Influence of Nitrogen Sources and Plant Growth-Promoting Rhizobacteria Inoculation on Growth, Crude Fiber and Nutrient Uptake in Squash (&lt;i&gt;Cucurbita moschata&lt;/i&gt; Duchesne ex Poir.) Plants

TCHIAZE, Alice I.; Taffouo, Victor Désiré; Fankem, Henri; Kenné, Martin; Baziramakenga, Régis; Ekodeck, Georges Emmanuel; Antoun, Hani

doi:10.15835/nbha44110169

Cited by 8 publications

(4 citation statements)

References 43 publications

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“…Regarding N concentration, several studies have found that PGPR can increase the N levels in tomato and zucchini shoots [10,63,64]. However, in the present study, PGPR application did not increase the N levels in plant shoots in both experiments.…”

Section: Discussioncontrasting

confidence: 90%

Growth and Nutritional Responses of Zucchini Squash to a Novel Consortium of Six Bacillus sp. Strains Used as a Biostimulant

Savvas,

Magkana,

Yfantopoulos

et al. 2024

Agronomy

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The use of biostimulants consisting of plant growth-promoting rhizobacteria (PGPR) has been rapidly expanding in horticulture in recent years. In the current study, a novel mix of six Bacillus sp. strains (B. subtilis, B. pumilus, B. megaterium, B. amyloliquefaciens, B. velezensis, B. licheniformis) was tested as a PGPR biostimulant in two experiments with zucchini squash (Cucurbita pepo L.). The first experiment took place in greenhouse soil in winter, while the second experiment was conducted in an open field during summer. In both experiments, seeds of the local landrace “Kompokolokytho” and the commercial hybrid “ARO-800” were either inoculated or non-inoculated with the PGPR biostimulant. The application of the six Bacillus sp. strains increased both the vegetative growth and the yield of zucchini squash, and these effects were associated with significantly higher shoot phosphorus levels in both experiments and both genotypes. Furthermore, at the end of the cultivation, the colony-forming units of Bacillus sp. were appreciably higher in plants originating from inoculated compared to non-inoculated seeds, indicating that the tested mix of Bacillus sp. can be successfully applied through seed inoculation. “ARO-800” produced more vegetative and fruit biomass than “Κompokolokytho” under greenhouse cropping conditions, while in the open field crop, both genotypes performed equally. Presumably, this response occurred because “ARO-800” did not express its full yield potential in the open field due to stress imposed by the high summer temperatures, while the local landrace, which is traditionally grown in open fields, may be more resilient to stress conditions frequently encountered in open fields.

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Section: Discussioncontrasting

confidence: 90%

Growth and Nutritional Responses of Zucchini Squash to a Novel Consortium of Six Bacillus sp. Strains Used as a Biostimulant

Savvas,

Magkana,

Yfantopoulos

et al. 2024

Agronomy

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“…A high level of Ca was found to exist in the humus layer of contaminated soils where root ramification was impaired [64]. When soil environment was improved to benefit foraging by ramifying root crossings, Ca uptake did not accord [65]. Instead, root foraging sensitivity was lowered by the high Ca level in P. asiatica, which was driven by fine root tip number.…”

Section: Root Foraging Behavior and Driving Forces From Fine Root Mor...mentioning

confidence: 99%

Root Foraging Behavior of Two Agronomical Herbs Subjected to Heterogeneous P Pattern and High Ca Stress

