Influence of sterol-inhibiting fungicides on the free sterol and free fatty acid composition of Red Delicious and Jonathan apple cultivars

Overton, S. V.; Moore, Laurence J.; Orcutt, D. M.; Yoder, Keith S.; Meredith, S. A.

doi:10.1080/14620316.1988.11515846

Cited by 2 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Occasionally, mitochondria were washed out (Fig. 7), while nuclei were less moreover, an increase in the size and number of starch granules 12, 24, and 72 hr follow- (Overton et al, 1988). This correlated well ing treatment with the fungicide (Figs.…”

supporting

confidence: 57%

Fine Structure of Apple Leaves Treated with the Sterol-inhibiting Fungicide Bitertanol

Overton¹,

Moore²,

Miller³

1991

HortSci

View full text Add to dashboard Cite

Ultrastructural observations were made of leaves of apple (Malus domestics Borkh. cv. Red Delicious) 12, 24, and 72 hours following a single foliar application of the sterol-inhibiting fungicide bitertanol. Thylakoids of chloroplasts from treated leaves were swollen and irregular and chloroplasts had lost their integrity within 12 hours after treatment. Occasionally, mitochondria looked washed out, although no other changes in membrane or organelle structures were observed. Within 24 to 72 hours, moreover, thylakoids of chloroplasts from treated leaves returned to a state similar to that of the controls. However, the numbers of starch granules in the chloroplasts of treated leaves appeared to increase throughout the 72 hours and remained somewhat higher than levels in controls. Thus, bitertanol does not appear to have a lasting effect on apple leaves. Chemical name used: ß-([1,1′-biplenyl]-4-yloxy)-α-(1,1-dimethylethyl)-1H-1,2,4-trizole-1-ethanol (bitertanol).

show abstract

supporting

confidence: 57%

Fine Structure of Apple Leaves Treated with the Sterol-inhibiting Fungicide Bitertanol

Overton¹,

Moore²,

Miller³

1991

HortSci

View full text Add to dashboard Cite

show abstract

“…Lipids were extracted and the composition of FS and SEs were determined on samples harvested from both the growth studies. Lipids were extracted then separated by thin‐layer chromatography by the methods of Overton et al [24].…”

Section: Methodsmentioning

confidence: 99%

“…After cooling and acidifying with 0.05 ml of 6 N HCl in 40% methanol, the sterol was partitioned into three volumes of hexane. The sample was then dried with N 2 , re‐dissolved in hexane, and applied to another thin‐layer chromatography plate, as previously described [24], to further separate and purify the sterol. Demethyl and dimethyl sterols from the thin‐layer chromatography plates were transferred to 1‐ml reaction vials and derivatized with bistrimethyl acetamide as previously outlined.…”

Section: Methodsmentioning

confidence: 99%

Inherent and growth stage‐related differences in growth and lipid and sterol composition of algal species sensitive and tolerant to sterol‐inhibiting fungicides

Tuckey

Orcutt

Hipkins

2002

Enviro Toxic and Chemistry

View full text Add to dashboard Cite

Fourteen algal species representing five algal classes were evaluated as to the effects of four sterol-inhibiting fungicides (SIFs) on growth. Sensitivity to SIFs was related to species, chemical, and concentration. Species of Chlorella sensitive and tolerant to SIFs were further compared relative to inherent and growth stage-related differences in lipid, free sterol (FS), and steryl ester (SE) composition. Inherent and growth stage-related qualitative and quantitative differences in FS and SE composition were apparent between the two species examined. The qualitative FS and SE composition was particularly different. The importance of lipids, FS, and SE in membrane structure and control of membrane function is well established. Species differences and environmentally (growth stage, light, temperature, and nutrition) induced changes in lipid composition may be part of the basis for sensitive and tolerant responses to SIFs and xenobiotics in general. The ability of lipophilic xenobiotics to partition into membranes most likely depends on the qualitative and quantitative composition of membrane components, at any given time, and seems to be highly dynamic. Although the biochemical mechanism of action of SIFs is well established, the ability for passive bioaccumulation of such compounds in algae may be equally as important.

show abstract

Influence of sterol-inhibiting fungicides on the free sterol and free fatty acid composition of Red Delicious and Jonathan apple cultivars

Cited by 2 publications

References 0 publications

Fine Structure of Apple Leaves Treated with the Sterol-inhibiting Fungicide Bitertanol

Fine Structure of Apple Leaves Treated with the Sterol-inhibiting Fungicide Bitertanol

Inherent and growth stage‐related differences in growth and lipid and sterol composition of algal species sensitive and tolerant to sterol‐inhibiting fungicides

Contact Info

Product

Resources

About