In Vivo Pollen Tube Growth and Evidence of Self-Pollination and Prefloral Anthesis in cv. Macabeo ( Vitis vinifera L.)

Francisco García-Breijo, José Reig Armiñana, Alfonso Garmendia, Nuria Cebrián, Roberto Beltrán and Hugo Merle
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Francisco García-Breijo: Departamento de Ecosistemas Agroforestales, Universitat Politècnica de València, 46022 Valencia, Spain
José Reig Armiñana: Instituto Cavanilles de Biodiversidad y Biología Evolutiva, Universidad de Valencia, 46010 Valencia, Spain
Alfonso Garmendia: Instituto Agroforestal Mediterráneo, Universitat Politècnica de València, 46022 Valencia, Spain
Nuria Cebrián: Departamento de Ecosistemas Agroforestales, Universitat Politècnica de València, 46022 Valencia, Spain
Roberto Beltrán: Departamento de Ecosistemas Agroforestales, Universitat Politècnica de València, 46022 Valencia, Spain
Hugo Merle: Departamento de Ecosistemas Agroforestales, Universitat Politècnica de València, 46022 Valencia, Spain

Agriculture, 2020, vol. 10, issue 12, 1-13

Abstract: Cultivar Macabeo is one of the most planted white grape varieties of northern Spain. A general agreement supports many Vitis vinifera cultivars possibly being self-fertile, although this seems to be a variety-dependent characteristic. No previous information about the mating system of cv. Macabeo was found. This study aimed to analyze its mating system and to compare the in vivo fertilization process with and without artificial cross-pollination. Two treatments were performed: emasculation and cross-pollination. The seed number was counted, and pollen tube growth was observed by microscopy. The results showed that cv. Macabeo is self-fertile and selfing probably occurs before the flower opens. Pollen was found over the stigma of flowers before capfall and ovule fertilization was observed even in emasculated flowers, which suggests that germination and pollen tube growth happened in a very early flower development stage. Cross-pollination increased the presence of the pollen tubes growing inside flowers but was not necessary for fruit set. Ovule fertilization was very fast as 24 h (h) were enough for pollen tubes to reach the end of stylar canals.

Keywords: self-pollination; cleistogamy; pollen tube; Macabeo; Viura (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:gam:jagris:v:10:y:2020:i:12:p:647-:d:464542

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