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Anish Malladi, Tripti Vashisth, and Lisa Klima Johnson

mg·L −1 was reported to have resulted in ≈33% fruit abscission by 7 d after treatment in ‘Tifblue’ ( Ban et al., 2007 ). Jasmonates are a group of compounds that include MeJa and its precursor, jasmonic acid, and are derived from the oxylipin pathway

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Tripti Vashisth and Anish Malladi

herbivore attack (Taylor and Whitelaw, 2001). Multiple phytohormones such as auxins, ethylene, jasmonates, and abscisic acid regulate the signaling mechanisms leading to the activation and progression of abscission ( Hartmond et al., 2000 ; Kim et al., 2013

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Xuetong Fan and James P. Mattheis

Airborne methyl jasmonate (MJ) can modulate apple fruit ripening, including the degreening process. Degreening of `Fuji' and `Golden Delicious' apples by jasmonates [jasmonic acid (JA) and MJ] in aqueous solution was investigated. JA and MJ applied by dipping apples in solutions of jasmonates for 2 min enhanced degreening during ripening at 20C. MJ was more effective at promoting degreening compared to JA. The minimum concentration of jasmonates required to promote significant degreening during the 2-week ripening period was 1 mM. Degreening of jasmonate-treated apples ripened at 4C progressed slower compared to apples ripened at 20°C. JA stimulated apple fruit ethylene production at concentrations as low as 10 μM. Jasmonates at 1 or 10 mM were more effective at accelerating the degreening process compared to 0.35 or 3.5 mM ethephon. Firmness, soluble solids content, and titratable acidity of `Fuji' apples were not significantly affected by jasmonate treatments. Peel injury occurred on apples treated with 10 mM JA or 3.5 mM ethephon.

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Xinhua Zhang, Fujun Li, Nana Ji, Shujun Shao, Dongyang Wang, Ling Li, and Fansheng Cheng

, the chambers were opened, and three lots of fruit were stored at 2 ± 1 °C with a relative humidity of 80% to 90% for up to 28 d. Fig. 1. Schematic diagram for tomato fruit treatment with methyl jasmonate (MeJA). Ten fruit were placed in a 9-L airtight

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Ahmet Korkmaz

1 E-mail . I would like to thank Iskender Tiryaki for kindly supplying methyl jasmonate.

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Hyoung Seok Kim and John A. Juvik

only two broccoli genotypes ( Robbins et al., 2005 ). We have investigated changes in Se and GS concentrations in five different broccoli cultivars after Se fertilization, MeJA treatments, or a combination of these treatments. Methyl jasmonate, a

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Ulrich Hartmond, Rongcai Yuan, Jacqueline K. Burns, Angela Grant, and Walter J. Kender

Methyl jasmonate (MJ) was tested as a potential abscission chemical to enhance mechanical harvest of `Hamlin' and `Valenica' orange [Citrus sinensis (L.) Osb.]. In field experiments, a solution of 1, 5, 10, 20, or 100 mm MJ was applied either as a stem wrap to individual fruit or as a spray to entire trees or canopy sectors. Solutions of 10, 20, and 100 mm MJ resulted in significant and consistent reduction of fruit detachment force and caused fruit drop within 7 to 10 days. Fruit loosening was preceded by an increase in the internal ethylene concentration of fruit similar to that of other experimental abscission compounds. While concentrations of 10 mm and less caused no or negligible phytotoxicity, solutions exceeding 10 mm MJ induced unacceptable levels of leaf abscission.

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Xuetong Fan, James P. Mattheis, and John K. Fellman

The effect of exogenous methyl jasmonate (MJ) and jasmonic acid (JA) compared with the effect of ethephon on surface color and quality of `Golden Delicious' and `Fuji' apples (Malus ×domestica Borkh.) was studied. Treatments were applied by dipping fruit in water solutions of JA, MJ, or ethephon or by exposing fruit to MJ vapors. Response to MJ vapor treatment depended on fruit developmental stage, with the maximum effect occurring as fruit began to produce ethylene. MJ promoted color changes more effectively than JA. The promotive effect of JA increased with JA concentration. A minimum concentration of 0.1 mmol·L-1 JA was needed to promote significant color change within 15 d at 20 °C. JA at 1 or 10 mmol·L-1 promoted color change more effectively than 0.35 or 3.5 mmol·L-1 ethephon. The magnitude of JA-promoted responses decreased at lower temperatures. Treatments with 10 mmol·L-1 JA or 3.5 mmol·L-1 ethephon were phytotoxic. Treatments using JA at 1 or 10 mmol·L-1 in water promoted loss of fruit titratable acidity compared to controls. Firmness and soluble solids content were relatively unresponsive to JA treatments. Based on these results, using JA and MJ to promote degreening of apple fruit with minimal loss of other quality attributes appears feasible.

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Raquel González-Herranz, Kimberley A. Cathline, Matthew W. Fidelibus, and Jacqueline K. Burns

jasmonate (MeJA) to grapes can reduce FDF to a similar extent as cane severance and thus might offer an alternative to cane severance ( Fidelibus et al., 2007a ). The purpose of this study was to verify the concentration of MeJA needed for consistent

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Kang Mo Ku and John A. Juvik

., 2010 ). Endogenous jasmonic acid has been observed to accumulate in planta under drought conditions ( Creelman and Mullet, 1995 ). Thus, conditions in 2011 may have led to the accumulation of endogenous jasmonate, which could have attenuated the