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Ripening of Pomegranate Skin as Revealed by Developmental Transcriptomics.

Idit Ginzberg1, Adi Faigenboim1

  • 1Institute of Plant Sciences, Agricultural Research Organization, Volcani Institute, 68 HaMacabim Road, P.O. Box 15159, Rishon LeZion 7505101, Israel.

Cells
|July 27, 2022
PubMed
Summary
This summary is machine-generated.

Pomegranate fruit ripening involves ethylene, polyamine, and jasmonic acid pathways, differing from strawberry ripening. Key genes for red pigments and tannins are upregulated, while skin hardening involves lignification.

Keywords:
Punica granatumanthocyaninfruit peelhydrolyzable tanninnon-climacteric fruitplant growth regulator

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Area of Science:

  • Plant Biology
  • Fruit Ripening Physiology
  • Molecular Genetics

Background:

  • Pomegranate (Punica granatum L.) fruit appearance is crucial for marketability, with red pigment accumulation and minimal skin cracking as key traits.
  • Understanding pomegranate fruit ripening is essential, especially given its non-climacteric nature, which contrasts with model systems like strawberry.

Purpose of the Study:

  • To analyze the pomegranate fruit skin transcriptome during development.
  • To characterize ripening processes in pomegranate skin and identify regulatory pathways.
  • To investigate the genetic basis of coloration and skin integrity.

Main Methods:

  • Transcriptome sequencing of pomegranate cv. Wonderful skin at different developmental stages.
  • Analysis of gene expression patterns related to pigment biosynthesis, cell wall modification, and hormone signaling.
  • Comparative analysis with known fruit ripening models.

Main Results:

  • Pomegranate ripening appears to involve ethylene, polyamine, and jasmonic acid pathways, distinct from abscisic acid-driven ripening in strawberries.
  • Biosynthesis pathways for hydrolyzable tannins and anthocyanins were co-upregulated during ripening, correlating with increased red coloration.
  • Cuticle and cell wall-related genes were upregulated in early fruit development, with potential involvement of lignification in mature fruit skin hardening.

Conclusions:

  • Pomegranate ripening involves unique molecular pathways, highlighting its non-climacteric status.
  • Transcriptomic data provides insights into the genetic control of desirable fruit traits like color and skin quality.
  • Further research into lignification could inform strategies to prevent fruit cracking.