Repeating cycles of ON and OFF yields in alternate bearing olive, pistachio and citrus trees – different mechanisms, common solutions

Fichtner, E.; Chao, Yi-Yun; Ferguson, Louise; Verreynne, J.S.; Tang, Lisa; Lovatt, Carol J.

doi:10.17660/actahortic.2021.1315.1

Cited by 2 publications

(1 citation statement)

References 9 publications

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“…Girdling, which induces sugar content in the canopy, might well mitigate previous fruit effects on flowering, and pruning is also a common practice. In line with the notion that auxin canalization is the origin of dominance, use of inhibitors of polar auxin transport, such as tri-iodobenzoic acid, has also been shown to mitigate fruit–flower feedback inhibition ( Fichtner et al , 2021 ). However, deeper understanding of the underlying molecular mechanisms will hopefully in the future allow more stable, genetic manipulation of fruit-tree germplasm, in order to overcome the self-limiting effects controlling fruit–flower feedback without labour-intensive practices.…”

Section: Perspectivesmentioning

confidence: 92%

Just enough fruit: understanding feedback mechanisms during sexual reproductive development

Sadka

Walker

Haim

et al. 2023

Journal of Experimental Botany

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The fruit and seed produced by a small number of crop plants provide the majority of food eaten across the world. Given the growing global population, there is a pressing need to increase yields of these crops without using more land or more chemical inputs. Many of these crops display prominent ‘fruit-flowering feedbacks’, in which fruit produced early in sexual reproductive development can inhibit the production of further fruit by a range of mechanisms. Understanding and over-coming these feedbacks thus presents a plausible route to increasing crop yields ‘for free’. In this review, we define three key types of fruit-flowering feedback, and examine how frequent they are, and their effects on reproduction in a wide range of both wild and cultivated species. We then assess how these phenomenologically distinct phenomena might arise from conserved phytohormonal signalling events, particularly the export of auxin from growing organs. Finally, we offer some thoughts on the evolutionary basis for these self-limiting sexual reproductive patterns, and whether they are also present in the cereal crops that fundamentally underpin global diets.

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Section: Perspectivesmentioning

confidence: 92%

Just enough fruit: understanding feedback mechanisms during sexual reproductive development

Sadka

Walker

Haim

et al. 2023

Journal of Experimental Botany

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Can Olive Pruning Forms Influence the Olive Rhizosphere? The Root Microbiota and the Rhizosphere Properties in the Alto Ricaurte (Colombia)

et al. 2022

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(1) Background: Olive in Colombia is not a traditional crop, but in the Andean Region, ancient olive trees are widespread. The area is characterized by a climate condition with a high intensity of UV rays and meteoric events that negatively affect the olive grown. In this work, changes in the soil of olive trees subjected to different pruning will be established. (2) Methods: Olive trees of 2-years-old were cultivated in Boyacá (Colombia). Trees were pruned into a vase shape, globe shape, and natural shape. Physical, chemical, and biological soil analyses were carried out. (3) Results: In the olive tree, V and G pruning significantly increase the P content in the soil compared to NS, and these pruning forms reduce the OOC significantly in the rhizosphere soil by 87.5% and 78.3%, respectively. In all conditions, the roots established an association with Arbuscular Mycorhizal Fungi and stimulated the presence of other microorganisms, despite the trees being more vegetative than productive in this latitude. (4) Conclusions: The results of the study indicate that, in Colombian conditions, the pruning does not affect the rhizospheric soil conditions.

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Repeating cycles of ON and OFF yields in alternate bearing olive, pistachio and citrus trees – different mechanisms, common solutions

Cited by 2 publications

References 9 publications

Just enough fruit: understanding feedback mechanisms during sexual reproductive development

Just enough fruit: understanding feedback mechanisms during sexual reproductive development

Can Olive Pruning Forms Influence the Olive Rhizosphere? The Root Microbiota and the Rhizosphere Properties in the Alto Ricaurte (Colombia)

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