scholarly journals Influence of Interactions between Nitrogen, Phosphorus Supply and Epichloёbromicola on Growth of Wild Barley (Hordeum brevisubulatum)

2021 ◽  
Vol 7 (8) ◽  
pp. 615
Author(s):  
Mingxiao Lang ◽  
Jingle Zhou ◽  
Taixiang Chen ◽  
Zhenjiang Chen ◽  
Kamran Malik ◽  
...  
Keyword(s):  
Wild Barley ◽  
Nutrient Deficiency ◽  
Microbial Infection ◽  
Nutrient Stoichiometry ◽  
Host Growth ◽  
Biotrophic Fungi ◽  
Growth Promoting ◽  
Epichloë Endophytes ◽  
Nitrogen Phosphorus ◽  
Hordeum Brevisubulatum

Epichloë endophytes are biotrophic fungi that establish mutualistic symbiotic relationship with grasses and affect performance of the host under different environments. Wild barley (Hordeum brevisubulatum) is an important forage grass and often infected by Epichloë bromicola, thus showing tolerances to stresses. Since the plant growth correlates with both microbial infection and nutrient stoichiometry, this study was performed to investigate whether the function of Epichloë bromicola endophyte to improve host growth depend upon the nitrogen (N), phosphorus (P) fertilization. Epichloë-infected (E+) and Epichloë-free (E−) wild barley plants were subjected to nine types of mixed N (0.2 mM, 3 mM, 15 mM) and P (0.01 mM, 0.1 mM, 1.5 mM) levels treatments for 90 d to collect plant samples and determine multiple related indexes. We found that E. bromicola and N, P additions positively affected seed germination. Further, E. bromicola significantly enhanced chlorophyll content and root metabolic activity under N-deficiency, and meanwhile, might alter allocation of photosynthate under different conditions. The contents of N, P and stoichiometry of C:N:P of E+ plants were significantly higher than that of E− under nutrient deficiency, but contrary results were observed under adequate nutrients. Therefore, we propose that the growth-promoting ability of E. bromicola is closely correlated with N and P additional levels. Under low N, P additions, positive roles of endophyte are significant as opposed to negative roles under high N, P additions.

An asexual Epichloë endophyte modifies the nutrient stoichiometry of wild barley (Hordeum brevisubulatum) under salt stress

2014 ◽  
Vol 387 (1-2) ◽  
pp. 153-165 ◽  
Author(s):  
Meiling Song ◽  
Qing Chai ◽  
Xiuzhang Li ◽  
Xiang Yao ◽  
Chunjie Li ◽  
...  
Keyword(s):  
Salt Stress ◽  
Wild Barley ◽  
Nutrient Stoichiometry ◽  
Hordeum Brevisubulatum ◽  
Epichloë Endophyte

scholarly journals PENGARUH PENAMBAHAN PGPR (Plant Growth Promoting Rhizobacteria) dan BUAH NANAS(Ananas comosus) TERHADAP SPESIFIKASI PUPUK ORGANIK CAIR RUMPUT LAUT Euchema cottonii (Effect of Adding PGPR (Plant Growth Promoting Rhizobacteria) and Pineapple (Ananas comosus) for Specifications of Organic Liquid Fertilizer Euchema cottonii)

2017 ◽  
Vol 12 (2) ◽  
pp. 139
Author(s):  
Indriyanti Indriyanti ◽  
Eko Nurcahya Dewi ◽  
Eko Susanto
Keyword(s):  
Plant Growth ◽  
Organic Nitrogen ◽  
Organic Liquid ◽  
Organic Fertilizer ◽  
Plant Growth Promoting Rhizobacteria ◽  
Ananas Comosus ◽  
Nitrogen Levels ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Nitrogen Phosphorus

