TY  - JOUR
AU  - Janković, Slađana
AU  - Stanković, Jelena
AU  - Janković, Dragan
AU  - Milatović, Dragan
PY  - 2021
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5910
AB  - The morphological characteristics of female flowers and their parts in six walnut genotypes were described. The number of female flowers per inflorescence ranged from 1.9 to 2.7. The length and width of female flowers were 8.0–10.1 mm, and 3.4–3.8 mm, respectively. The average length and width of the ovule for all genotypes was 0.55 mm. The largest width of the ovule was 0.59 mm in the cultivar ‘Sheynovo’, and the smallest 0.51 mm in the cultivar ‘Geisenheim 139’. A significant positive correlation was found between the length and width of female flowers (r = 0.34⁎) and between the length and width of ovules (r = 0.57⁎⁎). Also, a significant negative correlations were found between the length of female flowers and the number of female flowers in the inflorescence (−0.58⁎⁎), and between the beginning of flowering and the duration of flowering (r = −0.66⁎⁎). The average width of the megaspore for all genotypes was 13.7 μm and of the mature embryo sac 70.2 μm. The average length of the mature embryo sac was 78.1 μm. The female flower morphogenesis occurred successively and in the same order in all examined genotypes. The differences by years and between genotypes referred to the time of onset and duration of the development stages. The characteristic phases of the female flower morphogenesis are described, and their dynamics are shown graphically for each genotype. The type of dichogamy had a significant influence on the rate of flower development. A high degree of concordance was found between the phases of female flower development and the stages of megasporogenesis and megagametogenesis. The paper presents photographs of comparative developmental stages that enable the assessment of the phases of megasporogenesis and megagametogenesis according to external morphological changes on female flowers and ovules.
PB  - Elsevier B.V.
T2  - Scientia Horticulturae
T1  - Morphology and morphogenesis of female reproductive organs in some walnut (Juglans regia L.) genotypes
SP  - 110471
VL  - 289
DO  - 10.1016/j.scienta.2021.110471
ER  - 

@article{
author = "Janković, Slađana and Stanković, Jelena and Janković, Dragan and Milatović, Dragan",
year = "2021",
abstract = "The morphological characteristics of female flowers and their parts in six walnut genotypes were described. The number of female flowers per inflorescence ranged from 1.9 to 2.7. The length and width of female flowers were 8.0–10.1 mm, and 3.4–3.8 mm, respectively. The average length and width of the ovule for all genotypes was 0.55 mm. The largest width of the ovule was 0.59 mm in the cultivar ‘Sheynovo’, and the smallest 0.51 mm in the cultivar ‘Geisenheim 139’. A significant positive correlation was found between the length and width of female flowers (r = 0.34⁎) and between the length and width of ovules (r = 0.57⁎⁎). Also, a significant negative correlations were found between the length of female flowers and the number of female flowers in the inflorescence (−0.58⁎⁎), and between the beginning of flowering and the duration of flowering (r = −0.66⁎⁎). The average width of the megaspore for all genotypes was 13.7 μm and of the mature embryo sac 70.2 μm. The average length of the mature embryo sac was 78.1 μm. The female flower morphogenesis occurred successively and in the same order in all examined genotypes. The differences by years and between genotypes referred to the time of onset and duration of the development stages. The characteristic phases of the female flower morphogenesis are described, and their dynamics are shown graphically for each genotype. The type of dichogamy had a significant influence on the rate of flower development. A high degree of concordance was found between the phases of female flower development and the stages of megasporogenesis and megagametogenesis. The paper presents photographs of comparative developmental stages that enable the assessment of the phases of megasporogenesis and megagametogenesis according to external morphological changes on female flowers and ovules.",
publisher = "Elsevier B.V.",
journal = "Scientia Horticulturae",
title = "Morphology and morphogenesis of female reproductive organs in some walnut (Juglans regia L.) genotypes",
pages = "110471",
volume = "289",
doi = "10.1016/j.scienta.2021.110471"
}

Janković, S., Stanković, J., Janković, D.,& Milatović, D.. (2021). Morphology and morphogenesis of female reproductive organs in some walnut (Juglans regia L.) genotypes. in Scientia Horticulturae
Elsevier B.V.., 289, 110471.
https://doi.org/10.1016/j.scienta.2021.110471

Janković S, Stanković J, Janković D, Milatović D. Morphology and morphogenesis of female reproductive organs in some walnut (Juglans regia L.) genotypes. in Scientia Horticulturae. 2021;289:110471.
doi:10.1016/j.scienta.2021.110471 .

Janković, Slađana, Stanković, Jelena, Janković, Dragan, Milatović, Dragan, "Morphology and morphogenesis of female reproductive organs in some walnut (Juglans regia L.) genotypes" in Scientia Horticulturae, 289 (2021):110471,
https://doi.org/10.1016/j.scienta.2021.110471 . .

