Abstract
Multiannual fruit bearing in fruit trees varies from regular bearing, with an almost steady yield from season to season, to alternate bearing, during which a year with a high fruit load (on-crop) is followed by a year of a low fruit load (off-crop). ‘Orri’ mandarin [Temple (Citrus temple hort. ex Y. Tanaka) × Dancy ( Citrus tangerine hort. ex Tanaka)] exhibits a nonregular bearing pattern: steady for a few years and alternate for others. In nonregular or alternate-bearing cultivars, fruit load is thought to regulate flowering induction and development negatively the following year. In citrus, the bud meristem develops into a leafless inflorescence (generative), leafy inflorescence (mixed type, containing leaves and flowers in various ratios), or vegetative shoot, or remains dormant. Mixed-type inflorescences contribute to most of the final yield. Gibberellins inhibit flowering when applied at relatively high concentrations during the flowering induction period in the winter, but they are suggested to induce yield when applied at relatively low concentrations. We determined the effect of mild gibberellin application in an off-crop year on the productivity of ‘Orri’ mandarin, and whether it occurs through the induction of mixed-type inflorescences. Low-concentration, low-frequency gibberellin treatments were applied to trees during the winter when fruit load was high, resulting in a greater number of mixed vs. generative inflorescences at anthesis. An average increase of 40% in fruit number and yield weight was recorded in off-crop seasons at harvest, whereas no change was recorded in on-crop seasons. We discuss treatment efficiency in on-crop and off-crop years as a practical tool for increasing yield in low-crop seasons of ‘Orri’ mandarin.
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Claims 3
Claim · model-written summary
Gibberellin treatment in off-crop seasons increased fruit number and yield weight of mandarin by an average of 40%.
- Taxon
- mandarint0
- Material
- Orrit0
- Treatment
- Low-concentration, low-frequency gibberellin treatmentse0
- Outcome
- fruit number and yield weighte1
- Direction
- increasee1
- Value
- 40%e1
- Qualifier
- in off-crop seasons at harveste1
Not reportedComparator
Verbatim
t0“‘Orri’ Mandarin”
e0“Low-concentration, low-frequency gibberellin treatments were applied to trees during the winter when fruit load was high”
e1“An average increase of 40% in fruit number and yield weight was recorded in off-crop seasons at harvest”
Claim · model-written summary
Gibberellin treatment caused no change in fruit number and yield weight in on-crop seasons.
- Taxon
- mandarint0
- Treatment
- Low-concentration, low-frequency gibberellin treatmentse0
- Outcome
- fruit number and yield weighte1
- Direction
- no changee2
- Qualifier
- on-crop seasonse2
Not reportedComparator
Verbatim
t0“‘Orri’ Mandarin”
e0“Low-concentration, low-frequency gibberellin treatments were applied to trees during the winter when fruit load was high”
e1“An average increase of 40% in fruit number and yield weight was recorded in off-crop seasons at harvest”
e2“whereas no change was recorded in on-crop seasons”
Claim · model-written summary
Gibberellin treatment gave a greater number of mixed-type than generative inflorescences at anthesis in mandarin.
Verbatim
t0“‘Orri’ Mandarin”
e0“Low-concentration, low-frequency gibberellin treatments were applied to trees during the winter when fruit load was high”
e3“resulting in a greater number of mixed vs. generative inflorescences at anthesis”
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class · yield · Citrus reticulata (tangerine)Results agree
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See all 7 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.