Let's shape again: the concerted molecular action that builds the pollen tube

Çetinbaş-Genç, Aslıhan; Conti, Veronica; Cai, Giampiero

doi:10.1007/s00497-022-00437-4

Cited by 13 publications

(6 citation statements)

References 247 publications

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“…The process of cell wall deposition and modification depends on the control of vesicular secretion and in turn on a specific organization of the cytoskeleton. All these events rely on a central regulatory system based on membrane receptor proteins, GTPases, calcium ions, intracellular pH gradients, actin-binding proteins, as well as changes in the level of reactive oxygen species (ROS) and phosphoinositides (PI) [18][19][20][21][22][23]. PAs regulate all the above-mentioned aspects of pollen tube growth, as they take part in cell-wall structuring, Ca 2+ and ROS-signaling as well as the organization of the cytoskeleton [3].…”

Section: Polyamines In Pollen Developmentmentioning

confidence: 99%

Male Fertility under Environmental Stress: Do Polyamines Act as Pollen Tube Growth Protectants?

Aloisi

Piccini

Cai

et al. 2022

IJMS

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Although pollen structure and morphology evolved toward the optimization of stability and fertilization efficiency, its performance is affected by harsh environmental conditions, e.g., heat, cold, drought, pollutants, and other stressors. These phenomena are expected to increase in the coming years in relation to predicted environmental scenarios, contributing to a rapid increase in the interest of the scientific community in understanding the molecular and physiological responses implemented by male gametophyte to accomplish reproduction. Here, after a brief introduction summarizing the main events underlying pollen physiology with a focus on polyamine involvement in its development and germination, we review the main effects that environmental stresses can cause on pollen. We report the most relevant evidence in the literature underlying morphological, cytoskeletal, metabolic and signaling alterations involved in stress perception and response, focusing on the final stage of pollen life, i.e., from when it hydrates, to pollen tube growth and sperm cell transport, with these being the most sensitive to environmental changes. Finally, we hypothesize the molecular mechanisms through which polyamines, well-known molecules involved in plant development, stress response and adaptation, can exert a protective action against environmental stresses in pollen by decoding the essential steps and the intersection between polyamines and pollen tube growth mechanisms.

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Section: Polyamines In Pollen Developmentmentioning

confidence: 99%

Male Fertility under Environmental Stress: Do Polyamines Act as Pollen Tube Growth Protectants?

Aloisi

Piccini

Cai

et al. 2022

IJMS

Self Cite

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“…The major targets for study, the pollen tube of Lily and both the pollen tube and root hair of Arabidopsis, have been excellently reviewed ( Cheung and Wu 2011 ; Rounds and Bezanilla 2013 ; Johnson et al 2019 ; Çetinbaş-Genç et al 2022 ). This discussion focuses mostly on root hairs and some of the interesting similarities with cell plate formation.…”

Section: Multiple Structures Involved In Many Functionsmentioning

confidence: 99%

The plant cell wall—dynamic, strong, and adaptable—is a natural shapeshifter

Delmer,

Dixon,

Keegstra

et al. 2024

The Plant Cell

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Mythology is replete with good and evil shapeshifters, who, by definition, display great adaptability and assume many different forms—with several even turning themselves into trees. Cell walls certainly fit this definition as they can undergo subtle or dramatic changes in structure, assume many shapes, and perform many functions. In this review, we cover the evolution of knowledge of the structures, biosynthesis, and functions of the 5 major cell wall polymer types that range from deceptively simple to fiendishly complex. Along the way, we recognize some of the colorful historical figures who shaped cell wall research over the past 100 years. The shapeshifter analogy emerges more clearly as we examine the evolving proposals for how cell walls are constructed to allow growth while remaining strong, the complex signaling involved in maintaining cell wall integrity and defense against disease, and the ways cell walls adapt as they progress from birth, through growth to maturation, and in the end, often function long after cell death. We predict the next century of progress will include deciphering cell type–specific wall polymers; regulation at all levels of polymer production, crosslinks, and architecture; and how walls respond to developmental and environmental signals to drive plant success in diverse environments.

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“…This may explain the presence of a putative aquaporin TIP2-1 (Oleur061Scf0430g00024.1, DELTA-TIP) among the ubiquitous genes that can be regulated by cyclin-B1-2 (Oleur061Scf3133g07005.1) which is also a ubiquitous gene. Ion balance would be required in olive pollen to maintain polarity through microfilament skeleton, signalling, and oxidative status of male gametes, as described in other species [ 10 , 75 ], as well as to preserve the cylindrical shape and osmolarity of growing PT [ 84 , 85 , 86 ], because ions and water are used to fill the new volume and sustain turgor pressure [ 15 ].…”

Section: Discussionmentioning

confidence: 99%

Transcriptomic Insight into the Pollen Tube Growth of Olea europaea L. subsp. europaea Reveals Reprogramming and Pollen-Specific Genes Including New Transcription Factors

Bullones

Castro

Lima-Cabello

et al. 2023

Plants

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The pollen tube is a key innovation of land plants that is essential for successful fertilisation. Its development and growth have been profusely studied in model organisms, but in spite of the economic impact of olive trees, little is known regarding the genome-wide events underlying pollen hydration and growth in this species. To fill this gap, triplicate mRNA samples at 0, 1, 3, and 6 h of in vitro germination of olive cultivar Picual pollen were analysed by RNA-seq. A bioinformatics R workflow called RSeqFlow was developed contemplating the best practices described in the literature, covering from expression data filtering to differential expression and clustering, to finally propose hub genes. The resulting olive pollen transcriptome consisted of 22,418 reliable transcripts, where 5364 were differentially expressed, out of which 173 have no orthologue in plants and up to 3 of them might be pollen-specific transcription factors. Functional enrichment revealed a deep transcriptional reprogramming in mature olive pollen that is also dependent on protein stability and turnover to allow pollen tube emergence, with many hub genes related to heat shock proteins and F-box-containing proteins. Reprogramming extends to the first 3 h of growth, including processes consistent with studies performed in other plant species, such as global down-regulation of biosynthetic processes, vesicle/organelle trafficking and cytoskeleton remodelling. In the last stages, growth should be maintained from persistent transcripts. Mature pollen is equipped with transcripts to successfully cope with adverse environments, even though the in vitro growth seems to induce several stress responses. Finally, pollen-specific transcription factors were proposed as probable drivers of pollen germination in olive trees, which also shows an overall increased number of pollen-specific gene isoforms relative to other plants.

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Let's shape again: the concerted molecular action that builds the pollen tube

Cited by 13 publications

References 247 publications

Male Fertility under Environmental Stress: Do Polyamines Act as Pollen Tube Growth Protectants?

Male Fertility under Environmental Stress: Do Polyamines Act as Pollen Tube Growth Protectants?

The plant cell wall—dynamic, strong, and adaptable—is a natural shapeshifter

Transcriptomic Insight into the Pollen Tube Growth of Olea europaea L. subsp. europaea Reveals Reprogramming and Pollen-Specific Genes Including New Transcription Factors

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