A resilient brooding coral in the broadcast spawning Porites lobata species complex: a new endemic, introduced species, mutant, or new adaptive potential?

Crossbreeding experiments were used to estimate cryptic species in water bodies of Ukraine and Russia because the most useful criterion in species independence is reproductive isolation. The problem of cryptic species in the genus Eucyclops was examined using interpopulation crosses of populations collected from Baltic Sea basin (pond of Strelka river basin) and Black Sea basin (water-reservoires of Dnieper, Dniester and Danube rivers basins). The results of reciprocal crosses in Eucyclops serrulatus-group are shown that E. serrulatus from different populations but from water bodies belonging to the same river basin crossed each others successfully. The interpopulation crosses of E. serrulatus populations collected from different river basins (Dnipro, Danube and Dniester river basins) were sterile. In this group of experiments we assigned evidence of sterility to four categories: 1) incomplete copulation or absence of copulation; 2) nonviable eggs; 3) absence of egg membranes or egg sacs 4) empty egg membranes. These crossbreeding studies suggest the presence of cryptic species in the E. serrulatus inhabiting ecologically different populations in many parts of its range. The same crossbreeding experiments were carries out between Eucyclops serrulatus and morphological similar species – Eucyclops macruroides from Baltic and Black Sea basins. The reciprocal crossings between these two species were sterile. Thus taxonomic heterogeneity among species of genus Eucyclops lower in E. macruroides than in E. serrulatus. The interpopulation crosses of E. macruroides populations collected from distant part of range were fertile. These crossbreeding studies suggest that E. macruroides species complex was evaluated as more stable than E. serrulatus species complex.

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Adaptive Potential of Rapana venosa Speciemens of Different Age, Sex and Size

Hydrobiological Journal ◽

10.1615/hydrobj.v53.i5.30 ◽

2017 ◽

Vol 53 (5) ◽

pp. 29-37

Author(s):

V. A. Toptikov ◽

O. O. Kovtun ◽

T. G. Alekseyeva ◽

V. M. Totskiy

Keyword(s):

Adaptive Potential ◽

Rapana Venosa

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Colletotrichum Gloeosporioides Species Complex: Pathogen Causing Anthracnose, Gummosis and Die-Back Diseases of Cashew (Anacardium Occidentale L.) In Ghana

European Journal of Agriculture and Food Sciences ◽

10.24018/ejfood.2020.2.6.146 ◽

2020 ◽

Vol 2 (6) ◽

Author(s):

A. Muntala ◽

P. M. Norshie ◽

K. G. Santo ◽

C. K. S. Saba

Keyword(s):

Species Complex ◽

Colletotrichum Gloeosporioides ◽

Potato Dextrose Agar ◽

Causal Agent ◽

Anacardium Occidentale ◽

Causative Organism ◽

Pathogenicity Test ◽

Small Water ◽

Colletotrichum Gloeosporioides Species Complex

A survey was conducted in twenty-five cashew (Anacardium occidentale) orchards in five communities in the Dormaa-Central Municipality of Bono Region of Ghana to assess the incidence and severity of anthracnose, gummosis and die-back diseases on cashew. Cashew diseased samples of leaves, stem, inflorescences, twigs, flowers, nuts and apples showing symptoms (e. g. small, water-soaked, circular or irregular yellow, dark or brown spots or lesions on leaves, fruits and flowers, sunken surface, especially on the apples, blight, gum exudates) were collected for isolation of presumptive causative organism. The pathogen was isolated after disinfecting the excised diseased pieces in 70% ethanol, plated on potato dextrose agar (PDA) and incubated at 28 oC for 3 to 7 days. The identity of the putative pathogen was morphologically and culturally confirmed as belonging to Colletotrichum gloeosporioides species complex using standard mycological identification protocols. The pathogen had varied conidia sizes of between 9-15 up to 20 μm in length and diameter of 3-6 μm. The conidia were straight and cylindrically shaped with rounded or obtuse ends. The septate mycelium was whitish-grey, velvety and cotton-like in appearance from the top. The results confirmed the presence of the pathogen in the orchards with incidence ranging from 6.9% and 14.0% for gummosis and averaged 22.9% for anthracnose infected orchards. The result of the pathogenicity test confirmed the isolates to be pathogenic on inoculated cashew seedlings and were consistently re-isolated, thereby establishing the pathogen as the true causal agent of the said diseases in cashew trees and thus completed the Koch’s postulate.

