SOME ASPECTS OF THE RELATION BETWEEN NECTAR SECRETION AND NITROGEN, PHOSPHORUS, AND POTASSIUM NUTRITION

1957 ◽  
Vol 37 (3) ◽  
pp. 220-236 ◽  
Author(s):  
R. W. Shuel
Keyword(s):  
Red Clover ◽  
Inhibitory Effect ◽  
Threshold Concentration ◽  
Sand Culture ◽  
Nectar Secretion ◽  
High Concentration ◽  
Potassium Secretion ◽  
High Concentrations ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

The influence of mineral nutrition on nectar secretion both per se and in relation to certain aspects of growth and development was studied in snapdragon and red clover plants growing in sand culture. Snapdragon was grown at two levels each of nitrogen, phosphorus, and potassium, red clover at three levels each of phosphorus and potassium. The volume of nectar and weight of nectar sugar secreted per inflorescence were affected by the supply of each of the elements studied. Secretion in snapdragon was favoured by the lower levels of nitrogen, phosphorus, and potassium. Secretion in red clover was best at the low and intermediate levels of phosphorus and at the intermediate level of potassium. Although a high concentration of phosphorus or potassium in the mineral supply reduced secretion in both species, the threshold concentration for this inhibitory effect was higher in red clover than in snapdragon. High concentrations of potassium consistently reduced the sugar concentration of the nectar in both species. Flower number as well as quantity of secretion per inflorescence varied with nutritional treatment. For maximal production of nectar by the plant, the following conditions of fertility would appear desirable: A level of nitrogen low enough to avoid excessive vegetative growth, a level of phosphorus sufficient to promote good flowering, and a level of potassium which is neither low enough to limit growth severely nor high enough to reduce flower production.

A comparison of growth responses of Douglas fir and Sitka spruce to different nitrogen, phosphorus, and potassium levels in sand culture

1968 ◽  
Vol 46 (5) ◽  
pp. 531-537 ◽  
Author(s):  
R. van den Driessche
Keyword(s):  
Weight Ratio ◽  
Sitka Spruce ◽  
Douglas Fir ◽  
Response To Treatment ◽  
Sand Culture ◽  
Mineral Nutrient ◽  
Growth Responses ◽  
Net Assimilation ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

Douglas fir and Sitka spruce seedlings were grown in sand culture under controlled mineral nutrient conditions. Nitrogen, phosphorus, and potassium supply levels were varied one nutrient at a time in three separate experiments. The relative growth rate (RGR) of Sitka spruce was found to be higher than that of Douglas fir at high levels of N and K supply, although in all treatments the total dry matter production of Douglas fir was greater than that of Sitka spruce after 95 days. At low levels of P supply the RGR of Douglas fir was greater than that of Sitka spruce.Effects of treatment on RGR were apparently achieved mainly by their effect on net assimilation rate, but leaf weight ratio also showed a small, and significant, response to treatment.

scholarly journals Nutrient Interactions and Deficiency Diagnosis in the Lettuce

1955 ◽  
Vol 8 (3) ◽  
pp. 301 ◽  
Author(s):  
DW Goodall ◽  
AE Grant Lipp ◽  
WG Slater
Keyword(s):  
Plant Material ◽  
Dry Weight ◽  
Sand Culture ◽  
Nutrient Interactions ◽  
Stages Of Development ◽  
Culture Experiment ◽  
Foliage Plants ◽  
Phosphorus And Potassium ◽  
The Relationship ◽  
Nitrogen Phosphorus

A sand-culture experiment with lettuces is described, having as its principal purpose the study of the relationship between the potential responses of plants to applications of nitrogen, phosphorus, and potassium fertilizers and the composition of. their foliage. Plants were supplied initially with five levels of these nutrients in all combinations, samples of plant material were taken fot analysis at various stages of development, and at 44 days from sowing additional quantities of nutrients were supplied to some of the cultures in order that their response potentialities might be determined. The present paper analyses the effects of the nutrient interactions on plant dry weight, further results being left to subsequent papers.

scholarly journals Main soil nutrients dynamics in sod-dressing intercropped orchard

