The bulbing response to day length and temperature of some Australasian cultivars of onion (Allium cepa L.)

1980 ◽  
Vol 31 (3) ◽  
pp. 511 ◽  
Author(s):  
BT Steer
Keyword(s):  
Allium Cepa ◽  
Low Temperatures ◽  
Day Length ◽  
Leaf Base ◽  
Base Diameter ◽  
Long Day ◽  
Lateral Buds ◽  
Temperature Regimes ◽  
Allium Cepa L ◽  
Neck Diameter

Onions (Allium cepa L.) were grown in the Canberra phytotron from seed to bulb in three day lengths (11, 14 and 17 h) and five temperature regimes (day/night 18/10�, 22/14�, 26/18�, 30/22�, 34/26�), The cultivars Creamgold, Braeside Golden Globe, Gladalan Brown and Early Lockyer Brown were used. There was a significant interaction of cultivar, day length and temperature on bulbing. Bulbing was most rapid at the highest temperature and longest day length. Creamgold exhibited a temperature dependence in bulbing, so that at 18/10�C bulbing did not occur at any day length. The other cultivars bulbed at low temperatures. Lateral buds developed in Braeside Golden Globe, but not at low temperatures (18/10�) or in long day lengths (14 or 17 h) where normal bulbs were produced. In an attempt to simulate field conditions more closely, some plants were transferred to different day length and temperature treatments between sowing and harvest. During development, neither bulbing ratio (leaf base diameter/neck diameter) nor final bulb size was significantly different from those of plants grown from seed to maturity in one regime. Bulbing required the continual presence of bulb-inducing conditions: bulb development ceased on transfer to unfavourable conditions (short day lengths, low temperature).

scholarly journals Sugars and pungency of different day length adapted onions (Allium cepa L.) grown in long day temperate climate of Kashmir valley

2020 ◽  
Vol 8 (4) ◽  
pp. 3790-3794
Author(s):  
Geetika Malik ◽  
Alima Shabir ◽  
Rafiq Ahmad Shah ◽  
Roman Nissar ◽  
Lubna Masoodi ◽  
...  
Keyword(s):  
Allium Cepa ◽  
Day Length ◽  
Temperate Climate ◽  
Kashmir Valley ◽  
Long Day ◽  
Allium Cepa L

Bulbing in Long-day Onion (Allium cepa L.) Cultured In Vitro: Comparison Between Sugar Feeding and Light Induction

1992 ◽  
Vol 69 (6) ◽  
pp. 551-555 ◽  
Author(s):  
RÉMI KAHANE ◽  
BERNARD TEYSSENDIER DE LA SERVE ◽  
MICHEL RANCILLAC
Keyword(s):  
Allium Cepa ◽  
Light Induction ◽  
Long Day ◽  
Sugar Feeding ◽  
Allium Cepa L ◽  
In Vitro Comparison

scholarly journals Comparison of the ability of fifteen onion (Allium cepa L.) cultivars to accumulate nitrates

2014 ◽  
Vol 67 (1) ◽  
pp. 27-32 ◽  
Author(s):  
Renata Wojciechowska ◽  
Anna Kołton
Keyword(s):  
Allium Cepa ◽  
Negative Correlation ◽  
Dry Matter ◽  
Significant Negative Correlation ◽  
Matter Content ◽  
Nitrate Content ◽  
Dry Matter Content ◽  
Long Day ◽  
Allium Cepa L ◽  
The University

<p>The aim of a two-year study was to characterise selected <em>Allium cepa </em>L. genotypes with regard to their ability to accumulate nitrates in bulbs as well as to search for a possible relation between NO<sub>3</sub><sup>-</sup> concentration and dry matter content. Fifteen cultivars of edible onion, mostly of long-day genotype with different growing periods, bulb size and skin colour, were taken for the experiment. Seeds of particular cultivars were obtained from the following seed companies: Spójnia Nochowo (‘Labrador’, ‘Takstar F<sub>1</sub>’,‘Tęcza’, ‘Warna’, ‘Zorza’), Polan (‘Polanowska’, ‘Topolska’), PlantiCo Gołębiew (‘Alibaba’, ‘Efekt’, ‘Kristine’, ‘Niagara F<sub>1</sub>’),and PlantiCo Zielonki (‘Bila’, ‘Irka’, ‘Wenta’, ‘Zeta’). Plants produced from seedlings were grown in the experimental field of the University of Agriculture in Kraków. After crop harvesting and additional drying, nitrate and dry matter content in bulbs of all cultivars were measured.</p><p>The following cultivars: ‘Efekt’, ‘Labrador’ and red-skinned ‘Wenta’, were characterized by the lowest ability to accumulate NO<sub>3</sub><sup>-</sup> in bulbs. The highest nitrate content was noted in bulbs of ‘Takstar F<sub>1</sub>’ (a very early-season cultivar), followed by ‘Bila’ and ‘Tęcza’. A weak, yet statistically significant negative correlation between nitrate and dry matter content was observed. The highest dry matter content was determined in bulbs of white-skinned ‘Alibaba’, while the lowest – in brown-skinned ‘Labrador’.</p>

scholarly journals IDENTIFICATION OF BULBING HORMONE GENES IN ONION (Allium cepa)

