the point-centered quarter method. The fruit yield of 54 trees was also evaluated. Tree density and fruit production in ha were estimated. There was a significant difference in Tamarind tree density between the two land-use types (p = 0.01). The mean fruit yield of farmland trees was significantly higher than that of bushland trees. However, Tamarind has unsustainable structure on farmlands. Differences in the dendrometric characteristics of trees were also observed between the two land-use types. Predictive models were selected for Tamarind fruit yield estimations in both land-use types. Although the majority of farmland trees produced <5000 fruit year−1, the selection of Tamarind germplasm in its natural ranges could improve production. Thus, the development of management plans to establish stands that have a more balanced diameter structure and thereby ensure continuity of the population and fruit yields is required in this area, particularly in the farmlands. This baseline information could assist elsewhere in areas that are facing similar challenges for the species due to land-use change.

scholarly journals Isoflavones alter male and female fertility in different development windows

2021 ◽  
Vol 140 ◽  
pp. 111448
Author(s):  
Hanan Khaled Sleiman ◽  
Jeane Maria de Oliveira ◽  
Guilherme Barroso Langoni de Freitas
Keyword(s):  
Female Fertility ◽  
Male And Female
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