scholarly journals Influence of bee pollination on quality and quantity of onion (Allium cepa L.) seed

2020 ◽  
Vol 13 (2) ◽  
pp. 200-204
Author(s):  
Subhash B. Kandakoor ◽  
Jitendra Kumar S. Hilli
Keyword(s):  
Allium Cepa ◽  
Seed Weight ◽  
Seed Set ◽  
Maximum Activity ◽  
Major Contributor ◽  
Flowering Stage ◽  
Bee Pollination ◽  
Allium Cepa L ◽  
Bee Colonies ◽  
Number Of Seeds

The activity of bees pollination in onion was observed throughout the day. Numerically maximum activity was observed during afternoon hours (12.00 to 2.00 PM) with 7.00 numbers in rock bee, 5.40 in Indian bees, 11.60 in little bees and 7.80 in case of dammer be, respectively. Among the four species of bees, little bees were more in entire day with highest of 111.60 bees/10 inflorescence/ minute followed by dammer bee with 9.40 bees/10 inflorescence/ minute, Among the bees major contributor was little bee, this may be due to more colonies of little bees in that area and destruction of rock bee colonies. Also, the bee acitivty was observed maximum number at 100 per cent flowering stage. The observations on number of seeds per umbel, 1000 seed weight and per cent germination under the laboratory conditions. The results clearly indicated that, maximum number of seeds per umbel was observed in open pollinated flowers with 339.30 ± 60.27 seeds per umber where all the four species of bees were made visits regularly followed by in case of pollination in mesh cloth cage with bees with 330.00±35.80 and very least number of seed set was observed in case of pollination in mesh cloth cage without bees with only 60.70 seeds/umbel. Similarly, 1000 seed weight also differed significantly in case of pollination with bees and without bees. In case of with bees it weighed around 3.37 g/1000 seeds followed by 3.10 g/1000 seeds in onion with bee cage and least in case of control with only 1.97 g/1000 seeds.

Pollination and Seed Set of Banksia spinulosa: Evidence for Autogamy

1988 ◽  
Vol 36 (6) ◽  
pp. 633 ◽  
Author(s):  
G Vaughton
Keyword(s):  
New England ◽  
Breeding System ◽  
Seed Weight ◽  
National Park ◽  
Fruit Set ◽  
Seed Set ◽  
Pollen Vectors ◽  
Specific Variation ◽  
Number Of Seeds

The breeding system of Banksia spinulosa var. neoanglica in the New England National Park was examined by excluding pollen vectors and hand pollinating inflorescences. Fruit set of xenogamous and open inflorescences was greater than geitonogamous and autogamous treatments, although not all differences were significant. No differences were found in the number of seeds per follicle or seed weight between treatments. A reduced number of follicles and smaller seeds occurred in the apical third of inflorescences in all treatments. This report of autogamous seed set contrasts with previous findings for this species and indicates intra-specific variation in the breeding system.

scholarly journals VARIABILITY AND CHARACTER ASSOCIATION FOR REPRODUCTIVE TRAITS IN ONION (Allium cepa L)

2011 ◽  
Vol 24 (1) ◽  
pp. 27-32
Author(s):  
M. S. Akter ◽  
N. A. Ivy ◽  
M. A. K. Mian ◽  
M. M. Hoque
Keyword(s):  
Allium Cepa ◽  
Direct Effect ◽  
Seed Yield ◽  
Reproductive Traits ◽  
Phenotypic Correlation ◽  
Allium Cepa L ◽  
Character Association ◽  
Positive Direct ◽  
Number Of Seeds ◽  
Filled Seeds

