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Euphytica

, Volume 103, Issue 2, pp 243–250 | Cite as

Germination and net in vitro growth of peach, almond and peach-almond hybrid embryos in response to mannitol inclusion in the nutrient medium

  • Craig A. Ledbetter
  • Debra E. Palmquist
  • Sharon J. Peterson
Article

Abstract

Nine Prunus accessions were evaluated for germination and plantlet growth in an in vitro osmotic screening test using mannitol as an osmoticum. Embryos from diverse peaches, almonds and peach-almond hybrids were cultured in Woody Plant Medium, and in this same medium modified with the inclusion of 350 mM mannitol. Embryos were stratified in vitro for 60 days, induced to germinate for a two week period and then allowed to develop and grow for another 20 days prior to harvest. Fresh weights of both roots and shoots as well as percent germination were recorded at harvest. The main effects of nutrient medium, germplasm type (peach, peach-almond, almond) and specific Prunus accession were all highly significant (P = 0.01) with regard to fresh weight of roots and shoots. Embryo germination was affected significantly by the inclusion of mannitol in the nutrient medium and by the particular germplasm type (P=0.01 and P=0.05, respectively). Significant interactions of nutrient medium × Prunus accession and nutrient medium × germplasm type were also detected for both root and shoot fresh weights. Almond germplasm cultured in Woody Plant Medium with 350 mM mannitol produced significantly more roots and shoots than either peaches or peach-almond hybrids grown in the same medium. Peach-almond hybrid embryos were observed to germinate at a significantly higher frequency than peach embryos when averaged across both media. Results obtained in this study indicate a wide range of average plantlet fresh weight relative to the specific germplasm challenged in the osmotic screen.

drought tolerant embryo culture Prunus rootstock screening seed-propagated water deficit 

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Copyright information

© Kluwer Academic Publishers 1998

Authors and Affiliations

  • Craig A. Ledbetter
    • 1
  • Debra E. Palmquist
    • 2
  • Sharon J. Peterson
    • 1
  1. 1.United States Department of AgricultureAgricultural Research Service, Horticultural Crops Research LaboraroryFresnoU.S.A
  2. 2.United States Department of AgricultureAgricultural Research Service, Ecology of Temperate Desert RangelandsRenoU.S.A

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