![Factors Influencing the Interactions Among Photosynthesis, Translocation, and Nitrogen Fixation in Soybeans (G̲l̲y̲c̲i̲n̲e̲ M̲a̲x̲ [L.] Merr.) PDF](https://books.google.com/books/content/images/frontcover/JoZCPwAACAAJ?fife=w150-h200)
Author: Gary Alan FinnPublisher:
ISBN:
Category : Nitrogen
Languages : en
Pages : 126
Book Description
Factors Influencing the Interactions Among Photosynthesis, Translocation, and Nitrogen Fixation in Soybeans (G̲l̲y̲c̲i̲n̲e̲ M̲a̲x̲ [L.] Merr.)
![Factors Influencing the Interactions Among Photosynthesis, Translocation, and Nitrogen Fixation in Soybeans (G̲l̲y̲c̲i̲n̲e̲ M̲a̲x̲ [L.] Merr.) PDF](https://books.google.com/books/content/images/frontcover/JoZCPwAACAAJ?fife=w80-h100)
Author: Gary Alan FinnPublisher:
ISBN:
Category : Nitrogen
Languages : en
Pages : 126
Book Description
Factors Affecting Symbiotic Nitrogen Fixation in Soybeans [Glycine Max (L.) Merr.].
![Factors Affecting Symbiotic Nitrogen Fixation in Soybeans [Glycine Max (L.) Merr.]. PDF](https://books.google.com/books/content/images/frontcover/IpXuaddlqL4C?fife=w80-h100)
Author: R. J. LawnNitrogen Fixation in Soybeans (revision) 1979-1983
Author: Jayne T. MacLeanPublisher:
ISBN:
Category : Nitrogen
Languages : en
Pages : 44
Book Description
Soil Physical Conditions and Nitrogen Fixation of Soybeans (Glycine Max. Merrill, Var. Chippewa 64)
Author: Tsungmin KuoPublisher:
ISBN:
Category : Plant-soil relationships
Languages : en
Pages : 138
Book Description
The effect of soil water suction and soil temperature on rates of transpiration, photosynthesis, respiration and nitrogen fixation of soybean (Glycine max. Merrill, var. Chippewa 64) seedlings was studied. A special apparatus was developed in which the soil water suction of several cells with soybeans growing in them could be maintained independently at a selected temperature. Transpiration was determined by a constant-water level device which recorded the amount of water used over a period of time. Photosynthesis and respiration were measured using an infra-red gas analyzer. The total nitrogen content of plants was measured by the micro-Kjeldahl method at the beginning and end of a ten-day experimental period. Leaf surface areas were determined with an air flow planimeter. In general with increasing soil temperature rates of transpiration, photosynthesis, and nitrogen fixation increased slowly at first and then rapidly until a certain optimum range was reached and decreased at higher temperatures. Maximum rates occurred around soil temperatures, of 30, 27 and 27°C, respectively. The rate of respiration also increased with increasing soil temperature until an optimum range around 27°C was reached and then dropped rapidly as the soil temperature further increased. Rates of photosynthesis, respiration, transpiration and N-fixation decreased steadily with increasing soil water suction. The decrease in the rate of these metabolic processes with increased soil water suction was attributed to effects of changes in viscosity and root cell permeability, stomatal movement and translocation of metabolic substrates. At low soil temperatures the dry matter accumulation seemed to be controlled by the water supply. At higher than optimum soil temperatures the dry dry matter accumulation was very sensitive-to temperature changes and less soil water dependent. When the nitrogen supply from the soil is limiting, the nitrogen fixation may possibly be a most important factor in the metabolic processes and thus the growth of leguminous plants. It is obvious that for such a plant, soil water availability, soil temperature and nodule rhyzobium organism-plant relationships are important.
Assessment of the Rotational Influence and Nitrogen Contribution of Soybean [Glycine Max (L.) Merr.] to Subsequent Crops
![Assessment of the Rotational Influence and Nitrogen Contribution of Soybean [Glycine Max (L.) Merr.] to Subsequent Crops PDF](https://books.google.com/books/content/images/frontcover/mqmhAAAAMAAJ?fife=w80-h100)
Author: Timothy S. MaloneyNitrogen Fixation and Metabolism in Soybean Plants
Author: Takuji OhyamaPublisher: Nova Science Publishers
ISBN: 9781606928561
Category : Nitrogen
Languages : en
Pages : 131
Book Description
In the first part, the authors introduce the progress of researches on nitrogen metabolism of soybean nodules and roots. They investigate the fate of nitrogen fixed in soybean nodules by tracer experiment with 15N2 gas. The results indicate that major part of fixed N in bacteroids (a symbiotic state of rhizobia) is excreted rapidly to cytosol of infected cells in the form of ammonia, then the ammonia is assimilated into amino acids via GS/GOGAT pathway. Then the fixed nitrogen is assimilated into ureides, allantoin and allantoic acid, and then transported to the shoots via xylem. A small portion of fixed N was assimilated in the bacteroids directly into glutamate and alanine. On the other hand, nitrate absorbed from the roots are mainly assimilated into asparagine. The characteristics of nitrate absorption and metabolism was studied. It is well known that nitrate is a potent inhibitor to nodulation and nitrogen fixation, although the inhibitory mechanism is not fully understood. The authors recently found that nitrate depresses individual nodule growth and nitrogen fixation activity rapidly and reversibly when nodules were in direct contact with nitrate. The indirect effects of nitrate on nodule growth and nitrogen fixation activity were different among treatment concentration and period of supply. The continuous supply of low levels of nitrate from the lower part of roots promoted the nodulation and nitrogen fixation of the upper part of the roots. Hypernodulation mutant lines of soybean were isolated which have profuse nodulation compared with parents. They also exhibit partial-nitrate tolerant to nodulation. The characteristics of hypernodulation mutant lines were studied in relation to nitrate inhibition. The results suggest that lower nitrate absorption and assimilation activity in hypernodulation mutants may be one reason to milder inhibition by nitrate on hypernodulation mutant lines.
A study of the factors affecting photosynthesis respiration in soybean (Glycine max (L) Merr. cv. Kent)
Author: Michael James CoxTranslocation of Photosynthates in Soybeans (Glycine Max. (L) Merr. Cv. Wilkin) as Affected by Soil Water Potential and Soil Temperature
Author: Methi EkasinghPublisher:
ISBN:
Category : Plant translocation
Languages : en
Pages : 368
Book Description
Interactions of the Soybean Looper, Pseudoplusia Includens (Walker), and Soybean, Glycine Max (L.) Merrill, Involving Nitrogen
Author: Alan T. WierPublisher:
ISBN:
Category : Nitrogen
Languages : en
Pages : 216
Book Description
Author: Lisbet Ann Phillips