Evaluation of growth regulator inhibitors for controlling postbloom fruit drop (PFD) of citrus induced by the fungus Colletotrichum acutatum
Identifieur interne : 002660 ( Main/Exploration ); précédent : 002659; suivant : 002661Evaluation of growth regulator inhibitors for controlling postbloom fruit drop (PFD) of citrus induced by the fungus Colletotrichum acutatum
Auteurs : Hui-Qin Chen [États-Unis] ; Katherine L. Dekkers [États-Unis] ; LIHUA CAO [République populaire de Chine] ; Jacqueline K. Burns [États-Unis] ; L. W. Timmer [États-Unis] ; Kuang-Ren Chung [États-Unis]Source :
- HortScience [ 0018-5345 ] ; 2006.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Fruit, Horticulture.
English descriptors
- KwdEn :
Abstract
Postbloom fruit drop (PFD) of citrus is incited by the fungus Colletotrichum acutatum J. H. Simmonds and may result in young fruit drop and severe yield losses. Previous studies suggested that imbalance of growth regulators such as auxin, ethylene, and jasmonic acid (JA) plays an essential role in young fruit abscission. In this work, we determined the factors associated with fungal-induced fruit drop by testing compounds inhibitory to hormonal transport or biosynthesis. As assessed on sweet orange (Citrus sinensis Osbeck) and grapefruit (C. paradisi Macf.) for 4 years, we found that many auxin transport and action inhibitors such as 2,3,5-triiodobenzolic acid (TIBA), 2-(4-chlorophenoxy)-2-methyl-propionic acid (clofibrate), or quercetin and JA biosynthesis inhibitors such as salicylic acid (SA) and aspirin (methyl-SA) applied 7 d after C. acutatum infection resulted in higher percentages of young fruit retention compared with the water controls. The commercial products ReZist and Actigard, widely used as systemic acquired resistance (SAR) agents, also improved fruit retention. Furthermore, application of gibberellic acid (GA3) on sweet orange, regardless of C. acutatum infection, significantly increased fruit retention. These commercial products may be very useful in managing this destructive disease of citrus in the field.
Affiliations:
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H. Simmonds and may result in young fruit drop and severe yield losses. Previous studies suggested that imbalance of growth regulators such as auxin, ethylene, and jasmonic acid (JA) plays an essential role in young fruit abscission. In this work, we determined the factors associated with fungal-induced fruit drop by testing compounds inhibitory to hormonal transport or biosynthesis. As assessed on sweet orange (Citrus sinensis Osbeck) and grapefruit (C. paradisi Macf.) for 4 years, we found that many auxin transport and action inhibitors such as 2,3,5-triiodobenzolic acid (TIBA), 2-(4-chlorophenoxy)-2-methyl-propionic acid (clofibrate), or quercetin and JA biosynthesis inhibitors such as salicylic acid (SA) and aspirin (methyl-SA) applied 7 d after C. acutatum infection resulted in higher percentages of young fruit retention compared with the water controls. The commercial products ReZist and Actigard, widely used as systemic acquired resistance (SAR) agents, also improved fruit retention. Furthermore, application of gibberellic acid (GA<sub>3</sub>) on sweet orange, regardless of C. acutatum infection, significantly increased fruit retention. These commercial products may be very useful in managing this destructive disease of citrus in the field.</div></front></TEI><affiliations><list><country><li>République populaire de Chine</li><li>États-Unis</li></country><region><li>Floride</li></region></list><tree><country name="États-Unis"><region name="Floride"><name sortKey="Chen, Hui Qin" sort="Chen, Hui Qin" uniqKey="Chen H" first="Hui-Qin" last="Chen">Hui-Qin Chen</name></region><name sortKey="Burns, Jacqueline K" sort="Burns, Jacqueline K" uniqKey="Burns J" first="Jacqueline K." last="Burns">Jacqueline K. Burns</name><name sortKey="Chung, Kuang Ren" sort="Chung, Kuang Ren" uniqKey="Chung K" first="Kuang-Ren" last="Chung">Kuang-Ren Chung</name><name sortKey="Dekkers, Katherine L" sort="Dekkers, Katherine L" uniqKey="Dekkers K" first="Katherine L." last="Dekkers">Katherine L. Dekkers</name><name sortKey="Timmer, L W" sort="Timmer, L W" uniqKey="Timmer L" first="L. W." last="Timmer">L. W. Timmer</name></country><country name="République populaire de Chine"><noRegion><name sortKey="Lihua Cao" sort="Lihua Cao" uniqKey="Lihua Cao" last="Lihua Cao">LIHUA CAO</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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