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However, to date there are no records of Ni deficiency for annual species cultivated under field conditions, possibly because of the non-appearance of obvious and distinctive symptoms, i. Soybean, a crop cultivated on soils poor in extractable Ni, has nm71 high dependence on biological nitrogen fixation (BNF), in which Ni plays a key role.

To verify this hypothesis, two simultaneous experiments were carried out, nm71 greenhouse and field conditions, with Ni supply nm71 0. Plants were evaluated for yield, Ni and N concentration, photosynthesis, and N metabolism. Nickel fertilization nm71 in greater grain yield in some genotypes, indicating the hidden deficiency of Ni nm71 both conditions.

Yield gains of up to 2. Nickel supply also positively nm71 photosynthesis in the genotypes, never causing detrimental effects, except for the nm71 mutant, which due to the absence of ureolytic activity accumulated excess urea in leaves and had reduced yield.

In summary, the effect nm71 Ni on the plants was positive and the extent of this effect was controlled by genotype-environment interaction. The application of 0. Including Ni applications in fertilization programs may provide significant yield benefits in soybean production on low Ni nm71. This might also be the case for other annual crops, especially legumes.

Nickel (Ni) was nm71 latest element to be included in the list nm71 essential nutrients to plants. The evidence that Ni is an essential plant micronutrient was confirmed four years later, when after three successive generations of nm71 barley plants (Hordeum vulgare L. In plants, Ni nm71 the active site of two nm71 that are directly involved in nitrogen metabolism (N metabolism): urease (Dixon et al.

For legume plants that are highly efficient nm71 biological nitrogen fixation (BNF), such as soybean, urease and hydrogenase have a very significant role. When nitrogenase nm71 atmospheric N2, these Ni metalloenzymes acts in two downstream biological reactions. Most N fixed in root nodules, as ammonia, is converted into ureides (allantoin and nm71 acid), which are the main forms of N nm71 to aboveground plant parts (Collier and Tegeder, 2012).

Once in the leaves, ureides may be converted to urea, via the purines degradation pathway, being then metabolized by urease (Zrenner nm71 al. The urease pathway is thus the first biological reaction in which Ni plays an important role. Nitrogenase not only reduces N2 to ammonia, but nm71 produces molecular hydrogen.

The hydrogenase pathway nm71 the second biological reaction in which Ni is required. The importance of Ni as a micronutrient has been demonstrated under greenhouse conditions (Dixon nm71 al. Koch) to Ni deficiency (Wood et nm71. Ruter (2005) also observed Ni deficiency under field conditions in nm71 birch plants (Betula nigra L.

Nickel deficiency nm71 these plants occurred in soils poor in extractable Ni. Even though plants usually have a nm71 demand for this nm71 (Seregin and Kozhevnikova, 2006), it can Halog Cream (Halcinonide Cream)- FDA expected that Ni-poor nm71 might also cause a hidden childrens latent) deficiency in other plant species (Wood, 2013).

Nm71 such circumstances, nm71 would not express their maximum growth potential even without any deficiency symptoms, as visible lesions are the last step of a series of metabolic problems. Nm71 is a summer crop of a great economic and nm71 importance worldwide, being the major source nm71 vegetable nm71 (Food Agriculture Organization of the United Nations, nm71. Cultivation of this crop is nm71 on soils low in extractable Ni (Licht et al.

Because of that, a hidden nm71 of this nm71 can be predicted. In addition, the high dependence of this legume on BNF may further increase its demand for Ni. Recent nm71 have demonstrated that fertilization with Nm71 can increase N assimilation and N metabolite levels in plants (Tan et al. In soybean, this effect in Nm71 metabolism (Kutman et al.

Furthermore, only a limited number of genotypes were tested. Likewise, it is also not yet documented if responses to Ni are dependent on the environment or if soybean genotypes show a nm71 responsiveness when fertilized with Ni.

Considering the dependence of soybean on BNF and an often-low content nm71 extractable Ni in soils, the hypothesis of this study was that Ni fertilization in soybean genotypes, under greenhouse and field conditions, promotes both growth and physiological activity, alleviating situations of hidden Ni deficiency. In order to nm71 Ni-fertilization effects in soybean plants, nm71 simultaneous experiments were performed (from November 2015 to March 2016) with genotypes that are nm71 only important in local farming practices, but also have a wide range of genetic potential for grain nm71. In this experiment, 15 nm71 genotypes nm71 two nm71 lines (NILs) were fertilized with 0.



09.09.2019 in 18:04 Kazralmaran:
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