Bulbing in Onions: Photoperiod and Temperature Requirements and Prediction of Bulb Size and Maturity

Lancaster, Jane E.; Triggs, Christopher M.; Ruiter, J. M. de; Gandar, P. W.

doi:10.1006/anbo.1996.0138

Cited by 70 publications

(52 citation statements)

References 16 publications

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“…ARTICLE formation 21,[41][42][43] , the 'hormone' controlling this process has not been identified. Here we provide evidence that genes encoding FT-like proteins play a key role in controlling both onion bulb formation and flowering.…”

Section: Resultsmentioning

confidence: 99%

FLOWERING LOCUS T genes control onion bulb formation and flowering

et al. 2013

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Onion (Allium cepa L.) is a biennial crop that in temperate regions is planted in the spring and, after a juvenile stage, forms a bulb in response to the lengthening photoperiod of late spring/ summer. The bulb then overwinters and in the next season it flowers and sets seed. FLOWERING LOCUS T (FT) encodes a mobile signaling protein involved in regulating flowering, as well as other aspects of plant development. Here we show that in onions, different FT genes regulate flowering and bulb formation. Flowering is promoted by vernalization and correlates with the upregulation of AcFT2, whereas bulb formation is regulated by two antagonistic FT-like genes. AcFT1 promotes bulb formation, while AcFT4 prevents AcFT1 upregulation and inhibits bulbing in transgenic onions. Long-day photoperiods lead to the downregulation of AcFT4 and the upregulation of AcFT1, and this promotes bulbing. The observation that FT proteins can repress and promote different developmental transitions highlights the evolutionary versatility of FT.

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Section: Resultsmentioning

confidence: 99%

FLOWERING LOCUS T genes control onion bulb formation and flowering

et al. 2013

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“…The lowest GDD (540, base 58C) for the May to June period for the years 1985Á2006 were recorded in 1992 at the MCRS. The required threshold of a photoperiod ]13.75 h with GDD of ]600 for bulb formation (Lancaster et al 1996) may have been shortened due to overcast conditions caused by accumulated volcanic ash. Cool summers are also associated with late maturity and thick-necked onions (Brewster et al 1987), which in turn affect marketable yield.…”

Section: Discussionmentioning

confidence: 99%

Consistency of long-term marketable yield of carrot and onion cultivars in muck (organic) soil in relation to seasonal weather

Tesfaendrias¹,

McDonald²,

Warland³

2010

Can. J. Plant Sci.

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Tesfaendrias, M. T., McDonald, M. R. and Warland, J. 2010. Consistency of long-term marketable yield of carrot and onion cultivars in muck (organic) soil in relation to seasonal weather. Can. J. Plant. Sci. 90: 755Á765. To identify carrot and onion cultivars that provide consistent marketable yields, we tracked the yields of five fresh market carrot [Daucus carota L. subsp. sativus (Hoffm.) Arcang.] and six onion (Allium cepa L.) cultivars for at least 13 yr. Relationships between longterm weather variables and marketable yields were also investigated. The effects of cultivar, year and cultivar)year interactions on yield of carrots and onions were assessed. Cultivar and year had significant effects on carrot and onion yields, while the interaction was significant in only one of four data sets of carrot yield. Carrot cv. Cellobunch (95.4 t ha(1 ) and onion cv. Corona (74.1 t ha(1 ) had the highest mean marketable yields over the years studied. There was a slight positive correlation between mean yield of the assessed carrots and maximum temperatures in September (r 00.44). Mean carrot yield was also somewhat negatively correlated with total rainfall in July (r 0(0.43) and with number of days with rain in August (r 0(0.43) and September (r 0(0.44). Most onion cultivars showed stronger relationships between marketable yield and various weather patterns. Marketable yield of onions increased with an increase in the number of days with rainfall in June (r 00.57). The mean marketable yield of the six onion cultivars decreased in relation to temperatures ]308C in June (r 0(0.55) and August (r 0(0.53). The mean yield of all the onions in the trials was negatively correlated (r 0(0.78) with growing degree days (base 58C, May to August). The results indicated that the data from long-term cultivar trials can be used to identify cultivars that yield well despite seasonal variations in weather. Le rendement moyen de carottes pre´sente aussi une le´ge`re corre´lation ne´gative avec l'importance des pre´cipitations en juillet (r 0(0,43) ainsi qu'avec le nombre de jours de pluie au mois d'aouˆt (r 0(0,43) et en septembre (r 0(0,44). Pour la plupart des varie´te´s d'oignon, on note de fortes relations entre le rendement commercialisable et diverses conditions atmosphe´riques. Ainsi, le rendement commercialisable des oignons augmente avec le nombre de jours de pluie en juin (r00,57). Le rendement commercialisable de six cultivars d'oignons diminue aussi quand la tempe´rature est e´gale ou supe´rieure a`308C en juin (r 0(0,55) et en aouˆt (r0(0,53). Lors des essais, le rendement moyen des oignons pre´sentait une corre´lation ne´gative (r 0(0,78) avec le nombre de degre´s-jours de croissance (tempe´rature de base de 58C, de mai a`aouˆt). Les re´sultats indiquent qu'on peut se servir des re´sultats des essais a`long terme sur les cultivars pour identifier les varie´te´s donnant un bon rendement en de´pit des variations climatiques saisonnie`res.

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“…Plant yield is reflecting the results of photosynthesis conducted in plant leaves. The leaf area is affected by number of leaves and hereafter the capacity of the plant to conduct photosynthesis and thus the potential to form bulb [18]. When plant has more leaves, it can produce more photosynthates that are accumulated in the sink to gain yield (bulb).…”

Section: Resultsmentioning

confidence: 99%

Application of Granular Organic Fertilizer to Improve Yield of Red Onion

2017

IJAAEE

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Abstract-The aim of this research was to study the effect of own formulated granular organic fertilizer application on growth and yield of red onion. The experiment was arranged in a Randomized Completely Block Design. The treatment was the doses of granular organic fertilizer (10 ton/ha; 20 ton/ha; 30 ton/ha) with the control using recommended doses of inorganic fertilizers. Red onions were planted in polybags with treatment according to the experimental design, each treatment consisted of 10 polybags and repeated five times. The results showed that up to 8 weeks after planting (wap), the height of red onion did not significantly affected by the use of granular organic fertilizer or inorganic fertilizers (control). At the age of 8 wap, plants treated with granular organic fertilizer had significantly more leaves than those with inorganic fertilizers. Different doses of granular organic fertilizer did not significantly affect the number of onion leaves. Red onion treated with granular organic fertilizer significantly produced higher yield that those treated with inorganic fertilizer. This suggests that granular organic fertilizer can replace the use of inorganic fertilizer for red onion cultivation.

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Bulbing in Onions: Photoperiod and Temperature Requirements and Prediction of Bulb Size and Maturity

Cited by 70 publications

References 16 publications

FLOWERING LOCUS T genes control onion bulb formation and flowering

FLOWERING LOCUS T genes control onion bulb formation and flowering

Consistency of long-term marketable yield of carrot and onion cultivars in muck (organic) soil in relation to seasonal weather

Application of Granular Organic Fertilizer to Improve Yield of Red Onion

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