The experiment was conducted with the objective to study the variability and the character association for reproductive traits in exotic and local onion genotypes. Ten genotypes of onion (Allium cepa L) collected from different sources, namely; Indian medium (G1), Indian medium (G2), Indian small (G3), Taherpuri (G4), Patnai pink (G5), Patnai small (G6), Big single bulb (G7), Big double bulb (G8), Small single bulb (G9), Small double bulb (G10) were included in the study. Significant variations were observed among the genotypes for all the characters at 1% level except umbel diameter. This indicates that there is a wide genotypic variation among the genotypes for all the characters studied except umbel diameter. Considering genetic parameters, high GCV values were observed for days to 100% sprouting, number of unfilled seeds per umbel, number of filled seeds per umbel, number of flowers per umbel, number of seeds per umbel, number of seeds per plant and seed yield per umbel (gm). High heritability values with high genetic advances in percent of mean were obtained for days to 100% sprouting, days to 50% bolting, number of unfilled seeds per umbel and seed yield per umbel (gm). Correlation analysis indicated significant positive genotypic and phenotypic correlation coefficient of number of seeds per plant, 100 seed weight (gm), number of seeds per umbel and number of unfilled seeds per umbel with seed yield per umbel (gm). Number of flowers per umbel and number of filled seeds per umbel had the highest positive direct effect on seed yield (gm). Days to 100% sprouting, umbel diameter and number of seeds per plant had direct negative effect on seed yield. Path analysis exhibited that highly significant positive correlation with positive direct effect showed for number of filled seeds per umbel (1.87), number of flowers per umbel (1.52) and 100seed weight (0.74g). Days to 50% bolting, number of seeds per plant, number of flowers per umbel, number of filled seeds per umbel, number of unfilled seeds per umbel and seed yield per umbel could be selected as yield contributing characters in onion.

scholarly journals Effect of bulb size on selected morphological characteristics of seed stalks, seed yield and quality of onion (Allium cepa L.) seeds

2009 ◽  
Vol 21 (1) ◽  
pp. 27-38 ◽  
Author(s):  
Maria Morozowska ◽  
Roman Hołubowicz
Keyword(s):  
Allium Cepa ◽  
Seed Yield ◽  
Morphological Characteristics ◽  
Germination Energy ◽  
Yield And Quality ◽  
Allium Cepa L ◽  
Entire Plant ◽  
One Year ◽  
Number Of Seeds

Abstract In the years 2002 − 2004 research was carried out on the effect of onion (Allium cepa L.) ‘Wolska’ bulb size on selected morphological characteristics of seed stalks, seed yield and quality. Commercial bulbs (vernalised, one-year-old mother bulbs) were divided into three groups: small, medium and large, with diameters of 4.2-5.3 cm, 5.4-6.3 cm and 6.4-8.5 cm, respectively. Then, the bulbs of each group were planted in the field and grown routinely with the purpose of producing seeds. The following characters were measured on the seed stalks: number and height of seed stalks grown out from one bulb, the seed stalks’ diameter at the height of 10 cm above the ground, the diameter of the inflorescence, seed yield from a single stalk and from the entire plant, the weight of 1000 seeds, number of seeds in 1 g, length and width of the seeds, length and width of the embryos, and germination energy and capacity. Our experiments showed a significant influence of bulb size on the number of seed stalks and the inflorescence diameter. It was discovered that the big bulbs gave larger numbers of seed stalks than the seed stalks grown from the medium and small ones. Small bulbs gave seed stalks with smaller inflorescences than the medium and large ones. The bulb size had no effect on the seed stalk height or their diameter when measured at the level of 10 cm above the ground. The bulb size also did not affect seed yield per one seed stalk, but it did affect the seed yield obtained from the entire plant, which was bigger for plants grown from large bulbs in comparison with the small ones. The size of the bulbs had no effect on either the weight of 1000 seeds or the number of seeds in 1 g. It did not affect either the seed and embryo length and width or the seed germination energy and capacity.

scholarly journals Effect of bulb size and plant spacing on seed production of onion (Allium cepa L.)

