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Rose Breeding Selects More Total Floral Organs, a Trait Linked to CLAVATA3 Expression.

Dan Wang1,2, Ye Liu3,4, Yan-Hong Zeng5

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Modern rose breeding shows increased floral organs, linked to CLAVATA3 (CLV3) gene expression. This study reveals CLV3

Keywords:
CLAVATA3breedingmeristem sizerosetotal floral organ number

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Area of Science:

  • Plant Science
  • Genetics
  • Developmental Biology

Background:

  • Roses exhibit significant floral organ diversity, particularly petal number, a key trait in breeding.
  • Modern rose varieties display a notable increase in floral organs compared to traditional ones.

Purpose of the Study:

  • To investigate the variation in floral organ number across diverse rose lines.
  • To explore the role of CLAVATA3 (CLV3) and APETALA2 (AP2) in regulating floral organ number in roses.

Main Methods:

  • Phenome analysis of 132 rose lines.
  • Gene expression analysis of CLV3 in relation to floral organ number.
  • Genetic alteration of CLV3 expression in roses and Arabidopsis.
  • Exogenous application of CLV3-encoded CLE peptide.

Main Results:

  • Modern roses have approximately 36% more floral organs than traditional varieties.
  • CLV3 expression inversely correlates with total floral organ number.
  • Altering CLV3 expression affects meristem size and floral organ development.
  • Rose CLV3 peptide reduces meristem size and root length in both rose and Arabidopsis.

Conclusions:

  • CLV3 expression diversity is a key factor in rose floral organ number variation.
  • CLV3 may act with AP2 variation to control floral organ number.
  • Findings offer insights into floral development mechanisms in roses and ornamental plants.