Depth of root placement, root size and carbon reserves determine reproduction success of aspen root fragments

2014 ◽  
Vol 313 ◽  
pp. 83-90 ◽  
Author(s):  
Julia Wachowski ◽  
Simon M. Landhäusser ◽  
Victor J. Lieffers
Keyword(s):  
Reproduction Success ◽  
Root Size

scholarly journals 108 SEX DIFFERENCES IN AORTIC ROOT SIZE IN CHILDREN BY ECHOCARDIOGRAPHY

1978 ◽  
Vol 12 ◽  
pp. 381-381
Author(s):  
Lily George ◽  
James W Mathewson ◽  
Anthony A Demaria ◽  
Dean T Mason ◽  
Eli Gold
Keyword(s):  
Sex Differences ◽  
Aortic Root ◽  
Root Size

The effects of grazing on the phosphorus requirement of an annual pasture

1971 ◽  
Vol 22 (1) ◽  
pp. 81 ◽  
Author(s):  
PG Ozanne ◽  
KMW Howes
Keyword(s):  
Subterranean Clover ◽  
Growing Season ◽  
Maximum Growth ◽  
Grazing Pressure ◽  
Light Interception ◽  
Botanical Composition ◽  
Stocking Rate ◽  
Phosphorus Requirement ◽  
Root Size

The applied phosphorus requirement of a pasture sown to subterranean clover was measured with and without grazing. Under moderate grazing pressure, in the year of establishment, the pasture required about 50 % more phosphorus than when ungrazed. In the following season, at a higher stocking rate, the grazed areas needed twice as much phosphorus as the ungrazed to make 90% of their maximum growth. In both years this difference in requirement between stocked and unstocked treatments was present throughout the growing season. Increased phosphorus requirement under grazing is associated with the need for greater uptake of phosphorus under conditions where redistribution of absorbed phosphorus within the plant is prevented by defoliation. It does not appear to be due to effects of defoliation on root size. Nor does it depend on differential light interception or on changes in botanical composition.

Studies on some sources of variation in carrot root weight

1981 ◽  
Vol 96 (3) ◽  
pp. 549-556 ◽  
Author(s):  
P. J. Salter ◽  
I. E. Currah ◽  
Jane R. Fellows
Keyword(s):  
Population Density ◽  
Seedling Emergence ◽  
Size Variation ◽  
Root Weight ◽  
Low Density ◽  
Plant Variation ◽  
Sowing Depth ◽  
Seedling Size ◽  
Weight Variation ◽  
Root Size

SUMMARYFive investigations were carried out to determine the magnitude of root-size variation within crops of cv. Chantenay Supreme grown under competitive and non-competitive conditions, and to study possible sources of inter-plant variation.In the first experiment root-size variation from crops grown at a high population density (245 plants/m2) and at a low density (25 plants/m2) were compared over a 21-week period from sowing. The c.v.s of root weight were always higher from the high density than from the low density over the harvesting period from 11 to 21 weeks after sowing, and ranged from 74 to 94% and from 50 to 63%, respectively. A second study showed that even with a very low population density (3 plants/m2) the c.v. of root weight at harvest was 58%. The third study showed that 40% of the root weight variation was accounted for by the time of seedling emergence. The results of a pot experiment indicated that when the size of seed, sowing depth, rooting medium and time of seedling emergence were made as uniform as possible, a very uniform population of roots was produced with a c.v. of root weight of 32%. In the final field experiment when time of seedling emergence, seed size and spatial distribution of the plants were the experimental variables, the results confirmed the importance of variability in time of seedling emergence and seedling size in creating variation at an early stage of growth.The results of these studies indicate that competition per se was not a prime source of variation in root size but magnified any initial variation within the crop at the time of seedling establishment. The importance of this early establishment phase in determining the spread of root-size distribution within a crop is discussed together with the factors which influence the time of seedling emergence and seedling size.

scholarly journals Increased Aortic Root Size is Associated with Nocturnal Hypoxia and Diastolic Blood Pressure in Obstructive Sleep Apnea

SLEEP ◽  
2011 ◽  
Vol 34 (11) ◽  
pp. 1605-1607 ◽  
Author(s):  
Jean-Philippe Baguet ◽  
Caroline Minville ◽  
Renaud Tamisier ◽  
Frederic Roche ◽  
Gilles Barone-Rochette ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Obstructive Sleep Apnea ◽  
Sleep Apnea ◽  
Diastolic Blood Pressure ◽  
Aortic Root ◽  
Obstructive Sleep ◽  
Root Size