ABSTRAK Euchema cottonii mengandung unsur mikro dan makro nutrien, serta zat pengatur tumbuh tanaman seperti auksin, giberelin, sitokinin, dan etilen sehingga sangat berpotensi sebagai pupuk organik penyubur tanaman. Penambahan buah nanas berfungsi sebagai sumber C, P, dan K pada ekstrak pupuk rumput laut cair. Penelitian ini bertujuan untuk mengetahui pengaruh penambahan bioaktivator PGPR (Plant Growth Promoting Rhizobacteria)dan buah nanas terhadap kandungan C-organik, nitrogen, fosfor, kalium, pH, suhu, bakteri patogen, dan organoleptik warna. Material yang digunakan dalam penelitian ini adalah E. cottonii, PGPR, dan buah nanas.. Rancangan percobaan yang digunakan adalah Rancangan Acak Lengkap (RAL) dengan 4 perlakuan dan 3 ulangan yaitu perlakuan kontrol (A), penambahan PGPR dan  buah nanas 40% (B), penambahan PGPR dan buah nanas 50% (C), dan penambahan PGPR dan  buah nanas 60% (C). Parameter yang diukur adalah C-organik, nitrogen, fosfor, kalium, pH, suhu, bakteri pathogen, dan oraganoleptik warna. Data parametrik dianalisa dengan uji ANOVA. Hasil penelitian menunjukkan bahwa penambahan buah nanas yang berbeda memberikan pengaruh nyata terhadap kadar C-organik, fosfor, dan kalium (p<0,05), sedangkan nilai nitrogen tidak berbeda nyata. Perlakuan penambahan nanas 50% akan meningkatkan kandungan nitrogen dua kali lebih besar dari pada kontrol. Perlakuan terbaik yaitu pada penambahan PGPR dan nanas 60% dengan kandungan C, P, K berturut-turut adalah 7,02%, 3,44%, dan 3,41%. Kata kunci: Euchema cottonii, Pupuk Oganik Cair, PGPR,  Nanas ABSTRACT Euchema cottoniicontains elements ofmicroandmacronutrients, andplantgrowth regulatorssuch asauxin, gibberellin, cytokinin, andethyleneso ithasgreat potentialas anorganicfertilizer forfertilisingcrops. Addition A. comosusserves asa source of C, P, and Kin theliquid organic fertilizer. This study aimedtodetermine the effect ofbio-activatorPGPRandA. comosus on the content ofC-organic, nitrogen, phosphorus, potassium, pH, temperature, pathogens, and color. The materialusedin this studywereE.cottonii, PGPR, andA. comosus.This research wasexperimentallaboratoriesusing completely randomized designwith 4 differenttreatments and 3replications, namely control (A), addition ofPGPR and A. comosus 40%(B), addition of PGPR  and A. comosus 50% (C), and addition of PGPR and A. comosus 60% (D). Parametersmeasured wereC-organic, nitrogen, phosphorus, potassium, pH, temperature, pathogens, and color organoleptic. Parametric datawere analyzed byANOVA. The results showedthat theaddition ofPGPRandA.comosussignificantly affect(P<0.05) to thelevels ofc-organic, phosphoruslevels, potassium levels, but not nitrogen levels. Addition of pineapple 50% will increase the nitrogen content twice higher than control. The best treatment is addition of PGPR and pineapple 60% with the content of C, P, K respectively 7.02%, 3.44% and 3.41%. Keywords: Euchema cottoni, Liquid Organic Fertilizer, PGPR, Ananas comosus

scholarly journals High Sucrose Levels and Abnormal Enzyme Activity as a Function of Nutritional Stress in Sugarcane

1969 ◽  
Vol 51 (4) ◽  
pp. 325-333
Author(s):  
Alex G. Alexander
Keyword(s):  
Nutrient Deficiency ◽  
Critical Factor ◽  
Nutritional Stress ◽  
Nutrient Supply ◽  
Oxidative Enzymes ◽  
Sand Culture ◽  
High Level ◽  
To Receive ◽  
High Sucrose ◽  
Nitrogen Phosphorus

