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Sources of parthenocarpy for Zucchini breeding: relationship with ethylene production and sensitivity

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Abstract

Parthenocarpy is becoming an essential trait for off-season greenhouse production of Zucchini squash. Given that winter conditions promote a reduction in the number of male flowers and in the activity of pollinators, the application of synthetic auxins is currently the most widespread method to induce fruit set. We have evaluated the parthenocarpic tendency of 48 long-fruited accessions of Cucurbita pepo spp. pepo, from morphotypes Zucchini, Vegetable marrow and Cocozelle, including 45 traditional cultivars and 3 commercial hybrids, with the goal of identifying new sources of parthenocarpy for breeding programs. After the first screening, 20 selected accessions were evaluated for the growth rate of unpollinated fruit. Twelve of the selected accessions identified as either strongly parthenocarpic or non-parthenocarpic, were compared for fruit rate growth, ethylene production and ethylene sensitivity. Apart from the three control hybrids, the fastest parthenocarpic fruit growth was observed in ‘CpCAL112’, ‘CM-37’, ‘E-27’, ‘PI261610’, and ‘V-185’. The source of the parthenocarpy of some of these accessions differs from that of the hybrids as it was not associated with the conversion of female into bisexual flowers or with the so-called “fruits with attached flowers” syndrome, which is an undesirable trait in current parthenocarpic hybrids. The alternative sources of parthenocarpy may be of great importance in current Zucchini breeding programs. We also demonstrate that the parthenocarpy of these accessions is associated with downregulation of ethylene production in unpollinated fruits during the first days post anthesis (DPA). In non-parthenocarpic accessions, unpollinated fruits boosted ethylene production at 3 DPA, concomitantly with fruit abortion and senescence, while in parthenocarpic accessions, fruits produced little ethylene at 3 DPA. Therefore, ethylene production in ovaries/fruits at 3 DPA can be used as a marker to identify and select parthenocarpy in Zucchini squash. However, in the cultivars tested here, ethylene production and sensitivity in vegetative organs and in male flowers earlier than 3 PDA do not appear well associated with parthenocarpy.

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Authors and Affiliations

  1. Departamento de Biología y Geología, Agrifood Campus of International Excellence (ceiA3), Universidad de Almería, La Cañada de San Urbano s/n, 04120, Almería, Spain

    Cecilia Martínez, Susana Manzano, Zoraida Megías & Manuel Jamilena

  2. Departamento de Fisiología Vegetal, Universidad de Granada, Fuentenueva s/n, 18071, Granada, Spain

    Dolores Garrido

  3. Departamento de Biotecnología, Universidad Politécnica de Valencia, Valencia, Spain

    Belén Picó

Authors
  1. Cecilia Martínez
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  2. Susana Manzano
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  3. Zoraida Megías
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  4. Dolores Garrido
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  5. Belén Picó
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  6. Manuel Jamilena
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Correspondence to Manuel Jamilena.

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Martínez, C., Manzano, S., Megías, Z. et al. Sources of parthenocarpy for Zucchini breeding: relationship with ethylene production and sensitivity. Euphytica 200, 349–362 (2014). https://doi.org/10.1007/s10681-014-1155-8

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