Composition of Volatiles in Allium as Related to Habitat, Stage of Growth, and Plant Part

Saghir, A. R.; Mann, Louis K.; Yamaguchi, Mas

doi:10.1104/pp.40.4.681

Cited by 19 publications

(7 citation statements)

References 9 publications

(6 reference statements)

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“…Onion pungency is known to differ with cultivar, stage of maturity, type of soil, soil moisture, and other growing conditions (Kalra et al, 1995;Saghir et al, 1965). In our study, no significant effect of PD and irrigation rates was recorded on pungency.…”

Section: Discussioncontrasting

confidence: 54%

Crop Coefficient-based Deficit Irrigation and Planting Density for Onion: Growth, Yield, and Bulb Quality

Leskovar¹,

Agehara²,

Yoo³

et al. 2012

horts

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Additional index words. Allium Cepa, evapotranspiration, bulb size, pungency, flavonoids, quercetin Abstract. Agricultural communities in the semiarid regions of the world are constantly being affected by water scarcity, increased regulations restricting water use, strong competition for irrigation water with the urban sector, and severe drought periods. Conversely, the consumer demand for high-quality and nutritious foods is increasing rapidly. A 2-year field study evaluated growth, yield, and bulb quality in response to precision planting density and deficit irrigation of onion (Allium cepa L.) in southwest Texas. Seeds of short-day sweet onion cv. Texas Grano 1015Y were planted in the field on 11 Nov. 2007 and 30 Oct. 2008 at two planting densities (PDs), 397,000 (standard) and 484,000 (high) seeds/ha. Three irrigation rates using growth stage-specific crop coefficients and subsurface drip were imposed after plants were fully established, 100%, 75%, and 50% crop evapotranspiration rates (ETc). Total rainfall plus irrigation received for each irrigation rate were 594, 501, and 413 mm in 2008 and 662, 574, and 486 mm in 2009. In both seasons, there were consistent trends in growth, yield, and quality parameters. Leaf fresh weight was unaffected by PD but was reduced by deficit irrigation at 50% ETc. Although increasing planting density reduced the average bulb size by 12%, it increased the number of marketable bulbs by 21% to 33% and marketable yield by 7% to 14%. In contrast, deficit irrigation showed a trend to reduce both the number of bulbs and bulb size with yield reductions of 8% to 13% at 75% ETc and 19% to 27% at 50% ETc. Neither planting density nor deficit irrigation rate had a significant effect on soluble solids content, pungency, or quercetin contents. These results suggest that growers of short-day onions in semiarid regions could adjust PDs to target high-value bulb sizes. Implementing water-conserving practices (deficit irrigation at 75% ETc rate) would result in a decrease of high-value bulb grades and modest losses in yield but not flavor or nutritional components.

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Section: Discussioncontrasting

confidence: 54%

Crop Coefficient-based Deficit Irrigation and Planting Density for Onion: Growth, Yield, and Bulb Quality

Leskovar¹,

Agehara²,

Yoo³

et al. 2012

horts

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“…Lee et al (2009) FW) contents were very pungent. Furthermore, the amounts of organosulfur compounds are affected by the variety, maturity, soil fertility, and other growing conditions (Saghir et al, 1965). In this study, long-day bulb onions, cultivated from March to September and grown during the summer, showed a higher PeCSO content than short-day bulb onions cultivated from September to March.…”

Section: Discussionmentioning

confidence: 66%

Comparative Study on Phytochemical Variations in Japanese F<sub>1</sub> Varieties of Bulb Onions and South-East Asian Shallot Landraces

et al. 2018

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Wide-ranging varieties and/or strains of bulb onions (Allium cepa Common onion group) and shallots (A. cepa Aggregatum group) were utilized to understand the variation in chemical compounds responsible for their taste. The bulb samples of 10 F 1 commercial onion varieties (seven short-day and three long-day varieties) from Japan and 12 shallot landraces from abroad (Vietnam: three landraces; Indonesia: nine landraces) were collected as plant materials once a year in 2014 and 2015. The contents of S-alk(en)yl-L-cysteine sulfoxides, total flavonoids, and soluble sugars-including fructose, glucose, sucrose, and fructans-were determined to find differences between bulb onions and shallots, as well as to detect variations among varieties and/or landraces. While a principal component analysis (PCA) based on the results from both 2014 and 2015 could clearly discriminate shallots from bulb onions from a phytochemical perspective, bulb onions mainly had higher monosaccharides than shallots. By contrast, shallots produced more disaccharides than bulb onions. In most cases, regression analyses using the numerical data of the chemical compounds found in bulb onions and shallots suggested year-year correlations between 2014 and 2015. The flavonoid and PeCSO (S-(1-propenyl)-Lcysteine sulfoxide: isoalliin) contents in shallots were higher than those detected in bulb onions, which indicated the stronger pungent and bitter taste could be attributable to excess amounts of these compounds in this tropical plant.

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“…Since the sections used by all these authors are distinguished by only a small number of characters it was thought worthwhile to study a sample of rhizomatous taxa for a relatively large number of morphological and cytological characters and to compare classifications produced from these data with others derived from a set of chemical characters. Volatile sulphides produced after tissue damage have been investigated, since it has been shown (Saghir, Mann and Yamaguchi, 1965;Saghir, Mann, Ownbey and Berg, 1966;Bernhard, 1970;Freeman and Whenham, 1975) that there is substantial variation between taxa of Allium in the composition of the sulphides produced and that these are readily separable by gas-liquid ehromatography.…”

Section: Introductionmentioning

confidence: 99%

“…Volatile sulphides produced after tissue damage have been investigated, since it has been shown (Saghir, Mann and Yamaguchi, 1965;Saghir, Mann, Ownbey and Berg, 1966;Bernhard, 1970;Freeman and Whenham, 1975) that there is substantial variation between taxa of Allium in the composition of the sulphides produced and that these are readily separable by gas-liquid ehromatography.…”

Section: In ] 84mentioning

confidence: 99%

NUMERICAL TAXONOMIC STUDIES ON SPECIES IN ALLIUM SUBGENUS RHIZIRIDEUM

El-Gadi

Elkington

1977

New Phytologist

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SUMMARYNumerical taxonomic studies have been carried out on fifteen operational taxonomic units (O.T.U.'s) belonging to Allium suhgenus Rhizirideum. The data comprise measurements and observations of forty-nine morphological and cytological characters and thirty-eight chemical characters which are volatiles detected by gas liquid ehromatography of direct vapour samples and mainly identified as sulphides. The CLASP program has been used to analyse the data. Classifications derived from hierarchical cluster analyses and principal co-ordinates analyses are presented as dendrograms and vector plots respectively, the latter with the minimum spanning trees added. Classifications produced by analysis of the morphological and cytological characters and chemical characters are compared both with one another and with those produced by analysis of all characters.

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Composition of Volatiles in Allium as Related to Habitat, Stage of Growth, and Plant Part

Cited by 19 publications

References 9 publications

Crop Coefficient-based Deficit Irrigation and Planting Density for Onion: Growth, Yield, and Bulb Quality

Crop Coefficient-based Deficit Irrigation and Planting Density for Onion: Growth, Yield, and Bulb Quality

Comparative Study on Phytochemical Variations in Japanese F<sub>1</sub> Varieties of Bulb Onions and South-East Asian Shallot Landraces

NUMERICAL TAXONOMIC STUDIES ON SPECIES IN ALLIUM SUBGENUS RHIZIRIDEUM

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