Abnormalities of female gametophyte development in apomictic bluegrass forms

Yudakova, O. I.

doi:10.1134/s1062360409030035

Cited by 4 publications

(5 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Apomictic forms of angiosperms are especially intriguing in this regard as their reproductive structures often exhibit various abnormalities [10]. Comparative analysis of the gametophytic variation rate in apomictic and sexual cereal species indicates a regular pattern of abnormalities in apomixis [10]. Based on such apomictic evidence, our main hypothesis is that anatomical analysis of sporogenesis and gametogenesis development can ontogenetically confirm embryo sac origin in Kentucky bluegrass.…”

Section: Introductionmentioning

confidence: 88%

“…Embryologists are particularly interested in developmental abnormalities as their understanding can shed light on the mechanisms of ontogenetic processes. Apomictic forms of angiosperms are especially intriguing in this regard as their reproductive structures often exhibit various abnormalities [10]. Comparative analysis of the gametophytic variation rate in apomictic and sexual cereal species indicates a regular pattern of abnormalities in apomixis [10].…”

Section: Introductionmentioning

confidence: 99%

“…Reproduction studies, particularly embryology, represent basic information of any plant [12]. Due to its desirable traits and considerable importance as a turfgrass and a "model species" of apomixis research [10], it is necessary to study Kentucky bluegrass's reproductive characteristics, which may provide a scientific basis for further exploration and utilization of the species. Thus, this study is significant for the research that aims to comprehend the development of apomixis in Kentucky bluegrass and reveal the genetic mechanism of apomixis.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Cyto-Embryological Analysis of Wild Kentucky Bluegrass Germplasm in Gansu Province, China

Zhang

2023

Agronomy

View full text Add to dashboard Cite

Reproduction studies, particularly embryology, represent basic information of any plant. However, the current embryological information is fragmentary for Kentucky bluegrass (Poa pratensis L.). Here, paraffin sections were used to examine the cyto-embryological characteristics, including microsporogenesis, microgametogenesis, megasporogenesis, megagametogenesis, and apomixis, of wild Kentucky bluegrass germplasm from Gannan (GN) and Longnan (LN) in Gansu Province. The study found no significant differences in pollen diameter, characteristics, viability, and stigma receptivity between the two germplasm materials. The Kentucky bluegrass consisted of three anthers, and each contained four pollen sacs that were divided into left and right halves. After meiosis, the microspore mother cells formed dyads and tetrads, which were primarily symmetrical and underwent mitosis to form three-celled pollen. Kentucky bluegrass has a one-locular ovary, two-feathery stigmas, thick nucleolar and anatropous ovules, and a typical polygonum embryo sac as its reproductive organs. The main type of apomixis observed was apospory, resulting in the coexistence of multiple embryo sacs. Polyembryonic seeds were frequently observed in Kentucky bluegrass due to apospory. Most importantly, our research found that apospory caused early embryogenesis during fertilization, which is a vital embryological feature for identifying sexual reproduction and apomixis in Kentucky bluegrass. Sexual reproduction followed strict double fertilization, while in apomixis a complete seed was only formed through pseudogamy. These embryological characteristics are documented here, and their study can aid in understanding the evolution of Kentucky bluegrass.

show abstract

Section: Introductionmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Cyto-Embryological Analysis of Wild Kentucky Bluegrass Germplasm in Gansu Province, China

Zhang

2023

Agronomy

View full text Add to dashboard Cite

show abstract

“…In Poa chaixii and Poa pratensis (Yudakova 2009), embryos and additional embryo sacs are differentiated from antipodal cells. Seeds containing embryos of various origin and various degree of ploidy play an important role in those plants.…”

Section: Discussionmentioning

confidence: 99%

Generative reproduction of Antarctic grasses, the native species Deschampsia antarctica Desv. and the alien species Poa annua L.

Giełwanowska¹,

Kellmann−Sopyła²

2015

Polish Polar Research

View full text Add to dashboard Cite

Abstract:The embryology of two species, Deschampsia antarctica, a native species, and Poa annua, an alien species in the Antarctic we studied. Flowering buds of plants growing in their natural habitats on King George Island and generative tissues of both plant species grown in a greenhouse were analyzed. Adaptations to autogamy and anemogamy were ob− served in the flower anatomy of both species. The microsporangia of the evaluated grasses produce a small number of three−celled pollen grains. Numerous pollen grains do not leave the microsporangium and germinate in the thecae. Deschampsia antarctica and P. annua plants harvested in Antarctica developed a particularly small number of microspores in pol− len chambers. In D. antarctica, male gametophytes were produced at a faster rate: genera− tive cells in pollen did not become detached from the wall of the pollen grain, they were not embedded in the cytoplasm of vegetative cells, and they divided into two sperm cells situ− ated close to the wall. The monosporous Polygonum type of embryo sac development was observed in the studied species. The egg apparatus had typical polarization, and the filiform apparatus did not develop in synergids. Large antipodals with polyploidal nuclei were formed in the embryo sacs of D. antarctica and P. annua. Poa annua was characterized by numerous antipodal cells which formed antipodal tissue in the chalazal region of the em− bryo sac. Three distinct antipodals with atypical, lateral position in the vicinity of the egg apparatus were observed in D. antarctica. The diaspores of the investigated grass species were characterized by small size, low weight and species−specific primary and secondary sculpture of the testa and caryopsis coat.

show abstract

“…It has been investigated in various crops, other than cassava (Manihot esculenta Crantz), since the 1940s by many authors (Gustafsson, 1946;Brown and Emery, 1958;Nygren, 1967;Nogler, 1984;Hanna and Bashaw, 1987;Asker and Jerling, 1992;Savidan, 1992;Grimanelli et al, 2001;Koltunow and Grossniklaus, 2003;Ozias-Akins, 2006;Yudakova, 2009;Tucker et al, 2012;Hojsgaard et al, 2013). It has been studied in 400 species within 300 genera and 40 plant families of Angiosperms (Carman, 1997;Singh et al, 2011).…”

Section: Some Considerations On Apomixis In Cassavamentioning

confidence: 99%