Specific features of early embryogenesis in apomictic Poa pratensis L.

Yudakova, O. I.; Шакина, Т. Н.

doi:10.1134/s1062360407010018

Cited by 4 publications

(2 citation statements)

References 5 publications

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“…Even though this was not directly investigated previously, preferential asexual embryo formation in the micropylar region also appears to be the case in some aposporous grasses studied, for example, Poa pratensis and Panicum maximum. 21,22 This implies that possibly maternally derived developmental and nutritional cues within the ovule, which have evolved to support the micropylar position of the sexually derived Polygonum-type embryo sac, may also be important for seeds formed via the apomictic pathway in some eudicot and monocot apomicts.…”

Section: Textmentioning

confidence: 99%

Phenotypic plasticity of aposporous embryo sac development in Hieracium praealtum

Juranić

Johnson

Koltunow

2019

Plant Signaling & Behavior

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Apomixis in Hieracium praealtum follows a developmental pathway of apospory, where an unreduced embryo sac develops from a somatic ovule cell without meiosis. The avoidance of meiosis together with fertilization-independent seed formation leads to clonal progeny genetically identical to the maternal plant. We have previously described the initial developmental steps of aposporous embryo sac formation in H. praealtum and here, we cytologically observed more than 500 ovules with a focus on the later stages of embryo sac maturation. Aposporous embryo sac maturation is a stochastic process in H. praealtum with single or multiple embryo sacs formed, in addition to off-types and embryo sac abortion. The frequency of twin embryo sacs growing at the same rate is a rare event and, in most ovules, the additional embryo sac undergoes developmental arrest suggesting dominance or growth promotion of a single embryo sac. Observed deviations from the Polygonum-type embryo sac in H. praealtum indicate developmental plasticity during embryo sac maturation. Nevertheless, fertilizationindependent seed formation successfully occurs.

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Section: Textmentioning

confidence: 99%

Phenotypic plasticity of aposporous embryo sac development in Hieracium praealtum

Juranić

Johnson

Koltunow

2019

Plant Signaling & Behavior

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“…Based on the observation of the pollination and fertilization process in Kentucky bluegrass, this study found that early embryogenesis in Kentucky bluegrass was influenced by the existence of apomixis. During the early stage of early embryogenesis, the development of sexual embryos was relatively conservative [41]. It was also observed that Kentucky bluegrass has a bifid feathery stigma, which exhibited a good ability to receive pollen (Figure 4).…”

Section: Pollination Fertilization and Seed Development Of Wild Kentu...mentioning

confidence: 97%

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

Zhang

2023

Agronomy

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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.

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Asynchronous male/female gametophyte development in facultative apomictic plants of Cenchrus ciliaris (Poaceae)

Sharma

Geeta

Bhat

2014

South African Journal of Botany

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Specific features of early embryogenesis in apomictic Poa pratensis L.

Cited by 4 publications

References 5 publications

Phenotypic plasticity of aposporous embryo sac development in Hieracium praealtum

Phenotypic plasticity of aposporous embryo sac development in Hieracium praealtum

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

Asynchronous male/female gametophyte development in facultative apomictic plants of Cenchrus ciliaris (Poaceae)

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