Occurrence and Fate of the Phytotoxin Juglone in Alley Soils under Black Walnut Trees

Kiparski, Guntram R. von; Lee, Linda; Gillespie, Andrew R.

doi:10.2134/jeq2006.0231

Cited by 47 publications

(42 citation statements)

References 59 publications

(67 reference statements)

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“…Other compounds such as juglone or phenolic acids can accumulate in soil through a mechanism of reversible sorption (Cecchi et al 2004;von Kiparski et al 2007). The triple application of parthenin at 400 µg/g soil, however, provided no indication that parthenin accumulates in soils.…”

Section: Discussionmentioning

confidence: 99%

Soil Degradation of Parthenin—Does it Contradict the Role of Allelopathy in the Invasive Weed Parthenium hysterophorus L.?

et al. 2009

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The invasive success of Parthenium hysterophorus L. is thought to be partially attributable to allelopathy mediated by the plant metabolite parthenin. To assess the ecological significance of parthenin release from plant material, its persistence and phytotoxicity in soil was studied. Results show parthenin is rapidly degraded with an average DT (50) of 59 h under standard experimental conditions. Degradation was delayed in sterilized soils, at lower soil moisture, and higher parthenin concentrations. Higher temperatures, higher CEC(pot)/clay content of soils, soil preconditioning with parthenin, and P. hysterophorus infestation accelerated degradation. Physico-chemical and biological processes are, therefore, expected to govern the fate of parthenin in soil. Parthenin exhibited low soil phytotoxicity and did not accumulate over time. Along with the indicated reduction in bioavailability and development of hormetic effects, results suggest that for parthenin to have detrimental allelopathic effects, it requires high P. hysterophorus densities that result in high soil levels of parthenin and soil conditions that favor the persistence of parthenin. In light of this, the ecological significance of parthenin is discussed.

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Section: Discussionmentioning

confidence: 99%

Soil Degradation of Parthenin—Does it Contradict the Role of Allelopathy in the Invasive Weed Parthenium hysterophorus L.?

et al. 2009

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“…Juglone is a naturally occurring electrophile and redox-cycling compound produced by black walnut trees and other members of the Juglandacea family. It is exuded into the soil by roots or decomposing leaves and fruit, where it can be encountered by C. elegans at concentrations as high as 6.4 μmol l −1 (von Kiparski et al, 2007). Paraquat is a synthetic, contact herbicide used throughout the world in agricultural applications (Powles and Yu, 2010).…”

Section: Introductionmentioning

confidence: 99%

Inhibition of the oxidative stress response by heat stress inCaenorhabditis elegans

Crombie

Tang

Choe

et al. 2016

Journal of Experimental Biology

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It has long been recognized that simultaneous exposure to heat stress and oxidative stress shows a synergistic interaction that reduces organismal fitness, but relatively little is known about the mechanisms underlying this interaction. We investigated the role of molecular stress responses in driving this synergistic interaction using the nematode Caenorhabditis elegans. To induce oxidative stress, we used the pro-oxidant compounds acrylamide, paraquat and juglone. As expected, we found that heat stress and oxidative stress interact synergistically to reduce survival. Compared with exposure to each stressor alone, during simultaneous sublethal exposure to heat stress and oxidative stress the normal induction of key oxidative-stress response (OxSR) genes was generally inhibited, whereas the induction of key heat-shock response (HSR) genes was not. Genetically activating the SKN-1-dependent OxSR increased a marker for protein aggregation and decreased whole-worm survival during heat stress alone, with the latter being independent of HSF-1. In contrast, compared with wild-type worms, inactivating the HSR by HSF-1 knockdown, which would be expected to decrease basal heat shock protein expression, increased survival during oxidative stress alone. Taken together, these data suggest that, in C. elegans, the HSR and OxSR cannot be simultaneously activated to the same extent that each can be activated during a single stressor exposure. We conclude that the observed synergistic reduction in survival during combined exposure to heat stress and oxidative stress is due, at least in part, to inhibition of the OxSR during activation of the HSR.

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“…As regards the occurrence and fate of phytotoxin juglone in alley soils under black walnut trees, showed that juglone accumulation in low fertility soils is plausible, and may still be worthy of consideration in management of alley agroforestry systems (Kiparski et al, 2007). Juglone is occasionally used as herbicide.…”

Section: Introductionmentioning

confidence: 99%

Juglone Content in Leaf and Green Husk of Five Walnut (Juglans regia L.) Cultivars

Cosmulescu

Trandafir

Achim

et al. 2011

Not Bot Hort Agrobot Cluj

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Juglone (5-hydroxy-1,4-napthoquinone) is a chemical compound released by walnut trees that can be toxic for surrounding plant species. In the present study, juglone was identified in leaves and green husk in five walnut cultivars: 'Germisara' , 'Jupanesti' , 'Franquette' , 'Vina' , 'Valcor' by using high performance liquid chromatography (HPLC-RP). Juglone was found predominant in green husk (average value of cultivars is about 31.308 mg/100 g). Significant differences in contents of identified juglone were observed among cultivars that ranged from 20.56 to 42.78 mg/100g for green husk, and 5.42 to 22.82 mg/100 g for leaves. It was also found that walnut green husk and leaves represent the most important source of walnut phenolics.

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Occurrence and Fate of the Phytotoxin Juglone in Alley Soils under Black Walnut Trees

Cited by 47 publications

References 59 publications

Soil Degradation of Parthenin—Does it Contradict the Role of Allelopathy in the Invasive Weed Parthenium hysterophorus L.?

Soil Degradation of Parthenin—Does it Contradict the Role of Allelopathy in the Invasive Weed Parthenium hysterophorus L.?

Inhibition of the oxidative stress response by heat stress inCaenorhabditis elegans

Juglone Content in Leaf and Green Husk of Five Walnut (Juglans regia L.) Cultivars

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