scholarly journals Study of the Bioecology of Aleurolobus olivinus Silvestri (1911) (Homoptera, Aleyrodidae) on olive Trees in Algeria

2019 ◽  
Vol 9 (3) ◽  
pp. 291-299
Author(s):  
A. Fethi ◽  
B. Abdelmadjid ◽  
A. Abderrahim
Keyword(s):  
Life Cycle ◽  
Ecological Study ◽  
Olive Tree ◽  
Fine Mesh ◽  
The Family ◽  
Two Generations ◽  
Olea Europea ◽  
Olive Trees ◽  
Autumn And Winter ◽  
Phillyrea Angustifolia

Aleurolobus olivinus is an insect of the family Aleyrodidae and the subfamily Aleyrodinae, considered as a secondary pest of olive trees, Olea europea, and has also been reported on Phillyrea angustifolia, P. latifolia and on Erica spp. It consists of a bio-ecological study, in particular of the life cycle that has been carried out on the branches of trees covered with a fine mesh net to avoid possible exchanges of individuals, while for the ecological study, leaf samples have been taken according to cardinal directions and branches 50 cm long according to their age, on 4 varieties of olive tree. The black whitefly generates two generations, one from April to September and the other from October to March. The life cycle lasts 79 to 98 days. Larvae mainly prefer the upper surface of the foliage in the South and Estet are abundant in autumn and winter and the varieties Zaiti (33.3%) and Sorani (27.4%) are the most infested compared to Terella and Khodeiri (21.8%) and (17.4%). It is the twigs of the year that are most attacked. The parasitism rate varies according to the month and season, it is 17% in autumn and 7.6% in winter while the monthly rate is 6% in May and 21.5% in November.

scholarly journals Genetic mapping of sex and self-incompatibility determinants in the androdioecious plant Phillyrea angustifolia

2021 ◽  
Author(s):  
Amélie Carré ◽  
Sophie Gallina ◽  
Sylvain Santoni ◽  
Philippe Vernet ◽  
Cécile Godé ◽  
...  
Keyword(s):  
Linkage Map ◽  
Olive Tree ◽  
Self Incompatibility ◽  
Sexual Systems ◽  
Group 12 ◽  
The Family ◽  
Reliable Genotypes ◽  
Phillyrea Angustifolia ◽  
F1 Cross

AbstractThe diversity of mating and sexual systems in Angiosperms is spectacular, but the factors driving their evolution remain poorly understood. In plants of the Oleaceae family, an unusual self-incompatibility (SI) system has been discovered recently, whereby only two distinct homomorphic SI specificities segregate stably. To understand the role of this peculiar SI system in preventing or promoting the diversity of sexual phenotypes observed across the family, an essential first step is to characterize the genetic architecture of these two traits. Here, we developed a high-density genetic map of the androdioecious shrub P. angustifolia based on a F1 cross between a hermaphrodite and a male parent with distinct SI genotypes. Using a double restriction-site associated digestion (ddRAD) sequencing approach, we obtained reliable genotypes for 196 offspring and their two parents at 10,388 markers. The resulting map comprises 23 linkage groups totaling 1,855.13 cM on the sex-averaged map. We found strong signals of association for the sex and SI phenotypes, that were each associated with a unique set of markers on linkage group 12 and 18 respectively, demonstrating inheritance of these traits as single, independent, mendelian factors. The P. angustifolia linkage map shows robust synteny to the olive tree genome overall. Two of the six markers strictly associated with SI in P. angustifolia have strong similarity with a recently identified 741kb chromosomal region fully linked to the SI phenotype on chromosome 18 of the olive tree genome, providing strong cross-validation support. The SI locus stands out as being markedly more rearranged, while the sex locus has remained relatively more collinear. This P. angustifolia linkage map will be a useful resource to investigate the various ways by which the sex and SI determination systems have co-evolved in the broader phylogenetic context of the Oleaceae family.

scholarly journals STATE OF AGRO-DIVERSITY IN A MOUNTAIN ECOSYSTEM: CASE OF THE OLIVE TREE (OLEA EUROPEA L.) IN THE MOUNTAINS OF BENI-SNOUS: (TLEMCEN-ALGERIA)

2021 ◽  
Vol 21 (no 1) ◽  
Author(s):  
Fatima Khemies ◽  
Bahae- Ddine Ghezlaoui-Bendi-Djelloul ◽  
Bahae- Ddine Ghezlaoui-Bendi-Djelloul
Keyword(s):  
Olive Tree ◽  
Mountainous Areas ◽  
Ecological Sites ◽  
Fruit Species ◽  
Mountain Ecosystem ◽  
Local Product ◽  
Olea Europea ◽  
Fruit Growing ◽  
Olive Trees ◽  
By Products

