Leghemoglobin

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Leghemoglobin

 

a red iron-containing protein, similar in a number of properties to the hemoglobin of blood, that forms in the root nodules of actively nitrogen-fixing leguminous plants of the genus Leguminosae.

Leghemoglobin is a product of the symbiosis of two organisms: it consists of a heme synthesized by nodule bacteria and a globin formed by the cells of a higher plant. Leghemoglobin is destroyed when the nodules lose their capacity for symbiotic nitrogen fixation. Leghemoglobin was isolated in 1939 from the nodules of horse beans. It was obtained in crystalline form in 1959 from soy nodules. Like other hemoproteins, leghemoglobin regulates the oxygen regime in the nodule.

REFERENCES

Zhiznevskaia, G. Ia. Med’, molibden i zhelezo v azotnom obmene bobovykh rastenii Moscow, 1972.
Kretovich, V. L. Obmen azota v rasteniiakh. Moscow, 1972. [14–7264]
References in periodicals archive ?
According to the study, the maximum toxicity by pesticide pyriproxyfen was observed to nodule numbers in pea, root and shoot dry biomass, shoot nitrogen and root phosphorus in greengram, leghaemoglobin, seed protein and chlorophyll content in chickpea.
Dilworth, "Control of leghaemoglobin synthesis in snake beans," Biochemical Journal, vol.
Nodulation and nitrogen fixation depend on the capability of rhizobia for effective (nitrogen fixing) nodule formation, which was formed by synthesis of leghaemoglobin (Subba Rao, 2000) that increased nitrogenase activity for fixing higher amount of nitrogen.
A nodulated legume has an increased need for iron compared to a nonnodulated plant [99] since this metal is a constituent of key proteins such as nitrogenase and leghaemoglobin. Nitrogenase is made up of two proteins; both are rich in iron and essential for activity.
Nodules were removed, counted and sliced cross-sectionally for assessment for potential BNF using the leghaemoglobin pigment indicator Thereafter, each sample's nodules gravimetric moisture content and eventual dry nodule dry weight was determined.
N2 fixation (C2H2-reducing activity) and leghaemoglobin content during nitrate and water stress-induced senescence of Medicago sativa root nodules.
1987.5' Analysis of the soybean leghaemoglobin lbc3 gene: Regulatory elements required for promoter activity and organ specificity.
We know it is an effective siderophore and that it can make increased amounts of iron available from the soil to the rhizobia-plant symbiosis, which helps to make the heme protein in leghaemoglobin. This is one quarter of a human haemoglobin molecule and performs the same function.
Increase in the protease activity of nodules was paralleled by a decline in leghaemoglobin content beginning 31 DAE (Fig.
(1986), Abd-Alla (1992), and Abd-Alla and Abdel Wahab (1995a), studying the effect of water stress on leghaemoglobin metabolism, found that water stress lowered the content of leghaemoglobin and decreased respiration and ATP production.