2012 ◽  
Vol 37 (3) ◽  
pp. 405-414 ◽  
Author(s):  
Md. Asaduzzaman ◽  
Md. Mainul Hasan ◽  
Md. Mahmudul Hasan ◽  
Md. Moniruzzaman ◽  
Mohammad Humayun Kabir Howlander
Keyword(s):  
Field Experiment ◽  
Seed Production ◽  
Allium Cepa ◽  
Seed Yield ◽  
Seed Weight ◽  
Plant Spacing ◽  
Allium Cepa L ◽  
Onion Seed

A field experiment was conducted at the `Research Farm` of Regional Seed Production Office of Lal Teer Seed Limited, Dinajpur, Bangladesh during November 2008 to April 2009. The study was conducted to investigate the effect of bulb size and planting spacing on seed production of cultivar Taherpuri onion. Three bulb sizes [small (5±2g), medium (10±2g), and large (15±2g)] and four planting spacing [closest 25×15, closer 25×20, wider 30×15, and widest 30×20cm] was considered in this experiment. Number of flowering stalks, length of flowering stalks, number of umbels per plant, number seeded fruits, seed weight per umbel, 1000-seed weight and seed yield per hectare were measured to assess the onion seeds. The results revealed that the highest seed yield (776.67 kg) per hectare was obtained from the large bulb (15±2g) with the closest spacing of 25×15cm followed by small bulb size of same spacing. The maximum number of flowers per umbel (371.39), seed weight per umbel (0.80g) and 1000-seed weight (3.92g) were obtained from the largest bulb size (15±2g) with widest (30×20cm) planting spacing. Hence, large bulb size with closest plant spacing is suggested for onion seed production in northern part of Bangladesh. Bangladesh J. Agril. Res. 37(3): 405-414, September 2012 DOI: http://dx.doi.org/10.3329/bjar.v37i3.12084

Effect of De-Branching on the Yield and Yield Components of Mustard (Brassica juncea)

1987 ◽  
Vol 23 (4) ◽  
pp. 395-400
Author(s):  
Y. S. Chauhan ◽  
S. C. Bhargava ◽  
D. P. S. Tomar
Keyword(s):  
Brassica Juncea ◽  
Seed Yield ◽  
Yield Components ◽  
Seed Weight ◽  
Flowering Stage ◽  
Yield And Yield Components ◽  
Basal Portion ◽  
Number Of Seeds

SUMMARYBranches are an important yield attribute of the mustard (Brassica junceo)crop. However, not all the branches are equally productive and some of those arising from the basal portion of the plant may form parasitic sinks for assimilates. The effect of de-branching at the 50% flowering stage in the apical (AHD) and the basal halves (BHD) of two mustard genotypes, Pusa Bold and Varuna, was examined. The BHD treatment increased the seed yield per plant of Pusa Bold by 36% and of Varuna by 75% over the control. The increase in yield due to the BHD treatment was mainly due to an improvement in the total number of pods per plant in both genotypes. In Pusa Bold, an improvement in both 1000-seed weight and number of seeds per pod, mainly on late formed branches, was also observed. The AHD treatment reduced seed yield but not significantly so. The results suggest that improvement in the yield of mustard cultivars by suppressing branching on the basal portion of plants should be possible.

scholarly journals Effect of bee pollination on yield and yield components of field bean (Vicia faba L.)

1990 ◽  
Vol 62 (1) ◽  
pp. 45-49 ◽  
Author(s):  
Anna-Liisa Varis ◽  
Raija Brax
Keyword(s):  
Vicia Faba ◽  
Yield Components ◽  
Field Bean ◽  
Small Field ◽  
Bee Pollination ◽  
Yield And Yield Components ◽  
Vicia Faba L ◽  
Bee Colonies ◽  
Number Of Seeds