Fruit growing in the Tlemcen region is carried out in a more or less traditional way, and this is largely the result of a lack of knowledge of areas favorable to a particular fruit species, but also of a lack of training and initiatives. Many fruit species are considered as a local product because they occupy mountainous areas with rugged relief. The latter have organoleptic qualities specific to the ecosystem in which they live. Hence the name of niche product. The most significant example is the Sigoise olive or Olive of the Tlemcen mountains. Thus the present study aims to enhance and preserve some experiences of upkeep and preservation of olive trees in mountainous ecological sites with very difficult relief. This aspect has made it possible to generate varieties of olives with by-products of highly appreciated qualitative value.

Morphology and taxonomy of the Dasyaceae and the Lophothalieae (Rhodomelaceae) of the Rhodophyta

1975 ◽  
Vol 23 (4) ◽  
pp. 549 ◽  
Author(s):  
MJ Parsons
Keyword(s):  
Life Cycle ◽  
Type Species ◽  
Parallel Evolution ◽  
Morphological Studies ◽  
The Family ◽  
Two Generations ◽  
Fusion Cell ◽  
Superficial Similarity ◽  
New Tribe ◽  
Sympodial Growth

To date the knowledge of the family Dasyaceae has been obtained from species known only in the northern hemisphere, yet southern Australia is an important centre of distribution for species of this family. These morphological studies on the Dasyaceae concern four species of Dasya (Dasya clavigera (Womersley) comb. nov. has been transferred from Dasyopsis), five species of Heterosiphonia and two species of Thuretia. Additional comments are made on a further species of Dasya and one of Heterosiphonia. New descriptions of the genera are given. Several features reported in the literature as being characteristic of the Dasyaceae are found to be inconsistent and it is shown that the development of the fusion cell, and the sympodial growth of the thallus, are good family characters. Three genera of the tribe Lophothalieae (Rhodomelaceae) are studied because of their superficial similarity with species in the Dasyaceae. The type species of Lophothalia, Doxodasya and Haplodasya, and one other species of Doxodasya and Haplodasya (H. tomentosa sp. nov.) are studied in detail to provide an understanding of the tribe Lophothalieae. Haplodasya, once placed in the Dasyaceae, is removed to the Lophothalieae. Comparisons of the Lophothalieae with Brongniartella (as described in the literature) are made and the differences require the formation of a new tribe, the Brongniartelleae, to take Brongniartella and similar genera once placed close to Lophothalia. It would appear that the Lophothalieae and the Dasyaceae are examples of parallel evolution of thallus form and are not closely related. Two species of Dasya and two of Heterosiphonia were used in an attempt to culture these plants completely through their life cycle in the laboratory. Dasya clavigera has been successfully taken through its life cycle for two generations of sexual plants and one of tetrasporangial plants. No other species grew to reproductive maturity.

Analysis of Ambiguous Loss and the Family Life Cycle

2013 ◽  
Author(s):  
Laura A. Scudellari ◽  
Bethany A. Pecora-Sanefski ◽  
Andrew Muschel ◽  
Jane R. Piesman ◽  
Thomas P. Demaria
Keyword(s):  
Life Cycle ◽  
Family Life ◽  
Ambiguous Loss ◽  
Family Life Cycle ◽  
The Family

Every Olive Tree in the Garden of Gethsemane

2013 ◽  
Vol 3 (2) ◽  
pp. 111-115 ◽  
Author(s):  
Wendy Babcox
Keyword(s):  
Olive Tree ◽  
Photographic Images ◽  
The Future ◽  
Olive Trees ◽  
The Many ◽  
Radical Transformation

Every Olive Tree in the Garden of Gethsemane is a suite of photographic images of each of the twenty-three olive trees in the garden. Situated at the foot of the Mount of Olives in Jerusalem, the Garden of Gethsemane is known to many as the site where Jesus and his disciples prayed the night before his crucifixion. The oldest trees in the garden date to 1092 and are recognized as some of the oldest olive trees in existence. The older trees are a living and symbolic connection to the distant past, while younger trees serve as a link to the future. The gnarled trunks seem written with the many conflicts that have been waged in an effort to control this most-contested city; a city constantly on the threshold of radical transformation.

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