Influence of physical distance between cultivars on yield, outcrossing rate and selective fruit drop in avocado (Persea americana, Lauraceae)
2011; Wiley; Volume: 158; Issue: 3 Linguagem: Inglês
10.1111/j.1744-7348.2011.00469.x
ISSN1744-7348
Autores Tópico(s)Plant and animal studies
ResumoAnnals of Applied BiologyVolume 158, Issue 3 p. 354-361 Influence of physical distance between cultivars on yield, outcrossing rate and selective fruit drop in avocado (Persea americana, Lauraceae) M.L. Alcaraz, M.L. Alcaraz Instituto de Hortofruticultura Subtropical y Mediterránea ‘La Mayora’, Universidad de Málaga-Consejo Superior de Investigaciones Científicas (IHSM-UMA-CSIC), Estación Experimental ‘La Mayora’, 29750 Algarrobo-Costa, Málaga, SpainSearch for more papers by this authorJ.I. Hormaza, Corresponding Author J.I. Hormaza Instituto de Hortofruticultura Subtropical y Mediterránea ‘La Mayora’, Universidad de Málaga-Consejo Superior de Investigaciones Científicas (IHSM-UMA-CSIC), Estación Experimental ‘La Mayora’, 29750 Algarrobo-Costa, Málaga, SpainJ.I. Hormaza, Instituto de Hortofruticultura Subtropical y Mediterránea ‘La Mayora’, Universidad de Málaga-Consejo Superior de Investigaciones Científicas (IHSM-UMA-CSIC), Estación Experimental ‘La Mayora’, 29750 Algarrobo-Costa, Málaga, Spain.E-mail: [email protected]Search for more papers by this author M.L. Alcaraz, M.L. Alcaraz Instituto de Hortofruticultura Subtropical y Mediterránea ‘La Mayora’, Universidad de Málaga-Consejo Superior de Investigaciones Científicas (IHSM-UMA-CSIC), Estación Experimental ‘La Mayora’, 29750 Algarrobo-Costa, Málaga, SpainSearch for more papers by this authorJ.I. Hormaza, Corresponding Author J.I. Hormaza Instituto de Hortofruticultura Subtropical y Mediterránea ‘La Mayora’, Universidad de Málaga-Consejo Superior de Investigaciones Científicas (IHSM-UMA-CSIC), Estación Experimental ‘La Mayora’, 29750 Algarrobo-Costa, Málaga, SpainJ.I. Hormaza, Instituto de Hortofruticultura Subtropical y Mediterránea ‘La Mayora’, Universidad de Málaga-Consejo Superior de Investigaciones Científicas (IHSM-UMA-CSIC), Estación Experimental ‘La Mayora’, 29750 Algarrobo-Costa, Málaga, Spain.E-mail: [email protected]Search for more papers by this author First published: 29 March 2011 https://doi.org/10.1111/j.1744-7348.2011.00469.xCitations: 9Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Abstract Avocado shows protogynous dichogamy with two complementary cultivar types (A and B) that differ in their floral behaviour. Because of this peculiar flowering system, mixed plantings of cultivars of complementary flower type have been traditionally recommended to increase yield. However, the effect of planting complementary avocado cultivars on outcrossing rate and yield is a subject of controversy. In this work, we have studied the outcrossing rate with microsatellite markers under the growing conditions of Southern Spain. Outcrossing rate was determined at harvest on several ‘Hass’ trees situated in rows at different distances from a ‘Fuerte’ orchard for two consecutive years (2005 and 2006). Outcrossing rate ranged from 0.31 to 0.74 with an average of 0.47 showing a significant decrease from the first row (in proximity to the pollen source) to the rest of the rows. However, using data of 13 years no significant differences in yield have been recorded with increasing distance to the pollen donor trees. The paternity of abscised fruits was recorded weekly from June to the period of commercial harvest in March the following year. The results obtained indicate that the fruits that dropped during June were mostly derived from self-fertilisation. However, a high proportion of those fruits were derived from flowers fertilised during the last weeks of the ‘Hass’ blooming season when the cultivar Fuerte presents either few or no flowers. Consequently, most of the late fertilised ‘Hass’ fruits were derived from self-pollination and those small fruits compete for limited maternal resources with the earlier fertilised fruits derived from cross-pollination. These results suggest that, under our growing conditions, fruit drop in avocado is rather determined by the fertilisation date and not by the embryo genetic composition. References Alcaraz M.L., Hormaza J.I. (2008) Molecular characterization and genetic diversity in an avocado collection of cultivars and local Spanish genotypes using SSRs. 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