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ADAPTIVE POTENTIAL OF SWEET CHERRY VARIETIES AND THEIR PRODUCTIVITY

Scientific Works of North Caucasian Federal Scientific Center of Horticulture Viticulture Wine-making ◽

10.30679/2587-9847-2018-19-45-48 ◽

2018 ◽

Vol 19 ◽

pp. 45-48

Author(s):

E.M. Alekhina ◽

Keyword(s):

Sweet Cherry ◽

Adaptive Potential

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A method for rearing Arhopalus ferus (Mulsant) (Coleoptera Cerambycidae) larvae on a modified artificial diet

New Zealand Plant Protection ◽

10.30843/nzpp.2015.68.5812 ◽

2015 ◽

Vol 68 ◽

pp. 353-359 ◽

Cited By ~ 2

Author(s):

A.M. Barrington ◽

D.P. Logan ◽

P.G. Connolly

Keyword(s):

Introduced Species ◽

Artificial Diet ◽

Larval Density ◽

Pine Bark ◽

Pine Wood ◽

Rearing Method ◽

Sawn Timber

Burnt pine longhorn (BPL) Arhopalus ferus (Mulsant) (Coleoptera Cerambycidae) is an introduced species sometimes found in association with export logs and sawn timber A rearing method was developed to produce larvae of a known age number and quality for control trials Growth of larvae from newly hatched to 5 weeks was measured on a standard cerambycid artificial diet and on modified diets Replacing pine wood with pine bark sawdust increased survival at 5 weeks from 23 to 76 and mean weight from 9 to 21 mg There were significant interactions between the influences of three factors (diet period of rearing initial larval density) on the weight of surviving larvae Individual rearing was preferred for convenience and a standardised method was used to rear 8740 larvae for disinfestation trials Establishment and survival to 6 weeks for these larvae was 97

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THE INTEGRATED PEAR DONORS WITH MONOGENIC DETERMINED STUNT

Vestnik of the Russian agricultural science ◽

10.30850/vrsn/2018/4/17-19 ◽

1970 ◽

pp. 17-19

Author(s):

Е. А. Dolmatov ◽

Т. А. Khrykina

Keyword(s):

Disease Resistance ◽

Russian Federation ◽

Fungal Disease ◽

Winter Hardiness ◽

Adaptive Potential ◽

Research Institutes ◽

Fungal Disease Resistance ◽

Sorting Process ◽

Red Coloration

Development of low-growing varieties is one of the prioritized directions in groups selection. Solution of excessive growth in the selection can be solved in today’s conditions by two means: on a polygenic and on a monogenic level. Up until recently such work was performed by research institutes of horticulture in the U.S.S.R. and Russian Federation only on the polygenic level. The analysis is performed for the data of 17 summer studies on the development of complex donors of monogenic determined dwarfness (gene D), high winter hardiness, group fungal disease resistance (scab, leaf spot and Septoria blight) and bright red coloration of pear fruits (gene C). On the first stage of these studies the issue of the development of population of hybrid dwarf types with high adaptive potential in the conditions of the Central Black Earth region of Russia was solved based on a hybridization of the donors of high winter hardiness and fungal disease resistance with the donors of monogenic determined dwarfness which were the descendants of 4th generation of the NainVert variety. As a result, several complex donors were selected. Its use in long-term pear selection programs would make sorting process possible on earlier stages of the ontogenesis and thanks to that would make it possible to halve the size of hybrid funds. Brief description of the complex donors is given.

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