NDLI: Naphthalene Acetic Acid and 2,3,5-triiodobenzoic Acid Affect the Response of Mature Orange Fruit to Abscission Chemicals

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Naphthalene Acetic Acid and 2,3,5-triiodobenzoic Acid Affect the Response of Mature Orange Fruit to Abscission Chemicals

Content Provider	Semantic Scholar
Author	Yuan, Rongcai Hartmond, Ulrich Kender, Walter J.
Copyright Year	2002
Abstract	Effects of NAA, TIBA, ethephon, and CMN-Pyrazole on fruit detachment force (FDF) of mature 'Valencia' and 'Hamlin' orange (Citrus sinensis (L.) Osb.) fruit were examined in 2000 and 2001. NAA effectively inhibited the reduction in FDF or fruit abscission caused by ethephon when applied to the abscission zone 24 hours before ethephon application, but had no significant effect when applied to the fruit without contacting the abscission zone, or to the peduncle ≈4 cm above the abscission zone. TIBA, an auxin transport inhibitor, decreased FDF of mature fruit and promoted fruit abscission when applied alone as a spray to the canopy or directly to the fruit peduncle. This response was dependent on TIBA concentration. TIBA was more effective when applied in combination with ethephon or CMN-Pyrazole than alone. These results are consistent with our previous data that endogenous auxin concentration in the abscission zone of mature 'Valencia' orange fruit is one of the factors controlling the sensitivity and thus the responsiveness of the abscission zone of mature fruit to abscission chemicals. Chemical names used: 5-chloro-3-methyl-4-nitro-pyrazole (CMN-Pyrazole); 2-chloroethylphos- phonic acid (ethephon); naphthalene acetic acid (NAA); 2,3,5-triiodobenzoic acid (TIBA).
Starting Page	348
Ending Page	352
Page Count	5
File Format	PDF HTM / HTML
DOI	10.21273/hortsci.37.2.348
Volume Number	37
Alternate Webpage(s)	https://journals.ashs.org/hortsci/view/journals/hortsci/37/2/article-p348.pdf
Alternate Webpage(s)	https://doi.org/10.21273/hortsci.37.2.348
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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