et al. 2022

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Ecosystems are vulnerable to large areas of rocky desertification, which results in patchy soils and stone-inlaid soils. Karst landforms are typically characterized by heterogeneous phosphorus (P) distributions in soils at high calcium (Ca), but root foraging behavior has not been fully documented in agronomical plants. In this study, Bidens pilosa L. and Plantago asiatica L. were raised in pots in a simulated soil environment with sands at high Ca (2 g kg−1) and low Ca (0.63 g kg−1) levels. Inner spaces were divided into four sections to receive P in homogeneous (Homo.) (four quarters: 2 mg P kg−1) or heterogenous (Hete.) (one quarter: 8 mg P kg−1; three quarters: no-P input) patterns. Both species had longer roots in high P sections compared to no P sections. Foraging scale (highest length or surface-area(SA)) was higher in P. asiatica plants subjected to the Hete. pattern than to the Homo. pattern in low Ca pots. Foraging precision (length or SA differences between P patches as a proportion of the total) was also higher for P. asiatica subjected to the Hete. pattern but did not change in response to Ca level or P placement pattern. Overall, P. asiatica has a higher foraging ability than B. pilosa because of higher levels of foraging scale and precision from high-P (8 mg kg−1) patches in soils subjected to low Ca (0.63 g kg−1).

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“…Nitrogen is not only an essential nutrient element for plant growth and development but also a limiting element for plant growth [38,39]. Nitrogen in soil mainly exists in two forms: organic nitrogen and inorganic nitrogen.…”

Section: Response Of Nitrogen Transformation In Paddy Soil To Azolla ...mentioning

confidence: 99%

Effects of UV-B Radiation on the Chemical Composition of Azolla and Its Decomposition after Returning to the Field and Nitrogen Transformation in Soil

Chang

Liu

et al. 2023

Agronomy

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In the present research, the effects of UV-B radiation (5.00 kJ·m−2) on the chemical composition of Azolla were investigated, and the decomposition of Azolla residues after UV-B radiation, the nitrogen form, enzyme activity, and bacterial community in paddy soil were analyzed. Compared to the natural light treatment, the total nitrogen content of Azolla was significantly increased by 17.0% under UV-B radiation treatment. Compared to returned Azolla grown under natural light, the decomposition rate of cellulose, lignin, and total nitrogen of returned Azolla grown under UV-B radiation significantly increased, which led to an increase in the activities of nitrogen transformation enzymes, including neutral protease, ammonia monooxygenase, nitrogenase, nitrate reductase, and nitrite reductase, and the contents of different nitrogen forms (NH4+-N, NO3−-N, soluble organic nitrogen, and microbial biomass nitrogen) in paddy soil, while N2O emission flux was significantly reduced by 20–30%. The dominant bacteria in soil supplied with Azolla grown under natural light were Firmicutes, Clostridia, Clostridiales, and Lachnospiraceae. However, returning Azolla grown under UV-B radiation to the soil significantly changed the bacterial community structure in soil, resulting in a decrease in the number of ammonifying bacteria, nitrifying bacteria, and nitrogen-fixing bacteria and an increase in the number of denitrifying bacteria, inducing changes in the dominant bacteria to Methanomicrobiales, Methanoregulaceae, and Methanoregula. According to the structural equation model, returning Azolla to the field would reduce N2O emissions by increasing Azolla lignin decomposition and ammonia monooxygenase activity, reducing the number of nitrifying bacteria and reducing nitrite reductase activity in soil. Thus, UV-B radiation can directly change the phytochemical components and their decomposition in soil, thus indirectly affecting the bacterial community structure, enzyme activity, and nitrogen transformation, which play important ecological roles in regulating the nutrient transformation of terrestrial ecosystems.

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Influence of Nitrogen Sources and Plant Growth-Promoting Rhizobacteria Inoculation on Growth, Crude Fiber and Nutrient Uptake in Squash (<i>Cucurbita moschata</i> Duchesne ex Poir.) Plants

Cited by 8 publications

References 43 publications

Growth and Nutritional Responses of Zucchini Squash to a Novel Consortium of Six Bacillus sp. Strains Used as a Biostimulant

Growth and Nutritional Responses of Zucchini Squash to a Novel Consortium of Six Bacillus sp. Strains Used as a Biostimulant

Root Foraging Behavior of Two Agronomical Herbs Subjected to Heterogeneous P Pattern and High Ca Stress

Effects of UV-B Radiation on the Chemical Composition of Azolla and Its Decomposition after Returning to the Field and Nitrogen Transformation in Soil

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