Influence of soil texture and cultivation on carbon and nitrogen levels in soils of the eastern Indo-Gangetic Plains

Geoderma ◽  
2009 ◽  
Vol 153 (3-4) ◽  
pp. 304-311 ◽  
Author(s):  
Sanjay K. Gami ◽  
Julie G. Lauren ◽  
John M. Duxbury
Keyword(s):  
Soil Texture ◽  
Gangetic Plains ◽  
Carbon And Nitrogen ◽  
Nitrogen Levels

scholarly journals Preliminary Study of the Influence of Conductivity and Calcium Concentrations on the Density and Species Richness of Native and Invasive Gastropods in Grand Teton National Park, Wyoming

2013 ◽  
Vol 36 ◽  
pp. 46-49
Author(s):  
Michele Larson ◽  
Gary Beauvais
Keyword(s):  
Invasive Species ◽  
Native Species ◽  
Native Community ◽  
Ecological Processes ◽  
Freshwater Gastropods ◽  
Carbon And Nitrogen ◽  
Nitrogen Levels ◽  
Freshwater Habitats ◽  
Primary Producer ◽  
Preliminary Study

Freshwater gastropods are a diverse taxa that inhabit a wide variety of freshwater habitats (Lydeard et al. 2004, Strong et al. 2008). Freshwater gastropods often form narrow endemic ranges (Strong et al. 2008) with many species restricted to a single drainage or an isolated spring (Brown et al. 2008). In North America, over 60% of freshwater snails are listed as imperiled or presumed extinct (Lysne et al. 2008). The main factors for the reduction in snail biodiversity are habitat loss, water pollution, and the introduction of invasive species (Strong et al. 2008). Invasive species can dramatically alter the native community by reducing biodiversity and changing ecological processes (Alonso and Castro-Diez 2008). The effects of invasive species on aquatic ecosystems are often permanent and lead to reductions in biodiversity due to predation and competition with native species (Alonso and Castro-Diez 2008, Lysne et al. 2008, Strayer 1999). Invasive gastropods impact native ecosystems by altering carbon and nitrogen levels (Hall et al. 2003, Arango et al. 2009), consuming large amounts of primary producer biomass (Hall et al. 2003, Riley et al. 2008, Strayer 2010), and changing native macroinvertebrate community composition (Kerans et al. 2005, Riley et al. 2008, Cross et al. 2010, Brenneis et al. 2011).

Regulation of three genes encoding cell-wall-degrading enzymes of Trichoderma aggressivum during interaction with Agaricus bisporus

2013 ◽  
Vol 59 (6) ◽  
pp. 417-424 ◽  
Author(s):  
Kamal S. Abubaker ◽  
Calvin Sjaarda ◽  
Alan J. Castle
Keyword(s):  
Cell Wall ◽  
Agaricus Bisporus ◽  
Mixed Cultures ◽  
Cell Wall Degrading Enzymes ◽  
Carbon And Nitrogen ◽  
Nitrogen Levels ◽  
Degrading Enzymes ◽  
Genes Encoding ◽  
Green Mould ◽  
Catabolite Regulation

Members of the genus Trichoderma are very effective competitors of a variety of fungi. Cell-wall-degrading enzymes, including proteinases, glucanases, and chitinases, are commonly secreted as part of the competitive process. Trichoderma aggressivum is the causative agent of green mould disease of the button mushroom, Agaricus bisporus. The structures of 3 T. aggressivum genes, prb1 encoding a proteinase, ech42 encoding an endochitinase, and a β-glucanase gene, were determined. Promoter elements in the prb1 and ech42 genes suggested that transcription is regulated by carbon and nitrogen levels and by stress. Both genes had mycoparasitism-related elements indicating potential roles for the protein products in competition. The promoter of the β-glucanase gene contained CreA and AreA binding sites indicative of catabolite regulation but contained no mycoparasitism elements. Transcription of the 3 genes was measured in mixed cultures of T. aggressivum and A. bisporus. Two A. bisporus strains, U1, which is sensitive to green mould disease, and SB65, which shows some resistance, were used in co-cultivation tests to assess possible roles of the genes in disease production and severity. prb1 and ech42 were coordinately upregulated after 5 days, whereas β-glucanase transcription was upregulated from day 0 with both Agaricus strains. Upregulation was much less pronounced in mixed cultures of T. aggressivum with the resistant strain, SB65, than with the sensitive strain, U1. These observations suggested that the proteins encoded by these genes have roles in both nutrition and in severity of green mould disease.

scholarly journals Land Use Systems, Soil Texture, Control Carbon and Nitrogen Storages in the Forest Soil of UB Forest, Indonesia

2019 ◽  
Vol 41 (3) ◽  
Author(s):  
Syahrul Kurniawan ◽  
Sri Rahayu Utami ◽  
Miftakhul Mukharomah ◽  
Ian A. Navarette ◽  
Budi Prasetya
Keyword(s):  
Land Use ◽  
Forest Soil ◽  
Soil Texture ◽  
Carbon And Nitrogen ◽  
Land Use Systems

Carbon and Nitrogen Levels in a Subsurface Drained Silty Clay Soil

1989 ◽  
Vol 32 (2) ◽  
pp. 0559-0563 ◽  
Author(s):  
G. R. Benoit ◽  
W. J. Grant ◽  
J. Bornstein ◽  
P. Hepler
Keyword(s):  
Clay Soil ◽  
Silty Clay ◽  
Carbon And Nitrogen ◽  
Nitrogen Levels ◽  
Silty Clay Soil

scholarly journals Physiological Evaluations of Maize Hybrids under Low Nitrogen

2019 ◽  
Vol 2019 ◽  
pp. 1-6 ◽  
Author(s):  
A. W. Abubakar ◽  
A. A. Manga ◽  
A. Y. Kamara ◽  
A. I. Tofa
Keyword(s):  
Growth Indices ◽  
Maize Hybrids ◽  
Carbon And Nitrogen ◽  
Nitrogen Levels ◽  
Drought Tolerant ◽  
Main Plot ◽  
Natural Carbon ◽  
Physiological Reactions ◽  
Low Nitrogen ◽  
Plot Design

A field experiment was conducted during 2014 and 2016 rainy season at Tudun Wada, Kano and Shika, Zaria in the Northern Guinea Savanna of Nigeria in order to study the physiological responses of maize hybrids under low nitrogen. The experiment consisted of two nitrogen levels 0 and 120 N kg ha−1 as main plot and 8 drought-tolerant maize hybrids and 2 controls as subplot laid out in a randomized split plot design and replicated three times. Physiological parameters of hybrids were significantly affected by low nitrogen at both locations. Interaction between hybrids and nitrogen was significantly affected at both locations. Based on these results, application of nitrogen significantly increased the physiological growth indices of maize hybrids. The extent of increment in physiological reactions was additionally higher in Zaria in view of higher soil natural carbon and nitrogen and higher precipitation was better dispersed at this area. However recent hybrids were more tolerant to nitrogen stress and out-yielded the older hybrids. Therefore the recently released hybrids were more adapted to abiotic stresses.

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