HAIRY ROOT TRANSFORMATION SYSTEM IN LARGE-SEEDED GRAIN LEGUMES

1995 ◽  
Vol 43 (1) ◽  
pp. 1-5 ◽  
Author(s):  
H.J. Siefkes-Boer ◽  
M.J. Noonan ◽  
D.W. Bullock ◽  
A.J. Conner
Keyword(s):  
Vicia Faba ◽  
Hairy Root ◽  
Hairy Roots ◽  
Faba Bean ◽  
Grain Legumes ◽  
Transformation System ◽  
Root Transformation ◽  
Specific Strain ◽  
Size And Morphology ◽  
Root Size

Hairy roots were produced on faba bean (Vicia faba L.) and chickpea (Cicer arietinum L.) plants by inoculation with Agrobacterium root-inducing strains. Examination of 14 plant genotypes and eight Agrobacterium strains in all possible combinations revealed specific strain/genotype interactions. Hairy root size and morphology differed substantially between faba bean and chickpea hairy roots. Sixty percent of chickpea hairy roots were 10–15 mm in length and forty percent, 15–25 mm. All were <1.0 mm in thickness. Sixty-three percent of faba bean hairy roots were 15–25 mm long and thirty-seven percent, 25–40 mm. All faba bean hairy roots were between 1.0 and 1.5 mm in thickness.

scholarly journals Rizobactérias no controle de Sclerotinia sclerotiorum, e efeitos no desenvolvimento vegetativo de plântulas de soja

2020 ◽  
Vol 16 (4) ◽  
pp. 110-120
Author(s):  
Renata Silva Canuto de Pinho ◽  
Bruna Canabarro Pozzebon ◽  
Ketlen Raisa Rey Rodrigues ◽  
Renata Bolacel Arns ◽  
Cezario Almeida Alves ◽  
...  
Keyword(s):  
Volatile Compounds ◽  
Sclerotinia Sclerotiorum ◽  
Mycelial Growth ◽  
Water Soluble ◽  
Alternative Methods ◽  
Yield Potential ◽  
Vegetative Development ◽  
Produce Water ◽  
Soybean Seedlings ◽  
Root Size

Sclerotinia sclerotiorumis one of the main pathogens of soybean crop, reducing crop yield potential and causing losses of up to 37%. Because it is a soil inhabitant, its management is difficult. However, the adoption of alternative methods, such as the use of antagonists, may help reduce the pathogen inoculum. Thus, the objective of this work was to select native soybean rhizobacteria and to verify the potential of in vitroantagonism against Sclerotinia sclerotiorum, as well as the effect of these isolates on the germination and vegetative developmentof soybean seedlings. For this, tests of inhibition and mycelial growth rate index, production of volatile compounds, production of rhizobacterial metabolites and vegetative development of soybean seedlings were conducted.With respect to antagonism, I1, U4, M6, M8 and U13 isolates were the most effective. For the production of volatile compounds by the overlapping plate method, isolates M8, M10, M9, I1, M6 and U4 had the largest reductions in pathogen mycelial growth. For the ability of isolates to produce water-soluble metabolites in culture medium, it was found that isolates I1, M3, M6 and U13 were the most effective. For the vegetative development of soybean seedlings, except for the root length, in which the isolates M8, I14, M9, I1, M6 and M10 provided the largest increases in root size, the other variables did not show significant increases when compared with the witness.In general, isolates M8, M10, M9, I1, M6 and U4 are effective in inhibiting mycelial growth of Sclerotinia sclerotiorum, produce volatile organic compounds that help control the pathogen, however, they do not show significant increases in the vegetative development of soybean seedlings.

Influences of spacing on yield and root size of carrot (Daucus carota L.) under ridge-furrow production

2021 ◽  
Vol 6 (1) ◽  
pp. 826-835
Author(s):  
Habtamu Tegen ◽  
Mnuyelet Jembere
Keyword(s):  
Production System ◽  
Field Experiments ◽  
Root Weight ◽  
Root Yield ◽  
Marketable Yield ◽  
Daucus Carota L ◽  
Production Practice ◽  
Raised Bed ◽  
System Information ◽  
Root Size

Abstract Although there is adequate information on the influence of plant population on root yield and size of carrot on flat and raised bed for rain fed production system, information on ridge-furrow bed preparation method is limited for irrigation production system. Therefore, in this study, field experiments were conducted for 2 years to determine the appropriate spacing of carrot on ridge-furrow carrot production practice under irrigation. Root yield increased significantly as the population increased. On the contrary, root size significantly decreased as population increased. The result of combined analysis over season and locations indicated that the narrowest spacing of 10 cm × 4 cm rows on the ridge and between plants, respectively, which accommodates 1,250,000 plants ha−1 gave significantly highest marketable carrot root yield of 26 t ha−1 followed by 22.6 t ha−1 with spacing of 20 cm × 4 cm which accommodates 1,000,000 plants ha−1, but it produced the smallest individual root weight of 83 g which is mostly preferred for household consumption unlike jumbo roots. Therefore, in terms of root sizes and marketable yield, the current study identified that spacing of 10 cm × 4 cm is optimum on ridge-furrow carrot production practices.

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