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While it is unclear how molecules move between adjacent Golgi cisternae, it is apparent that the molecules move from cis- cisterna, the entry face, to the trans- cisterna, the exit face. Experiments initially suggested vesicles that bud from one cisterna and fuse with the next cisterna to transport proteins between the cisternae. This vesicular transport model describes the Golgi apparatus as a relatively static structure with a unique enzyme composition in each cisterna. Molecules are...
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Understanding the Saffron Corm Development-Insights into Histological and Metabolic Aspects.

Claudia Pallotti1,2, Begoña Renau-Morata1,3, Loriana Cardone4

  • 1Departamento de Producción Vegetal, Universitat Politècnica de València, Camino de Vera s.n., 46022 Valencia, Spain.

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Saffron corm growth relies on carbohydrate allocation and meristem activity. Daughter corm (DC) development stops when mother corm (MC) root biomass declines, impacting water supply and leaf aging.

Keywords:
Crocus sativuscarbohydrate metabolismcorm growthmeristemssource–sink relationshipsvascular connections

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Area of Science:

  • Plant Physiology
  • Agricultural Science
  • Molecular Biology

Background:

  • Crocus sativus L. reproduction depends on corms; daughter corm (DC) development is fueled by photoassimilates from leaves and mother corms (MC).
  • While biomass partitioning is understood, corm growth dynamics, including cell proliferation, size, meristems, and carbohydrate allocation, require further investigation.

Purpose of the Study:

  • To comprehensively investigate saffron corm growth dynamics at macroscopic and microscopic levels.
  • To elucidate the correlation between corm growth phases, cell dynamics, and carbohydrate partitioning.
  • To identify key meristems and understand their roles in corm development.

Main Methods:

  • Macroscopic and microscopic analysis of saffron corm growth.
  • Measurement of carbohydrate content and enzyme activities related to sucrose metabolism.
  • Identification and characterization of key meristems involved in corm development.

Main Results:

  • Two critical meristems identified: one for vascular connections and a thickening meristem for DC enlargement.
  • DC growth cessation linked to reduced MC root biomass, limiting water supply and initiating leaf wilting.
  • Sucrose synthase identified as crucial for carbon flux to starch synthesis in DCs; aged leaf cells show lipid accumulation, not starch.

Conclusions:

  • Saffron corm development is intricately linked to meristem activity, carbohydrate partitioning, and mother corm resource availability.
  • Sugars may play a signaling role in DC growth initiation, cessation, and leaf senescence.
  • Understanding these dynamics can inform strategies for improved saffron corm development and yield.