2015 ◽  
Vol 2 (1) ◽  
pp. 630
Author(s):  
Minami Tagashira ◽  
Tsuyoshi Kaneta
Keyword(s):  
Allium Cepa ◽  
Expression Analysis ◽  
Higher Plants ◽  
Day Length ◽  
Induction Medium ◽  
Cdna Clones ◽  
Bulb Formation ◽  
Allium Cepa L ◽  
High Efficient ◽  
Shoot Induction Medium

<p>Initiation of onion (Allium cepa L.) bulb formation seems to require “bulbing hormone” which has been considered to be produced in leaf blades in response to the stimulus of long day conditions. But “bulbing hormone” is not yet identified. Previous study revealed a protein called Flowering locusT (FT) as flowering hormone, florigen. FT act for flowering by change on the day length on the higher plants. Objective of this study is identify”bulbing hormone” in onion plants. Method used in this study are cloning gene and gene expression analysis of the FT in onion plants.Full length of cDNA was cloned by the degenerate PCR and 5’­and 3’-RACE method.As a result, six kinds of full length cDNA clones for FThomologs in onion plants were obtained.These genes were named AcFT1 to6. By expression analysis of these genes, AcFT4, 5 and 6,expression increased as it got closer to a condition in long days in association with the bulbing of onion. Furthermore, in order to investigate the functions of these genes, we optimize transformation methods for onion plants. Medium containing 2,4-Dand kinetin showed high efficient plant regeneration from seed-derived callus of onion. Medium containing 2,4-D and kinetin as plant growth regulators is effective for induction of shoot-inducible callus, and advance shoots were developed from the callus on the shoot induction medium which contained thidiazuron, benzyl adenine or trans-zeatin as cytokinins. In conclusion, bulbing hormone in onion plants were possibly gene AcFT4, 5,6.</p><p><br /><strong>Keywords</strong> : Allium cepa L, bulbing hormone gene, Flowering locusT</p>

Influence of photoperiod and temperature on developmental time and number of molts in nymphs of two species of Odonata

1976 ◽  
Vol 54 (12) ◽  
pp. 2033-2045 ◽  
Author(s):  
Byron R. Ingram ◽  
Charles E. Jenner
Keyword(s):  
North Carolina ◽  
High Temperature ◽  
Developmental Time ◽  
Photoperiodic Response ◽  
Day Length ◽  
Long Day ◽  
Temperature Regimes ◽  
Photoperiodic Responses

Nymphs of the damselflies Enallagma hageni and Enallagma aspersum were collected in North Carolina from August to March and subjected to 11- and 14-h photoperiods at 16 and 21 °C. Development was generally completed more rapidly under long-day conditions. Under all day-length and temperature regimes, developmental time from the middle instars to emergence decreased from a maximum for those nymphs collected in August to a minimum for those collected in March. The two species had similar developmental times under long photoperiods at 21 °C; short photoperiods, however, were more inhibitory to the growth of E. hageni than to E. aspersum. The photoperiodic responses of E. hageni were similar at both temperatures, the developmental times being only slightly slower at 16 °C. In contrast, nymphs of E. aspersum kept at 16 °C showed no photoperiodic response. In both species, diapause or prolonged development occurred primarily in the two instars before the final, but not in the final itself.Extra molts usually accompanied slow developmental times in both species, regardless of photoperiod. The incidence of extra molting was greatest under conditions combining high temperature and short daylength. Extra molts were apparently common in field populations of E. aspersum, but were rare in those of E. hageni.

Studies on genetic variability, heritability and genetic advance in long day onion (Allium cepa L.) genotypes

2019 ◽  
Vol 51 (1) ◽  
pp. 92
Author(s):  
Raj Narayan ◽  
D. B. Singh ◽  
Arun Kishor ◽  
Mukesh Singh Mer
Keyword(s):  
Genetic Variability ◽  
Allium Cepa ◽  
Genetic Advance ◽  
Long Day ◽  
Allium Cepa L

Translocation of Photosynthate in Bulbing Onions

1983 ◽  
Vol 10 (6) ◽  
pp. 515 ◽  
Author(s):  
JD Mann
Keyword(s):  
Allium Cepa ◽  
Mature Leaf ◽  
Leaf Base ◽  
Allium Cepa L ◽  
Treated Leaf ◽  
Local Supply

[14C]urea was injected into the leaf lumens of growing onion plants (Allium cepa L.) and the redistribution of photosynthate was investigated after 24 h. Injections were into either an older mature leaf or into a younger recently enlarged leaf. Most of the photosynthate was retained either in the green blade of the treated leaf or in the enlarged leaf base (scale) of that leaf. Of the relatively little photosynthate exported, most went to the innermost scales, especially during bulb enlargement. The innermost (younger) scales acquired photosynthate from both the nearby leaves and from the more remote older leaves. Relatively small levels of radioactivity were found in other leaf blades. Roots obtained small amounts of photosynthate from the oldest leaves. No label was exported to scales of outer leaves. This pattern was modified, however, by excising photosynthetic area of such leaves. Scales of intermediate age, when deprived of a local supply of photosynthate, acquired translocated material from both older and younger scales. This alteration in source of photosynthate took less than 24 h to develop.

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