Resource investments in reproductive growth proportionately limit investments in whole-tree vegetative growth in young olive trees with varying crop loads

Tree Physiology
Adolfo RosatiFranco Famiani

Abstract

It has long been debated whether tree growth is source limited, or whether photosynthesis is adjusted to the actual sink demand, directly regulated by internal and environmental factors. Many studies support both possibilities, but no studies have provided quantitative data at the whole-tree level, across different cultivars and fruit load treatments. This study investigated the effect of different levels of reproductive growth on whole-tree biomass growth across two olive cultivars with different growth rates (i.e., Arbequina, slow-growing and Frantoio, fast-growing), over 2 years. Young trees of both cultivars were completely deflowered either in 2014, 2015, both years or never, providing a range of levels of cumulated reproductive growth over the 2 years. Total vegetative dry matter growth over the 2 years was assessed by destructive sampling (whole tree). Vegetative growth increased significantly less in fruiting trees, however, the total of vegetative and reproductive growth did not differ significantly for any treatment or cultivar. Vegetative growth over the 2 years was closely (R2 = 0.89) and inversely related to reproductive growth across all treatments and cultivars. When using data from 2015 only, the regression impr...Continue Reading

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Citations

Oct 5, 2018·Tree Physiology·Michael G RyanRichard H Waring
Oct 22, 2019·Frontiers in Plant Science·Andrea MiserereMaria Cecilia Rousseaux
Mar 11, 2020·Frontiers in Plant Science·Monica Marilena MiazziFrancesco Bozzo
Dec 8, 2020·Frontiers in Plant Science·Rachele FalchiGiannina Vizzotto

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