2021 ◽  
pp. 45-50
Author(s):  
A. G. Gurin ◽  
S. V. Rezvyakova ◽  
N. Yu. Revin
Keyword(s):  
Soil Nutrients ◽  
Active Substance ◽  
Red Clover ◽  
Fruit Trees ◽  
Dry Mass ◽  
Available Phosphorus ◽  
Growing Period ◽  
Phosphorus And Potassium ◽  
Bare Fallow ◽  
Nitrogen Phosphorus

The study aimed to estimate seasonal dynamics of soil nitrogen, phosphorus and potassium under the influence of sod grasses in a sod-dressing intercropped orchard. The trial was conducted in a Welsey apple 1987-year orchard. Trees were planted at 8×6 m, cultivar seedlings used as rootstock. Red clover and meadow timothy in variant shares were used for interrow sodding. The cereal—legume intercropping was done in 2015, preceded by a 180 kg/ha active substance phosphorus-potassium dressing in reserve. Nitrogen was applied annually prior to growing season at 34.4 kg/ha active substance. Grass biomass in first hay cutting was the highest and comprised 45.3-49.9 % total mass. A total four cuttings dry mass was 3.36-7.10 t/ha depending on scheme. The maximum biomass was registered for the schemes with red clover and meadow timothy at ratios 1:1 and 7:3 (6.52 and 7.10 t/ha). In the growing period, grass depleted soil for 111.1—219.9 kg/ha nitrogen, 21.5-42.7 kg/ha phosphorus and 209.3—380.8 kg/ha potassium. Such consumptions suggest a serious competition for soil nutrients between grass vegetation and fruit trees. The available phosphorus and potassium content was independent of interrow dressing schemes. Inter-scheme differences did not exceed experimental bias due to presowing phosphorus and potassium application in reserve before trial. By first cutting, the nitrate nitrogen soil content in sodding schemes was 1.5-2-fold less vs. bare fallow, i.e. more nitrogen is used by vegetating grass, and its available forms recover slower than being consumed.

Research on Application of Treating Beet Sugar Wastewater with IC Reactor

2014 ◽  
Vol 675-677 ◽  
pp. 440-443
Author(s):  
Rui Ying Lei ◽  
Yue Wang ◽  
Yong Feng Li
Keyword(s):  
Environmental Protection ◽  
Hydraulic Model ◽  
High Concentration ◽  
Internal Circulation ◽  
Fundamental Structure ◽  
Beet Sugar ◽  
Working Principle ◽  
Phosphorus And Potassium ◽  
Research On Application ◽  
Nitrogen Phosphorus

The beet sugar wastewater is a substance produced in the sugar process, which contains deep color and high concentration of nitrogen phosphorus and potassium. Treatments of beet sugar wastewater have been one of the most important challenges for environmental protection workers. Currently, treatments which are widely used in beet sugar wastewater processing are concentration drying, anaerobic method, aerobic method and incineration. The fundamental structure, working principle as well as hydraulic model of internal circulation (IC) reactor were introduced. The application and the possibility of using IC reactor to treat beet sugar wastewater were also concluded.

scholarly journals FECUNDITY OF THE ROOT WEEVILS BRACHYRHINUS SULCATUS AND SCIOPITHES OBSCURUS ON STRAWBERRY AT DIFFERENT CONDITIONS OF HOST PLANT NUTRITION

1965 ◽  
Vol 45 (3) ◽  
pp. 219-225 ◽  
Author(s):  
W. T. Cram
Keyword(s):  
Plant Nutrition ◽  
Nitrogen Nutrition ◽  
Sand Culture ◽  
Apparent Effect ◽  
Root Weevils ◽  
Black Vine Weevil ◽  
Cyclodiene Insecticides ◽  
Low Levels ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

Field applications to strawberry of nitrogen, phosphorus and potassium had no significant effect on the fecundity of the obscure root weevil, Sciopithes obscurus Horn, fed on detached leaflets in the laboratory, but when nitrogen was not applied there was a significant reduction in the fecundity of the black vine weevil, Brachyrhinus sulcatus (F.). With strawberry in sand culture, low levels of nitrogen had no apparent effect on the fecundity of S. obscurus but were associated with a significant reduction in the fecundity of B. sulcatus. Some association is suggested between the different effects of nitrogen nutrition on these species and their different susceptibilities to cyclodiene insecticides.