TY  - JOUR
AU  - Milatović, Dragan
AU  - Nikolić, Dragan
AU  - Janković, Sladana
AU  - Janković, Dragan
AU  - Stanković, Jelena
PY  - 2020
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5250
AB  - Morphological characteristics of male reproductive organs (catkins, male flowers, anthers, and pollen) were studied in six walnut genotypes. Morphology and ultrastructure of pollen grains were studied using scanning electron microscopy (SEM) technique. Numbers of catkins per shoot and node ranged 2.35-5.61, and 0.29-0.73, respectively. They were higher in protandrous genotypes, compared with protogynous ones. The average values for catkin characteristics for all genotypes were: length 120 mm, width 15 mm, and the number of male flowers in catkin 120. Catkin length was higher in genotypes with the later time of pollen shedding. The average number of stamens in a male flower for all genotypes was 19, while average anther dimensions were: length 2.32 mm, width 0.96 mm, and thickness 0.75 mm. Significant differences between genotypes were found for all catkin and anther characteristics, except for catkin width. Pollen grains of all examined walnut genotypes were isopolar and pantoporate. They are classified as medium-large in size, with the average length of the polar axis (P) 36.84-39.88 mu m, and the average length of the equatorial axis (E) 43.12-46.37 mu m. The average P/E ratio varied between 0.85 and 0.88 and, based on this, pollen shape was identified as suboblate. All studied genotypes had microechinate exine ornamentation. The number of microechini per an area of 100 mu m(-2) of the exine surface varied between 22 and 25. Results obtained by SEM examination indicated that some pollen characteristics, such as size, shape, and microechini density can potentially be used in the identification of walnut genotypes.
PB  - Elsevier, Amsterdam
T2  - Scientia Horticulturae
T1  - Morphological characteristics of male reproductive organs in some walnut (Juglans regia L.) genotypes
VL  - 272
DO  - 10.1016/j.scienta.2020.109587
ER  - 

@article{
author = "Milatović, Dragan and Nikolić, Dragan and Janković, Sladana and Janković, Dragan and Stanković, Jelena",
year = "2020",
abstract = "Morphological characteristics of male reproductive organs (catkins, male flowers, anthers, and pollen) were studied in six walnut genotypes. Morphology and ultrastructure of pollen grains were studied using scanning electron microscopy (SEM) technique. Numbers of catkins per shoot and node ranged 2.35-5.61, and 0.29-0.73, respectively. They were higher in protandrous genotypes, compared with protogynous ones. The average values for catkin characteristics for all genotypes were: length 120 mm, width 15 mm, and the number of male flowers in catkin 120. Catkin length was higher in genotypes with the later time of pollen shedding. The average number of stamens in a male flower for all genotypes was 19, while average anther dimensions were: length 2.32 mm, width 0.96 mm, and thickness 0.75 mm. Significant differences between genotypes were found for all catkin and anther characteristics, except for catkin width. Pollen grains of all examined walnut genotypes were isopolar and pantoporate. They are classified as medium-large in size, with the average length of the polar axis (P) 36.84-39.88 mu m, and the average length of the equatorial axis (E) 43.12-46.37 mu m. The average P/E ratio varied between 0.85 and 0.88 and, based on this, pollen shape was identified as suboblate. All studied genotypes had microechinate exine ornamentation. The number of microechini per an area of 100 mu m(-2) of the exine surface varied between 22 and 25. Results obtained by SEM examination indicated that some pollen characteristics, such as size, shape, and microechini density can potentially be used in the identification of walnut genotypes.",
publisher = "Elsevier, Amsterdam",
journal = "Scientia Horticulturae",
title = "Morphological characteristics of male reproductive organs in some walnut (Juglans regia L.) genotypes",
volume = "272",
doi = "10.1016/j.scienta.2020.109587"
}

Milatović, D., Nikolić, D., Janković, S., Janković, D.,& Stanković, J.. (2020). Morphological characteristics of male reproductive organs in some walnut (Juglans regia L.) genotypes. in Scientia Horticulturae
Elsevier, Amsterdam., 272.
https://doi.org/10.1016/j.scienta.2020.109587

Milatović D, Nikolić D, Janković S, Janković D, Stanković J. Morphological characteristics of male reproductive organs in some walnut (Juglans regia L.) genotypes. in Scientia Horticulturae. 2020;272.
doi:10.1016/j.scienta.2020.109587 .

Milatović, Dragan, Nikolić, Dragan, Janković, Sladana, Janković, Dragan, Stanković, Jelena, "Morphological characteristics of male reproductive organs in some walnut (Juglans regia L.) genotypes" in Scientia Horticulturae, 272 (2020),
https://doi.org/10.1016/j.scienta.2020.109587 . .