Effect of temperature and photoperiod on the incidence of bulbing and bolting in seedlings of onion cultivars of diverse origin

Khokhar, K. M.

doi:10.1080/14620316.2008.11512412

Cited by 24 publications

(19 citation statements)

References 1 publication

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“…This occurs in Central South Chile when the bulb maturation process is not yet complete in March. It is known that the time required for bulb maturity decreases linearly with increasing temperature and lengthening photoperiod (Khokhar, 2008). 'Valinia INIA' had very few thicknecked onions in the six seasons evaluated in the Bío Bío Region (Table 5).…”

Section: Variety Assaysmentioning

confidence: 99%

Valinia INIA, a New Early Storage Onion Variety for Central South Chile

Herrera

2012

Chilean J. Agric. Res.

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Section: Variety Assaysmentioning

confidence: 99%

Valinia INIA, a New Early Storage Onion Variety for Central South Chile

Herrera

2012

Chilean J. Agric. Res.

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“…'Ramata di Montoro' from early February to mid-March resulted in remarkable shortening of crop cycles, with smaller leaf area and dry weight of plants in the latest planted crops. In fact, the longer growth season of earlyplanted crops allows the plants to develop larger leaf area and higher biomass than the late-planted cultivations whose vegetative growth is accelerated by increasing photoperiod, light intensity and air temperature (Khokhar 2008). Planting time also affects the mean weight and grade of bulbs as well as marketable yield: the values of these parameters gradually decrease when the planting is delayed from mid-winter to late-winter, as a consequence of crop length reduction which shortens the time available for synthesis and storage of metabolites into the bulbs (Boyhan et al 2009a;Caruso et al 2014).…”

Section: Farming Practicesmentioning

confidence: 99%

“…This is a consequence of the increased competition among plants for the available resources and of the limited space for bulb expansion. Leskovar et al 2004;Kadayifci et al 2005;Bolandnazar et al 2007;Kumar et al 2007b;Khokhar 2008;Lee et al 2012;Buckland et al 2013;Caruso et al 2014;Sivesind et al 2012 Mean bulb weight (g) 47.0-643 Hamilton 1998; Kumar et al 2007b;Khokhar 2008;Lee et al 2012;Caruso et al 2014 Total plant dry weight (kg/m 2 ) 1.0-1. 4 Drost, Koening 2001;Caruso et al 2014 Leaf area index (m 2 /m 2 ) 3.2-5.1 Drost, Koenig 2001;Caruso et al 2014 Nutrient requirement and fertilization.…”

Section: Farming Practicesmentioning

confidence: 99%

Interactions among genotype, environment and agronomic practices on production and quality of storage onion (Allium cepa L.) - A review

Sękara¹,

Pokluda²,

Vacchio³

et al. 2017

Hortic. Sci.

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Sekara A., Pokluda R., Del Vacchio L., Somma S., Caruso G. (2017) The aim of this review is a wide description of the relationships between growing conditions and bulb yield and quality of onion (Allium cepa L.), focused particularly on long-day cultivars suitable for storage. Marketable yield decreases according to the reduction of crop length caused by the increase of growth temperature. The nutritive requirements of storage onion are highest during the vegetative growth. The application of humic substances and the inoculation of mycorrhizae may enhance bulb growth and quality, mainly under stress conditions. Onion is a slow-growth, shallowrooted crop with non-shading habitus and therefore its productivity is highly dependent on water availability in the soil, proper fertilization and weed control. The shelf-life of onion bulbs is a genetic trait, improvable by efficient crop and post-harvest management, and adequate conditions of bulb storage. The quality of storage onion bulbs is ascribed to several indicators, such as thiosulfonates, pyruvic acid, soluble solids, sugars, and many other biological compounds. This review is also focused on onion quality as affected by the interactions among genotype, environment, farming practices and post-harvest management.

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“…Relative growth rate of onion increases linearly between 6 °C and 20 °C (Brewster, 2008). Supraoptimal temperatures negatively affect yield, bulb quality, dry matter content and bulb shape of onion (Welbaum, 2015), while lower temperatures cause later foliage fall down and therefore longer duration of bulbing (Khokar, 2008). Besides affecting the growth of bulbs, temperature also affects nutritional values, flavour intensity, dry matter and sugar content of the bulb (Lee and Suh, 2009).…”

Section: Introductionmentioning

confidence: 99%

Water Supply and Temperature Effects on Some Nutritive Constituents of Direct Sown Onion

Ombódi

Lugasi

Daood

et al. 2016

Not Bot Horti Agrobo

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Irrigation is a prerequisite for economical onion production under dry conditions. However, its effect on dry matter and nutrient content often remains a concern for growers. A direct sown onion hybrid was grown under open field, rain-fed and irrigated conditions for three years, investigating the effects of air temperature and water supply on some nutritive constituents. Dry matter, storage sugar, total flavonol and total polyphenol content showed strong positive correlation with average air temperature and negative correlation with water supply. However, irrigation had a positive effect on storage sugar and dry matter content. Presumably better water supply during dry periods ensured by irrigation provided the basis for higher photosynthetic production, and hereby more dry matter partitioning and accumulation in the bulb, a storage organ. An unexpected decrease in vitamin C content was experienced in 2011 and 2012, compared to the result of 2010, which was explained by the hot and dry conditions of the pre-harvest irrigation cut-off period. Fibre and ash content was found to be the most stable nutritional characteristics, affected neither by the environmental conditions, nor by the irrigation. Irrigation has proved to be very beneficial for direct sown onion, doubling bulb yield while not affecting the nutritive quality negatively.

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Effect of temperature and photoperiod on the incidence of bulbing and bolting in seedlings of onion cultivars of diverse origin

Cited by 24 publications

References 1 publication

Valinia INIA, a New Early Storage Onion Variety for Central South Chile

Valinia INIA, a New Early Storage Onion Variety for Central South Chile

Interactions among genotype, environment and agronomic practices on production and quality of storage onion (Allium cepa L.) - A review

Water Supply and Temperature Effects on Some Nutritive Constituents of Direct Sown Onion

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