Nodule structure and functioning in Cicer arietinum as affected by nitrate

Sheokand, Sunita; Babber, S.; Swaraj, K.

doi:10.1023/a:1001810813047

Cited by 4 publications

(2 citation statements)

References 31 publications

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“…中是否具有两种新生成的蛋白, 即豆血红蛋白和固氮酶 [10,16] 。豆血红蛋白维持豆科植物根瘤内较低浓度但高流量的氧气, 并有效地把 O 2 传递给类菌体的含铁血红蛋白, 其浓度越高, 根瘤的固氮酶活性越强 [17][18][19] , 固氮能力将相应增强。短期改变生长介质中磷水平时, 磷对大豆根瘤共生固氮的影响表现为间接影响大豆的生长, 直接影响根瘤的代谢功能 [6] 。本试验在根瘤形成后调整营养液中磷酸盐浓度, 充足的磷素供应较缺磷处理提高了根瘤的固氮…”

Section: 在发育过程中能否形成有效根瘤取决于根瘤unclassified

Effects of Phosphorus Deficiency on Growth and Nitrogen Fixation of Soybean after Nodule Formation

Yun-fa¹,

Han²,

Wang³

et al. 2009

A A S

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Phosphorus had a key role in soybean growth, however, it is very different to separate the role in soybean growth from that in nodule function. The research was conducted to elucidate the effects of phosphorus deficiency on growth and nitrogen fixation after nodule formation in soybean. Soybean seedlings were cultivated in nutrient solution culture with normal phosphorus concentration (30 µmol L −1 ), which was shifted to 0 and 4 µmol L −1 after nodule formation resulting in phosphorus deficience for soybean plants. The results showed that phosphorus deficiency negatively influenced soybean plant growth at the ninth day of phosphorus deficiency treatment and nitrogen fixation at the beginning of the treatment. The nodule number increased by 11.8%, 15.4%, and 20.0%, respectively in 0, 4, and 30 µmol L −1 phosphorus treatments at the ninth day of treatment compared with that at the third day. Leghemoglobin concentration per gram of plant and per nodule biomass increased with phosphorus concentration increase. These suggested that phosphorus deficiency affected significantly nodule development and nitrogen fixation when soybean plants formed sufficient nodule.

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Section: 在发育过程中能否形成有效根瘤取决于根瘤unclassified

Effects of Phosphorus Deficiency on Growth and Nitrogen Fixation of Soybean after Nodule Formation

Yun-fa¹,

Han²,

Wang³

et al. 2009

A A S

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“…Supplying soybean roots with 5 mM nitrate under hydroponic conditions inhibited the expansion of infected cells in nodules ( Fujikake et al., 2003b ). When 50 mM nitrate was supplied to chickpea ( Cicer arietinum L.) roots under sand culture conditions, infected cell nuclei disappeared, the bacteroids became sparse, and the nodule nitrogenase activity decreased ( Sheokand et al., 1998 ). In studies of barrel medic ( Medicago truncatula ), trifolium ( Trifolium subterraneum L.), lupin ( Lupinus albus L. cv.…”

Section: Introductionmentioning

confidence: 99%

Systemic regulation of nodule structure and assimilated carbon distribution by nitrate in soybean

Wu²,

Líu³

et al. 2023

Front. Plant Sci.

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BackgroundThe nitrate regulates soybean nodulation and nitrogen fixation systemically, mainly in inhibiting nodule growth and reducing nodule nitrogenase activity, but the reason for its inhibition is still inconclusive.MethodsThe systemic effect of nitrate on nodule structure, function, and carbon distribution in soybean (Glycine max (L.) Merr.) was studied in a dual-root growth system, with both sides inoculated with rhizobia and only one side subjected to nitrate treatment for four days. The non-nodulating side was genetically devoid of the ability to form nodules. Nutrient solutions with nitrogen concentrations of 0, 100, and 200 mg L-1 were applied as KNO3 to the non-nodulating side, while the nodulating side received a nitrogen-free nutrient solution. Carbon partitioning in roots and nodules was monitored using 13C-labelled CO2. Other nodule responses were measured via the estimation of the nitrogenase activity and the microscopic observation of nodule ultrastructure.ResultsElevated concentrations of nitrate applied on the non-nodulating side caused a decrease in the number of bacteroids, fusion of symbiosomes, enlargement of the peribacteroid spaces, and onset of degradation of poly-β-hydroxybutyrate granules, which is a form of carbon storage in bacteroids. These microscopic observations were associated with a strong decrease in the nitrogenase activity of nodules. Furthermore, our data demonstrate that the assimilated carbon is more likely to be allocated to the non-nodulating roots, as follows from the competition for carbon between the symbiotic and non-symbiotic sides of the dual-root system.ConclusionWe propose that there is no carbon competition between roots and nodules when they are indirectly supplied with nitrate, and that the reduction of carbon fluxes to nodules and roots on the nodulating side is the mechanism by which the plant systemically suppresses nodulation under nitrogen-replete conditions.

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Management of Phosphorus and Nitrogen Fertilization to OptimizeAnthyllis–Glomus–RhizobiumSymbiosis for Revegetation of Desertified Semiarid Areas

Goicoechea

Merino

Sánchez‐Díaz

2005

Journal of Plant Nutrition

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Nodule structure and functioning in Cicer arietinum as affected by nitrate

Cited by 4 publications

References 31 publications

Effects of Phosphorus Deficiency on Growth and Nitrogen Fixation of Soybean after Nodule Formation

Effects of Phosphorus Deficiency on Growth and Nitrogen Fixation of Soybean after Nodule Formation

Systemic regulation of nodule structure and assimilated carbon distribution by nitrate in soybean

Management of Phosphorus and Nitrogen Fertilization to OptimizeAnthyllis–Glomus–RhizobiumSymbiosis for Revegetation of Desertified Semiarid Areas

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