The effect of bees on the yield of field bean (Vicia faba L.) was studied in cage experiments in southern Finland during two successive years. Comparisons were made between field cages with and without honeybees and open-pollinated uncaged controls. Effect of shading was also considered. The yield in open plots, which were freely visited by pollinators, was considerably greater than in plots from which the insects were excluded. Freely visited plants and plants caged with bees produced about twice as many seeds as plants caged without bees, and the number of seeds per pod was also higher. The plants were tallest in cages without bees. In open plots, 44 % of the bee visitors were honeybees, 56 % being bumblebees. The higher number of seeds obtained with honeybee pollination indicates that honeybees are able to pollinate the field bean flowers in the conditions prevalent in Finland. – It is concluded that there is little value in introducing bee colonies in small field bean areas and places where bumblebees are fairly abundant. Honeybees may improve the yield in larger fields, where natural pollinators are often scarce.

scholarly journals Variability and Interrelationship among Yield and Yield Contributing Characters in Onion (Allium cepa L.)

1970 ◽  
Vol 16 ◽  
pp. 85-88
Author(s):  
MS Hossain ◽  
M Khalekuzzaman ◽  
MH Rashid ◽  
MS Rahman
Keyword(s):  
Plant Height ◽  
Allium Cepa ◽  
Yield Components ◽  
Correlation Coefficients ◽  
Phenotypic Correlation ◽  
Fresh Weight ◽  
Allium Cepa L ◽  
High Heritability ◽  
Coefficients Of Variations ◽  
Number Of Seeds

A study was conducted using seven varieties of onion (Allium cepa L.) and observations were recorded on yield and yield components in order to obtain informations on genetic variability and character association of onion. Higher genotypic coefficients of variations were recorded in number of seeds per scape (NSPS), final plant height (FPH), final scape height , fresh weight of bulb and bulb length. These characters also exhibited high heritability along with high genetic advance as percentage of mean. Phenotypic correlation coefficients showed that bulb length, bulb diameter and scape diameter were positively and significantly correlated with fresh weight of bulb. The number of seeds per scape, final scape height, final plant height and number of pseudostem branches at maximum flowering stage were also positively and significantly correlated with seed yield per scape. Key words: Genetic variations, correlation, yield components, onion.   DOI:10.3329/jbs.v16i0.3746 J. bio-sci. 16: 85-88, 2008  

STUDY OF EFFECT OF EMS, MMS AND GR ON YIELD CONTRIBUTING TRAITS IN URDBEAN, VIGNA MUNGO

2017 ◽  
Vol 23 (1) ◽  
Author(s):  
A. B. SAGADE
Keyword(s):  
Plant Height ◽  
Seed Yield ◽  
Seed Weight ◽  
Inhibitory Effect ◽  
Individual Plant ◽  
Mean Values ◽  
Methane Sulphonate ◽  
Pod Length ◽  
100 Seed Weight ◽  
Number Of Seeds

The study of the effect of three well known mutagens, ethyl methane sulphonate (EMS), methyl methane sulphonate (MMS) and gamma rays (GR) on the yield contributing traits of the urdbean variety TPU-4 were carried out in the M3 generation. Effect of selected mutagenic treatments/doses of EMS (0.02, 0.03 and 0.04 M), MMS (0.0025, 0.05 and 0.01 M) and (GR) (30, 40 and 50 KR) on different yield contributing traits like plant height, plant spread, number of pods per plant, pod length, number of seeds per pod, seed yield per plant and 100 seed weight were analyzed in the M3 populations of the variety TPU-4. Seeds of M2 plants and control were harvested separately and sown to raise M3 population.. Genetic variabilty in the mutagen administered M3 progeny of the urdbean variety TPU-4 was analyzed by employing statistical methods. Data on mean values and shift in the mean of seven quantitative traits was evaluated on individual plant basis. The experimental findings revealed that concentrations / dose of the all these mutagens showed inhibitory effect on plant height, number of pods per plant, pod length and number of seeds per pod. Lower concentrations of mutagens exerted a promotory effect on plant spread, 100 seed weight and seed yield per plant while higher concentrations of these mutagens inhibited them to different extent.

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