Accumulation and distribution of mineral elements in the annual lupins Lupinus albus L. and Lupinus angustifolius L

1978 ◽  
Vol 29 (2) ◽  
pp. 267 ◽  
Author(s):  
PJ Hocking ◽  
JS Pate
Keyword(s):  
Lupinus Albus ◽  
Sufficient Conditions ◽  
Mineral Elements ◽  
Sand Culture ◽  
Dry Matter Accumulation ◽  
Phosphorus And Potassium ◽  
Calcium Iron ◽  
Potassium Magnesium ◽  
Nitrogen Phosphorus ◽  
Iron And Manganese

The mineral nutrition of L. albus and L. angustifolius was studied under nutrient-sufficient conditions in sand culture. Mineral accumulation by both species was closely synchronized with dry matter accumulation. Fruits acquired major proportions of the nitrogen, phosphorus, potassium, magnesium and zinc of both species. Leaflets were major sites of accumulation of calcium, iron and manganese; stem and petioles accumulated substantial amounts of potassium, phosphorus, magnesium, copper and sodium. Intensities of intake of calcium, magnesium and iron by roots of L. angustifolius were higher than in L. albus. The situation was reversed for sodium. Cotyledon reserves of nitrogen, phosphorus, potassium and zinc were mobilized to seedling parts with 85–97% efficiency, other elements much less effectively. During fruiting, vegetative parts of the shoot showed net losses of 60–80% of their nitrogen, phosphorus and potassium, 20–50% of their magnesium, iron, zinc, manganese and copper, and less than 15% of their calcium and sodium. Mobilization from vegetative structures was generally more efficient in L. albus than in L. angustifolius. Leaflets showed higher mobilization efficiencies than stem and petioles. Post-anthesis mobilization furnished the equivalent of 23–59% of the fruit's intake of nitrogen, phosphorus, potassium, magnesium and manganese, 10–25% of the zinc, calcium, iron and copper, and 2% or less of the sodium. Nitrogen, phosphorus and potassium attained higher concentrations in fruits than in mature, non-reproductive parts; less mobile elements (calcium, sodium, iron and manganese) showed the opposite effect. Concentrations of sodium and manganese were especially low in fruits of L. angustifolius compared with L. albus.

scholarly journals Nutrient Interactions and Deficiency Diagnosis in the Lettuce III. Nitrogen Content and Response to Nitrogen

1957 ◽  
Vol 10 (3) ◽  
pp. 253 ◽  
Author(s):  
WG Slater ◽  
DW Goodall
Keyword(s):  
Dry Matter ◽  
Nitrate Nitrogen ◽  
Analytical Data ◽  
Sand Culture ◽  
Nutrient Interactions ◽  
Stages Of Growth ◽  
Matter Production ◽  
Subsequent Response ◽  
Phosphorus And Potassium ◽  
Nitrogen Phosphorus

Lettuce plants grown in sand culture, and receiving nitrogen, phosphorus, and potassium at five levels in all combinations, were analysed at different stages of growth for total, soluble, and nitrate nitrogen. An attempt was made to relate these analytical data to the subsequent response (in dry matter production) shown by the plants when a further amount of nitrogen was supplied.

