Genetic variation and relationships of seven sturgeon species and ten interspecific hybrids

Gonad development in fish is generally assumed to be negatively influenced by interspecific hybridization, resulting in sterility or sub-sterility. However, this is not the case in sturgeons (Acipenseridae), in which fertile hybrids are common. In the present study, we investigated gonad development in several sturgeon interspecific hybrids and purebred species. Six interspecific hybrid groups and three purebred groups were analyzed including 20 hybrid specimens with even ploidy, 40 specimens having odd ploidy levels, and 30 purebred specimens. Hybrids of species with the same ploidy (even ploidy – 2n, 4n) exhibited normally developed gonads similar to those seen in purebred specimens. In contrast, hybrids of species differing in ploidy (odd ploidy – 3n) did not display fully developed gonads. Ovaries were composed of oocytes or nests of differentiating oocytes that ceased development in early stages of meiosis (pachytene to zygotene) with a higher content of adipose and apoptotic tissue. Testes contained single spermatogonia along with Sertoli cells and spaces lacking germ cells. The obtained results showed that gonad development was influenced by genetic origin and ploidy of the sturgeon hybrids and were consistent with full fertility of hybrids with even ploidy. Sterility of females, but possibly limited fertility of males, is suggested for hybrids with odd ploidy.

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Ontogenic Resistance to Uncinula necator Varies by Genotype and Tissue Type in a Diverse Collection of Vitis spp.

Plant Disease ◽

10.1094/pdis-92-7-1067 ◽

2008 ◽

Vol 92 (7) ◽

pp. 1067-1073 ◽

Cited By ~ 24

Author(s):

Christopher T. Gee ◽

David M. Gadoury ◽

Lance Cadle-Davidson

Keyword(s):

Genetic Variation ◽

Powdery Mildew ◽

Interspecific Hybrids ◽

Germplasm Collection ◽

Tissue Type ◽

Uncinula Necator ◽

Vitis Species ◽

Ontogenic Resistance ◽

High Level ◽

Vitis Spp

Berries of grapevine (Vitis spp.) have a limited window of susceptibility to Uncinula necator, the causal agent of grapevine powdery mildew, until the onset of ontogenic resistance approximately 2 to 3 weeks postbloom. This phenomenon has been demonstrated in several cultivars of V. vinifera and in V. labruscana ‘Concord’, which all exhibited a similar duration of susceptibility. To identify genetic variation for ontogenic resistance, we screened a diverse collection of Vitis species and interspecific hybrids maintained in the USDA-ARS cold-hardy Vitis germplasm collection in Geneva, NY. Of the 79 genotypes whose fruit clusters were screened for susceptibility to powdery mildew under field conditions, 50 exhibited a high level of constitutive resistance to powdery mildew and did not develop more than trace levels of disease when inoculated, irrespective of the stage of berry development at inoculation. Twenty-four genotypes exhibited a significant gain of resistance as berries aged. This ontogenic resistance was conserved across four species and several interspecific hybrids of Vitis spp., although the timing of the onset of ontogenic resistance varied by genotype. The mechanism of ontogenic resistance was examined for four genotypes. Similar to previous studies, ontogenic resistance greatly reduced the incidence of successful penetration. Despite the broad conservation of ontogenic resistance across species, one genotype (V. rupestris ‘R-65-44’) remained susceptible past the onset of ripening, over 1 month later than reported previously for V. vinifera and V. labruscana. Variation in the resistance phenotype was observed among the rachis, pedicels, and berries within clusters of the majority of genotypes studied. The genetic variation in ontogenic resistance, in particular the discovery of a genotype in which berries remain susceptible as they mature, will facilitate further study of the inheritance and molecular basis of ontogenic resistance.

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Genetic Variation of Fatty Acid Components in Arachis Species and Development of Interspecific Hybrids with High Oleic and Low Palmitic Acids

ACTA AGRONOMICA SINICA ◽

10.3724/sp.j.1006.2009.00025 ◽

2009 ◽

Vol 35 (1) ◽

pp. 25-32

Author(s):

Hui-Fang JIANG ◽

Xiao-Ping REN ◽

Jia-Quan HUANG ◽

Yong LEI ◽

Bo-Shou LIAO

Keyword(s):

Genetic Variation ◽

Fatty Acid ◽

Interspecific Hybrids ◽

High Oleic ◽

Palmitic Acids

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Genetic study with Heliconia psittacorum and interspecific hybrids

Cropp Breeding and Applied Biotechnology ◽

10.1590/s1984-70332010000400001 ◽

2010 ◽

Vol 10 (4) ◽

pp. 282-288 ◽

Cited By ~ 9

Author(s):

Francisco Herverton Albuquerque Rocha ◽

Vivian Loges ◽

Andreza Santos da Costa ◽

Fernando Antônio Souza de Aragão ◽

Venézio F Santos

Keyword(s):

