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Related Concept Videos

Fruit Development, Structure, and Function01:58

Fruit Development, Structure, and Function

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Fruits form from a mature flower ovary. As seeds develop from the ovules contained within, the ovary wall undergoes a series of complex changes to form fruit. In some fruits, such as soybeans, the ovary wall dries; in other fruits, such as grapes, it remains fleshy. In some cases, organs other than the ovary contribute to fruit formation; such fruits are called accessory fruits.
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Sporulation is a complex developmental process that allows certain Gram-positive bacteria, such as Bacillus subtilis and Clostridium species, to survive extreme environmental conditions. This process is tightly regulated by a series of signaling cascades and transcriptional controls, ensuring the formation of a highly resistant endospore.Sporulation is triggered by unfavorable conditions, such as nutrient depletion, and is governed by a phosphorelay system. One of the sensor kinases, such as...
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Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
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Related Experiment Video

Updated: Apr 30, 2026

Tomato Analyzer: A Useful Software Application to Collect Accurate and Detailed Morphological and Colorimetric Data from Two-dimensional Objects
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Genetic regulation and structural changes during tomato fruit development and ripening.

Paolo Pesaresi1, Chiara Mizzotti1, Monica Colombo2

  • 1Dipartimento di Bioscienze, Università degli Studi di Milano Milano, Italy.

Frontiers in Plant Science
|May 6, 2014
PubMed
Summary

Fruit maturation involves significant plastid changes, like chloroplasts becoming chromoplasts. This process likely involves communication between plastids and the nucleus through signaling pathways.

Keywords:
fruit developmentplastidretrograde and anterograde signalingripeningtomato

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Area of Science:

  • Plant biology
  • Developmental biology
  • Evolutionary botany

Background:

  • Fruits are crucial for angiosperm reproduction, protecting and dispersing seeds.
  • Fruits are classified as dry or fleshy, with fleshy fruits attracting animals for seed dispersal.
  • Fruit ripening involves cytological changes, notably plastid alterations like chloroplast dedifferentiation into chromoplasts.

Purpose of the Study:

  • To review the role of plastid modifications during fruit maturation and ripening.
  • To explore the potential involvement of organelle-nucleus crosstalk in these processes.

Main Methods:

  • Literature review focusing on plastid biology and fruit development.
  • Analysis of signaling pathways (retrograde and anterograde) in organelle-nucleus communication.

Main Results:

  • Plastid modifications, particularly the transition from chloroplasts to chromoplasts, are key events in fruit ripening.
  • Coordination of nuclear and plastid genomes is essential for plastid biogenesis and remodeling.
  • Retrograde and anterograde signaling pathways are implicated in mediating communication between plastids and the nucleus.

Conclusions:

  • Plastid modifications are integral to fruit maturation and ripening.
  • Organelle-nucleus crosstalk, via retrograde and anterograde signaling, likely plays a critical role in regulating these developmental processes.