Effects of Exogenous Gibberellic Acid in Huanglongbing-affected Sweet Orange Trees under Florida Conditions—II. Fruit Production and Tree Health
نویسندگان
چکیده
Fruit production of sweet orange ( Citrus sinensis ) in Florida has been declining with the presence Huanglongbing [HLB; Candidatus Liberibacter asiaticus (CLas)] disease. Through disruption balance endogenous hormone levels, disease negative impacts on fruit development, mature retention, and overall tree health. Thus, goal this research was to determine whether plant growth regulator gibberellic acid (GA 3 can be used improve issues caused by HLB. For ‘Valencia’ orange, although foliar applied GA from September January (33 mg·L −1 for five applications) resulted 50% decrease bloom following spring (results presented Tang et al., 2021), treatment did not cause reduction yield current subsequent crops. Moreover, a 30% average increase -treated trees observed over period 4 years. The size also increased (by 4% 5%) reduced drop rate near harvest compared nontreated control trees. Furthermore, canopy density, an indicator HLB severity, maintained (from 90.8% light interception 90.4%). In contrast, there substantial density 91.6% 84.0%). Gene expression analysis abscission zone leaves indicated that had enhanced oxidative stress mitigation mechanism defense response. Given is no cure HLB, these results possible remedy using sustaining health field-grown affected
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ژورنال
عنوان ژورنال: Hortscience
سال: 2022
ISSN: ['0018-5345', '2327-9834']
DOI: https://doi.org/10.21273/hortsci16277-21