Effect of host plant makeup through nitrogen fertilization and growth regulators on the pear psylla population

2010 ◽  
Vol 58 (2) ◽  
pp. 149-156 ◽  
Author(s):  
Liora Shaltiel-Harpaz ◽  
Rika Kedoshim ◽  
Dovik Openhiem ◽  
Raphael Stern ◽  
Moshe Coll
Keyword(s):  
Host Plant ◽  
Growth Regulators ◽  
Nitrogen Fertilization ◽  
Pear Psylla

Effects of elicitors of host plant defenses on pear psylla,Cacopsylla pyricola

2015 ◽  
Vol 157 (3) ◽  
pp. 300-306 ◽  
Author(s):  
W. Rodney Cooper ◽  
David R. Horton
Keyword(s):  
Host Plant ◽  
Plant Defenses ◽  
Pear Psylla

Anthracnose Severity on Annual Bluegrass Influenced by Nitrogen Fertilization, Growth Regulators, and Verticutting

Crop Science ◽  
2008 ◽  
Vol 48 (4) ◽  
pp. 1595-1607 ◽  
Author(s):  
John C. Inguagiato ◽  
James A. Murphy ◽  
Bruce B. Clarke
Keyword(s):  
Growth Regulators ◽  
Nitrogen Fertilization ◽  
Annual Bluegrass

scholarly journals Nitrogen Fertilization of the Host Plant Influences Production and Pathogenicity of Botrytis cinerea Secondary Inoculum

2013 ◽  
Vol 103 (3) ◽  
pp. 261-267 ◽  
Author(s):  
Manzoor Ali Abro ◽  
François Lecompte ◽  
Florian Bryone ◽  
Philippe C. Nicot
Keyword(s):  
Nutritional Status ◽  
Host Plant ◽  
Botrytis Cinerea ◽  
Disease Severity ◽  
Nitrogen Fertilization ◽  
N Fertilization ◽  
Optimum Level ◽  
Tomato Plants ◽  
N Nutrition ◽  
Very High

The influence of nitrogen (N) nutrition on a plant's susceptibility to Botrytis spp. and other pathogens is well documented. However, little is known of possible effects on sporulation of the pathogen on diseased tissue and on the pathogenicity of resulting secondary inoculum. To address this question, sporulation by two strains of Botrytis cinerea was quantified on tomato plants produced under different N irrigation regimes with inputs of NO3– at 0.5 to 45 mmol liter–1 (mM). Sporulation decreased significantly (P < 0.05) with increasing N fertilization up to NO3– at 15 to 30 mM. The secondary inoculum was collected and used to inoculate pruning wounds on tomato plants produced under a standard fertilization regime. Pathogenicity of the spores was significantly influenced by the nutritional status of their production substrate. Disease severity was highest with spores produced on plants with very low or very high N fertilization (NO3– at 0.5 or 30 mM). It was lowest for inoculum from plants with moderate levels of N fertilization. These results suggest that it may be possible to find an optimum level of N fertilization to reduce the production of secondary inoculum and its pathogenicity to tomato.

scholarly journals GROWTH AND YIELD OF THE COMMON BEAN IN RESPONSE TO COMBINED APPLICATION OF NITROGEN AND PACLOBUTRAZOL

2016 ◽  
Vol 29 (1) ◽  
pp. 127-132 ◽  
Author(s):  
OLIVIA MACHADO DE ALMEIDA ◽  
HYRANDIR CABRAL DE MELO ◽  
TOMÁS DE AQUINO PORTES
Keyword(s):  
Common Bean ◽  
Ammonium Sulfate ◽  
Growth Regulators ◽  
Nitrogen Fertilization ◽  
Grain Quality ◽  
Optimal Concentration ◽  
Growth And Yield ◽  
Combined Application ◽  
Bean Plants ◽  
The Common

