Arabidopsis CDKA;1, a cdc2 hom*ologue, controls proliferation of generative cells in male gametogenesis. | Semantic Scholar (2024)

It is shown that BICE1 encodes a plant hom*olog of human D123 protein that is required for G1 progression, but the underlying mechanism is unknown, and that Bice1 interacts with MCM4 and MCM7 of the pre-replication complex.

This work identifies a novel F-box protein of Arabidopsis thaliana, designated FBL17 (F-box-like 17), that enables this switch in cell cycle control by targeting the degradation of cyclin-dependent kinase A;1 inhibitors specifically in male germ cells.

This study identifies a novel component required for sperm cell formation in plants and uncovers a direct positive regulatory role of ARID1 on DUO1 through association with histone acetylation.

It is shown in Arabidopsis thaliana that loss of activity of the Chromatin assembly factor 1 (CAF1) pathway causes delay and arrest of the cell cycle during pollen development, suggesting that pollen cell fate is independent from cell cycle regulation.

It is reported that FBL17, an Arabidopsis thaliana F-box protein, is involved in cell cycle regulation during male gametogenesis, and expression is strongly enhanced in plants co-expressing E2Fa and DPa, transcription factors that promote S-phase entry.

It is observed that hyperproliferation caused by the loss of Rb protein prevents or delays cell determination during plant male gametogenesis, providing further evidence for a direct link between fate determination and cell proliferation.

It is demonstrated that MYB81 has a key role in the developmental progression of microspores, enabling formation of the two male cell lineages that are essential for sexual reproduction in Arabidopsis.

It is shown that sperm entry was sufficient to trigger central cell mitotic division, suggesting the existence of signaling events associated with sperm cell fusion with female gametes, and that the paternal genome plays an essential role during early seed development.

The analysis of male germline development in pollen of wild-type Arabidopsis and in four allelic duo1 mutants expressing introduced cell markers shows that the undivided GC in duo1 pollen forms a cytoplasmic projection, but the cell body fails to elongate.

...

...

It is shown that, in plants, the developmental controls defining shape can act independently from cell division rates, and Morphogenesis, histogenesis and developmental timing were unaffected.

It is shown that HUA ENHANCER3 (HEN3), which encodes CDKE, a hom*olog of mammalian CDK8, is required for the specification of stamen and carpel identities and for the proper termination of stem cells in the floral meristem, and plays a role in cell differentiation in a multicellular organism.

Arabidopsis retinoblastoma protein hom*ologue RBR1 has a novel and previously unrecognized function in cell cycle control during gametogenesis and in the repression of autonomous endosperm development.

An Arabidopsis mutant, named tardy asynchronous meiosis (tam), that exhibits a phenotype of delayed and asynchronous cell divisions during male meiosis is described, suggesting that the TAM protein positively regulates cell cycle progression, perhaps by promoting the G2/M transition.

The role of CDKB in Ostreococcus, a unicellular green algae with a minimal set of cell cycle genes, suggests that from a major role in the control of mitosis in green algae, CDKB has evolved in higher plants to assume other functions outside the cell cycle.

These results identify two essential gametophytic loci required for progression through different phases of the generative cell cycle, providing the first evidence to the authors' knowledge for genetic regulators of male germ line development in flowering plants.

It is found that unfertilized endosperm developed, suggesting that a previously unrecognized positive signal from the fertilization of the egg cell initiates proliferation of the central cell.

The results revealed that the 595bp fragment lacks cis element(s) essential for proliferating-cell-specific promoter activity, but can direct transcription in a specific period during trichome development, which does not include cell division, suggesting that CDKA;1 functions during cell morphogenesis as well as cell proliferation.

It is shown that the CDKB1;1 gene of Arabidopsis (Arabidopsis thaliana) is highly expressed in guard cells and stomatal precursor cells of cotyledons, suggesting a prominent role for B-type CDKs in stomata development, and illustrating that stomatic cell differentiation is independent of cellular and nuclear division.

...

...