Deficiencies of nitrogen, phosphorus, potassium, and calcium were gradually induced in sugarcane grown by sand culture. There were three objectives: 1, To determine whether nutritional stress in general is a means of inducing higher sucrose production; 2, to determine whether sucrose increases can be triggered without reaching nutrient-deficiency levels which would reduce tonnage; and 3, to ascertain whether increased sucrose production can be traced to common behavior patterns of hydrolytic and oxidative enzymes. All plants received a moderately high level of all nutrients until 14 weeks of age. Thereafter, individual nutrients were gradually lowered at intervals of 2 weeks, while control plants continued to receive the original levels. All plants subjected to nutritional stress accumulated higher leaf sucrose than control plants, regardless of the nutrient withheld. In each instance sucrose increases were recorded before nutrient supply had reached deficiency proportions. General nutritional stress thus appears to trigger variations in sugar level, with nutritional imbalance rather than actual deficiency being a critical factor. All plants under nutritional stress revealed a concurrent suppression of amylase as sucrose increased. Peroxidase was greatly stimulated by all nutritional treatments. Phosphatase was suppressed by decreasing nitrate and phosphorus, but was generally unaffected by the potassium and calcium treatments. Several distinct mechanisms of increased sucrose formation are indicated by the enzyme data. Sensitivity of amylase to changing nutrient supply is discussed from the standpoint of a possible indicator of approaching deficiency.

Genetic and epigenetic instabilities induced by tissue culture in wild barley (Hordeum brevisubulatum (Trin.) Link)

2007 ◽  
Vol 90 (2) ◽  
pp. 153-168 ◽  
Author(s):  
Xiaoling Li ◽  
Xiaoming Yu ◽  
Ningning Wang ◽  
Qizhi Feng ◽  
Zhenying Dong ◽  
...  
Keyword(s):  
Tissue Culture ◽  
Wild Barley ◽  
Hordeum Brevisubulatum

scholarly journals Characterization of Selected Plant Growth-Promoting Rhizobacteria and Their Non-Host Growth Promotion Effects

2021 ◽  
Author(s):  
Di Fan ◽  
Donald L. Smith
Keyword(s):  
Arabidopsis Thaliana ◽  
Plant Growth ◽  
Plant Growth Promotion ◽  
Growth Promotion ◽  
Plant Growth Promoting Rhizobacteria ◽  
Content Type ◽  
Host Growth ◽  
Plant Growth Promoting ◽  
Growth Promoting

There are pressing needs to reduce the use of agrochemicals, and PGPR are receiving increasing interest in plant growth promotion and disease protection. This study follows up our previous report that the four newly isolated rhizobacteria promote the growth of Arabidopsis thaliana .

scholarly journals Mapping the Forage Nitrogen-Phosphorus Ratio Based on Sentinel-2 MSI Data and a Random Forest Algorithm in an Alpine Grassland Ecosystem of the Tibetan Plateau

2020 ◽  
Vol 12 (18) ◽  
pp. 2929
Author(s):  
Jinlong Gao ◽  
Jie Liu ◽  
Tiangang Liang ◽  
Mengjing Hou ◽  
Jing Ge ◽  
...  
Keyword(s):  
Random Forest ◽  
Nutrient Deficiency ◽  
Growth Period ◽  
N:P Ratio ◽  
Alpine Grassland ◽  
Estimation Accuracy ◽  
Ecological Indicator ◽  
The Tibetan Plateau ◽  
Nitrogen Phosphorus ◽  
Sentinel 2

Nondestructive and accurate estimating of the forage nitrogen–phosphorus (N:P) ratio is conducive to the real-time diagnosis of nutrient limitation and the formulation of a management scheme during the growth and development of forage. New-generation high-resolution remote sensors equipped with strategic red-edge wavebands offer opportunities and challenges for estimating and mapping forage N:P ratio in support of the sustainable utilization of alpine grassland resources. This study aims to detect the forage N:P ratio as an ecological indicator of grassland nutrient content by employing Sentinel-2 multispectral instrument (MSI) data and a random forest (RF) algorithm. The results showed that the estimation accuracy (R2) of the forage N:P ratio model established by combining the optimized spectral bands and vegetation indices (VIs) is 0.49 and 0.59 in the vigorous growth period (July) and the senescing period (November) of forage, respectively. Moreover, Sentinel-2 MSI B9 and B12 bands contributed greatly to the estimation of the forage N:P ratio, and the VIs (RECI2) constructed by B5 and B8A bands performed well in the estimation of the forage N:P ratio. Overall, it is promising to map the spatial distribution of the forage N:P ratio in alpine grassland using Sentinel-2 MSI data at regional scales. This study will be potentially beneficial in implementing precise positioning of vegetation nutrient deficiency and scientific fertilization management of grassland.

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