Genetic Variation ◽

Total Variation ◽

Genetic Study ◽

Interspecific Hybrids ◽

Genetic Correlations ◽

Heritability Estimate ◽

Stem Diameter ◽

Variation Coefficient ◽

Shoot Emergence ◽

Inflorescence Length

A genetic study of seven cultivars of H. psittacorum and Heliconia interspecific hybrids was carried out. The heritability estimate and genetic variation coefficient were highest for stem diameter (SD) (99.32% and 56.90%, respectively) and for CVg/CVe (1.85), indicating a favorable situation for selection. The genetic correlations of SD with days to inflorescence emergence (DIE) (0.64), period from shoot emergence to stem cut (CYCLE) (0.63) and stem weight (SW) (0.96) showed that the time from inflorescence emergence to cut is longer and the stem weight is greater for genotypes with larger stem diameter. Inflorescence length (IL), SD and DIE were the most important traits, accounting for 99.55% of the total variation. For SD and IL, the repeatability values exceeded 0.60 and for SD, SW, DIE and IL the coefficients of determination exceeded 93%.

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PHYSIOLOGICAL INDICES OF BELUGA AND SHIP AND THEIR INTERSPECIFIC HYBRIDS IN FISH-FARM CONDITIONS

VESTNIK OF ASTRAKHAN STATE TECHNICAL UNIVERSITY SERIES FISHING INDUSTRY ◽

10.24143/2073-5529-2020-4-154-164 ◽

2020 ◽

Vol 2020 (4) ◽

pp. 154-164

Author(s):

Elena Mikhailovna Evgrafova ◽

Olga Pyatikopova ◽

Irina Bedritskaya ◽

Ekaterina Pavlovna Yakovleva ◽

Anisia Victorovna Dubovskaya ◽

...

Keyword(s):

Interspecific Hybrids ◽

Relative Weight ◽

Physiological Status ◽

Morphophysiological Indicators ◽

Sturgeon Species ◽

Experimental Base ◽

Acipenser Nudiventris ◽

Second Year ◽

Growing Conditions ◽

Land Vertebrates

The objects of research are Beluga (Huso huso, Linnaeus), sturgeon spike (Acipenser nudiventris, Lovetsky) and their interspecific hybrids of artificial generation grown on the Research and Experimental Base BIOS (the Astrakhan region) by using the basin method. To assess the physiological status of fish, a set of morphophysiological indicators (absolute and relative weight of gills, heart, liver, and gonads) were used. The dynamics of the indices of the corresponding viscera of Beluga and sturgeon spike and their interspecific hybrids in the second year of cultivation was studied. The necessity for the research is explained by the fact that most work performed was carried out on land vertebrates and on fish of natural generation. There have been presented the average values of morphophysiological indices for each of the four groups of unmixed sturgeon species and their hybrids. The obtained values of the studied parameters of sturgeon species can be used for further monitoring of the fish growing conditions using the basin method.

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Genetic Variation and Heritability Estimates for Bunch Yield, Bunch Components and Vegetative Traits in Oil Palm Interspecific Hybrids

Journal of Agricultural Science and Technology A ◽

10.17265/2161-6256/2015.03.002 ◽

2015 ◽

Vol 5 (3) ◽

Cited By ~ 1

Author(s):

Mohd Din Amiruddin ◽

Rajanaidu Nookiah ◽

Jalani Sukaimi ◽

Zakri Abdul Hamid

Keyword(s):

Genetic Variation ◽

Oil Palm ◽

Interspecific Hybrids ◽

Vegetative Traits ◽

Heritability Estimates ◽

Bunch Yield

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Genetic Variation and Phylogeny of Wabisuke Camellias by Amplified Fragment Length Polymorphism (AFLP) Analysis

Agronomy ◽

10.3390/agronomy11101974 ◽

2021 ◽

Vol 11 (10) ◽

pp. 1974

Author(s):

Jung-Hee Kim ◽

Itsumi Koike ◽

Toshiki Nakashima ◽

Michikazu Hiramatsu ◽

Ikuo Miyajima ◽

...

Keyword(s):

Genetic Variation ◽

Genetic Polymorphism ◽

Length Polymorphism ◽

Fragment Length ◽

Interspecific Hybrids ◽

Fragment Length Polymorphism ◽

Amplified Fragment Length Polymorphism ◽

Aflp Analysis ◽

Camellia Japonica ◽

Camellia Species

Amplified fragment length polymorphism (AFLP) analysis was conducted on the wabisuke camellia and its relative camellia species. Genetic polymorphism was identified among the ‘Uraku’ camellia, its offspring ‘Tosa-uraku’ and Camellia japonica, whereas the two accessions of the old ‘Uraku’ showed monomorphism in all the fragments. The results suggested that the two old ‘Uraku’ trees are asexually-propagated clonal strains. The genetic distance between wabisuke cultivars and Chinese camellias and between wabisuke camellias and C. sinensis was much further than that between wabisuke cultivars and Camellia japonica. It has also been suggested that wabisuke camellias can be classified into two subgroups, I-1 and I-2, and that Subgroup I-2 originated from C. japonica, while Subgroup I-1, including ‘Uraku’ (synonym: ‘Tarokaja’), was developed by the repeated hybridization of C. japonica to interspecific hybrids with the Chinese camellias, e.g., C. pitardii var. pitardii, or by the involvement of related species not investigated in this study.

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