Inhibitory effect of angiotensin II on renal tubular transport

1991 ◽  
Vol 260 (3) ◽  
pp. F340-F346 ◽  
Author(s):  
V. Chatsudthipong ◽  
Y. L. Chan
Keyword(s):  
Angiotensin Ii ◽  
Inhibitory Effect ◽  
Ang Ii ◽  
Inhibitory Effects ◽  
High Concentration ◽  
Extracellular Medium ◽  
Peritubular Capillaries ◽  
Tubular Transport ◽  
Proximal Tubular ◽  
High Concentrations

This study was designed to examine the intracellular mechanism of inhibitory action of high concentration of angiotensin II (ANG II) on proximal tubular transport in rat kidneys by microperfusion methods. Perfusion of ANG II (10(-6) M) to peritubular capillaries caused a reduction of both fluid and HCO3- transport (Jv and JHCO3-, respectively) by 33 and 26%, respectively. These inhibitory effects were blocked by the ANG II-receptor antagonist [Sar1, Ile8]ANG II (10(-5) M). Similar degrees of inhibition on Jv and JHCO3- were observed when ionomycin (10(-7) and 10(-6) M), a Ca2+ ionophore, was added to capillary perfusate. Moreover, there was no additive effect when both ANG II and ionomycin were perfused together through capillaries, suggesting that both agents work via the same mechanism, presumably by increasing cytosolic Ca2+ concentration ([Ca2+]i). Inhibitory effects of ANG II on proximal tubular transport were still observed in a Ca2(+)-free perfusate containing ethylene glycol-bis(beta-aminoethyl ether)-N,N,N',N'-tetraacetic acid, indicating that these effects do not require influx of Ca2+ from extracellular medium. Furthermore, the observation that TMB-8, an agent that prevents intracellular Ca2+ mobilization, completely eliminated the effect of ANG II strongly suggests that intracellular Ca2+ rather than Ca2+ influx mediates effects of ANG II on proximal tubular transport. Direct measurement of [Ca2+]i by use of fura-2 in isolated proximal tubular cells showed slight but statistically significant increases in [Ca2+]i. Taken together, these observations support the idea that intracellular Ca2+ serves as a second messenger in the inhibitory effect of high concentrations of ANG II on Jv and JHCO3- in proximal tubule of kidney.

scholarly journals Tucumã extracts decreases PML/RARΑ gene expression in NB4/APL cell line

2019 ◽  
Vol 1 (1) ◽  
pp. 77-98 ◽  
Author(s):  
Priscila Marquezan Copetti ◽  
Pablo Sebastian de Britto Oliveira ◽  
Luis Felipe Machado Garcia ◽  
Rodrigo Almeida Vaucher ◽  
Marta Medeiros Frescura Duarte ◽  
...  
Keyword(s):  
Gene Expression ◽  
Cell Line ◽  
Cytotoxic Effect ◽  
Genetic Material ◽  
Inhibitory Effect ◽  
Chromosome Translocation ◽  
High Concentration ◽  
Cytoprotective Activity ◽  
All Trans Retinoic Acid ◽  
High Concentrations

Acute promyelocytic leukemia (APL) is a cancer pharmacologically treated with all-trans retinoic acid (ATRA), although well tolerated by most patients, some develop toxicity to ATRA, Differentiation Syndrome. The Amazon Biome has several fruits and oil plants rich in micronutrients, particularly carotenoids as the fruit tucumã (Astrocaryum aculeatum). This study analyzed the antitumor and cytoprotective activity of tucumã with and without concomitant exposure of ATRA in high concentration mimicking the toxicity of differentiation syndrome, as the potential cytotoxic effect of chemotherapeutic in an APL cell line. The cultured NB4 cells were exposed to ethanolic extracts of tucumã and to synergism with extracts and ATRA. Determination of proliferation, cell viability, caspases 1, 3, 8 and cell differentiation by nested RT-qPCR. The ATRA control had a strong inhibitory effect and toxicity as expected. The extracts also reduced cell proliferation by triggering apoptosis in concentration-dependent and reversing chromosome translocation, especially the lowest tested concentration of tucumã pulp extract. In the synergism, extracts act to maintain the levels of viability and apoptosis equal to the ATRA control but in contrast to drug that causes death and destruction of the genetic material, tucumã demonstrated a reduction of the gene expression indicating a possible protection against the toxicity of high concentrations of ATRA. These results suggest that fruits rich in retinoid molecules may have a cytotoxic effect against APL cells and reduced concentrations of carotenoids may act as cytoprotectors in APL cells treated with high concentrations of ATRA promoting cellular/molecular differentiation.

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