Table 1.
Problem scheme according to variety behavior.
Table 2.
Electronic search strategy.
Fig 1.
Overview of the article selection process.
Papers were collected considering the search string in the databases.
Fig 2.
Classification of the 612 records in 11 groups according to the crop cycle process that GA affected.
Table 3.
Summary of the initial data extraction per process.
Effect of GA on other Citrus development processes. Flowering, Fruit set and yield, and pest and disease groups are not included.
Fig 3.
Number of publications per year, from 1959 to 2017.
Fig 4.
Number of publications per country (A) and per species (B).
Fig 5.
Number of publications per application time (A), assay type (B), observation scale (C) and tree age (D). Note: the total number of publications does not necessarily have to be 58 as in some cases, e.g. tree age was not specified, and several observation scales were used in other cases.
Fig 6.
Number of publications per experimentation years for the 58 publications from 1959 to 2017 with indications of it.
Fig 7.
The GA concentrations used in the reviewed studies.
For each concentration, the number of publications which used that concentration was noted. Percentages were calculated over the total amount of annotations.
Fig 8.
Alluvial diagram for the pre-flowering treatment results.
Only the pre-flowering treatment studies were considered. The effect of GA pre-flowering treatments on flowering, fruit set and yield for each reviewed publication was noted as follows: N, no effect; I, increase; D, decrease; O, not studied and V, variable result. Bandwidth reflects the number of publications. The narrowest bandwidth represents a single publication. Red denotes the articles in which GA decreased flowering, while gray denotes the articles in which GA had a different effect.
Fig 9.
Alluvial diagram for the results of treatments done at full bloom or some weeks later.
Only the studies with treatments at full bloom or some weeks later were considered. The effect of GA at full bloom on flowering, fruit set and yield for each reviewed publication was noted as follows: N, no effect; I, increase; D, decrease; O, not studied and V, variable results. Bandwidth reflects the number of publications. The narrowest bandwidth represents a single publication. Green denotes the articles in which GA increased fruit set, while gray denotes the articles in which GA had a different effect.