ABSTRACT: Nitrogen fertilization is a common practice used to increase the yield of winter bean crops. However, this practice leads to excessively tall and prostrate plants that have too many leaves, resulting in self-shading, and low yield and grain quality. The use of growth regulators could minimize the undesired effects of nitrogen fertilization. This study aims to determine the optimal concentration of paclobutrazol (PBZ) for inhibiting bean growth using the cultivars BRS Pontal and BRS Supremo. The plants were treated with PBZ at different concentrations, and also in combination with ammonium sulfate ten days after fertilization. The height and yield of plants were evaluated. It was observed that PBZ at 8 mg L-1 effectively inhibits the growth of bean plants, and increases the number of pods and grains. Higher concentrations of PBZ proved to be phytotoxic. Additionally, the application of PBZ ten days after fertilization with ammonium sulfate did not suppress the overgrowth of bean plants, and did not affect their yield.

scholarly journals Effect of Long-Term Farming Practices on Agricultural Soil Microbiome Members Represented by Metagenomically Assembled Genomes (MAGs) and Their Predicted Plant-Beneficial Genes

Genes ◽  
2019 ◽  
Vol 10 (6) ◽  
pp. 424 ◽  
Author(s):  
Johanna Nelkner ◽  
Christian Henke ◽  
Timo Wentong Lin ◽  
Wiebke Pätzold ◽  
Julia Hassa ◽  
...  
Keyword(s):  
Plant Growth ◽  
Growth Regulators ◽  
Nitrogen Fertilization ◽  
Soil Samples ◽  
Soil Microbiome ◽  
Farming Practices ◽  
Metagenomic Dna ◽  
Reduced Nitrogen ◽  
Microbiome Profiling

To follow the hypothesis that agricultural management practices affect structure and function of the soil microbiome regarding soil health and plant-beneficial traits, high-throughput (HT) metagenome analyses were performed on Chernozem soil samples from a long-term field experiment designated LTE-1 carried out at Bernburg-Strenzfeld (Saxony-Anhalt, Germany). Metagenomic DNA was extracted from soil samples representing the following treatments: (i) plough tillage with standard nitrogen fertilization and use of fungicides and growth regulators, (ii) plough tillage with reduced nitrogen fertilization (50%), (iii) cultivator tillage with standard nitrogen fertilization and use of fungicides and growth regulators, and (iv) cultivator tillage with reduced nitrogen fertilization (50%). Bulk soil (BS), as well as root-affected soil (RS), were considered for all treatments in replicates. HT-sequencing of metagenomic DNA yielded approx. 100 Giga bases (Gb) of sequence information. Taxonomic profiling of soil communities revealed the presence of 70 phyla, whereby Proteobacteria, Actinobacteria, Bacteroidetes, Planctomycetes, Acidobacteria, Thaumarchaeota, Firmicutes, Verrucomicrobia and Chloroflexi feature abundances of more than 1%. Functional microbiome profiling uncovered, i.a., numerous potential plant-beneficial, plant-growth-promoting and biocontrol traits predicted to be involved in nutrient provision, phytohormone synthesis, antagonism against pathogens and signal molecule synthesis relevant in microbe–plant interaction. Neither taxonomic nor functional microbiome profiling based on single-read analyses revealed pronounced differences regarding the farming practices applied. Soil metagenome sequences were assembled and taxonomically binned. The ten most reliable and abundant Metagenomically Assembled Genomes (MAGs) were taxonomically classified and metabolically reconstructed. Importance of the phylum Thaumarchaeota for the analyzed microbiome is corroborated by the fact that the four corresponding MAGs were predicted to oxidize ammonia (nitrification), thus contributing to the cycling of nitrogen, and in addition are most probably able to fix carbon dioxide. Moreover, Thaumarchaeota and several bacterial MAGs also possess genes with predicted functions in plant–growth–promotion. Abundances of certain MAGs (species resolution level) responded to the tillage practice, whereas the factors compartment (BS vs. RS) and nitrogen fertilization only marginally shaped MAG abundance profiles. Hence, soil management regimes promoting plant-beneficial microbiome members are very likely advantageous for the respective agrosystem, its health and carbon sequestration and accordingly may enhance plant productivity. Since Chernozem soils are highly fertile, corresponding microbiome data represent a valuable reference resource for agronomy in general.

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