Euphytica

, 165:55

Natural variation in fruit abscission-related traits in apple (Malus)

  • Lingxia Sun
  • M. John Bukovac
  • Philip L. Forsline
  • Steven van Nocker
Article

DOI: 10.1007/s10681-008-9754-x

Cite this article as:
Sun, L., John Bukovac, M., Forsline, P.L. et al. Euphytica (2009) 165: 55. doi:10.1007/s10681-008-9754-x

Abstract

Abscission or retention of ripening fruit is a major component of seed dispersal strategies and also has important implications for horticultural production. Abscission-related traits have generally not been targeted in breeding efforts, and their genetic bases remain mostly unknown. We evaluated 144 Malus accessions representing wild species, domestic cultivars, and hybrids for abscission-related traits. We found that seasonal timing of fruit abscission in wild species and hybrids showed a broad distribution similar to that seen for domestic cultivars, and that internal ethylene concentration at the time of abscission varied by over three orders of magnitude. Wild species, domestic cultivars, and hybrids all included representatives that showed abscission of fruit prior to substantial production of ethylene, as well as accessions that retained fruit for a significant period of time following ethylene production. For all accessions that retained fruit, fruit removal resulted in abscission of the pedicel, and exogenous ethylene promoted abscission, suggesting that the abscission zone was functional. Our results suggest important roles for mechanisms independent of fruit ethylene production in abscission.

Keywords

Malus Abscission Fruit ripening Ethylene Natural diversity 

Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • Lingxia Sun
    • 1
  • M. John Bukovac
    • 1
  • Philip L. Forsline
    • 2
  • Steven van Nocker
    • 1
  1. 1.Department of HorticultureMichigan State UniversityEast LansingUSA
  2. 2.Plant Genetic Resources Unit, USDA Agricultural Research ServiceCornell UniversityGenevaUSA

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