scholarly journals Registration of three peanut allotetraploid interspecific hybrids resistant to late leaf spot disease and tomato spotted wilt

2021 ◽  
Author(s):  
Ye Chu ◽  
H. Thomas Stalker ◽  
Kathleen Marasigan ◽  
Chandler M. Levinson ◽  
Dongying Gao ◽  
...  
Keyword(s):  
Leaf Spot ◽  
Interspecific Hybrids ◽  
Leaf Spot Disease ◽  
Late Leaf Spot ◽  
Spot Disease ◽  
Tomato Spotted Wilt

scholarly journals Lack of Induced Systemic Resistance in Peanut to Late Leaf Spot Disease by Plant Growth-Promoting Rhizobacteria and Chemical Elicitors

Plant Disease ◽  
2001 ◽  
Vol 85 (8) ◽  
pp. 879-884 ◽  
Author(s):  
Shouan Zhang ◽  
M. S. Reddy ◽  
Nancy Kokalis-Burelle ◽  
Larry W. Wells ◽  
Stevan P. Nightengale ◽  
...  
Keyword(s):  
Leaf Spot ◽  
Acquired Resistance ◽  
Plant Growth Promoting Rhizobacteria ◽  
Systemic Resistance ◽  
Leaf Spot Disease ◽  
Late Leaf Spot ◽  
Spot Disease ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
Significant Disease

A disease assay was optimized for late leaf spot disease of peanut using Cercosporidium per-sonatum in the greenhouse, and this assay was used in attempts to elicit induced systemic resistance using strains of plant growth-promoting rhizobacteria (PGPR) and chemical elicitors. Nineteen strains of spore-forming bacilli PGPR, including strains of Paenibacillus macerans, Brevibacillus brevis, Bacillus laterosporus, B. subtilis, B. pumilus, B. amyloliquefaciens, B. sphaericus, B. cereus, and B. pasteurii, which previously elicited systemic disease control activity on other crops, were evaluated in greenhouse assays. Seven PGPR strains elicited significant disease reduction in a single experiment; however, none repeated significant protection achieved in the greenhouse assay, while significant protection consistently occurred with the fungicide chlorothalonil (Bravo). In other greenhouse trials, neither stem injections of C. personatum nor foliar sprays of chemicals, including salicylic acid, sodium salicylate, isonicotinic acid, or benzo[1,2,3]thiadiazole-7-carbothioc acid S-methyl ester (Actigard), which elicit systemic acquired resistance on other crops, elicited significant disease protection. In contrast, foliar sprays with DL-β-amino-n-butyric acid (BABA), which is an elicitor of localized acquired resistance, resulted in significantly less late leaf spot disease in one of two tests. Combination treatments of four PGPR strains with BABA in the greenhouse did not significantly protect peanut from late leaf spot. Field trials conducted over two growing seasons indicated that none of the 19 PGPR strains, applied as seed treatments at two concentrations, significantly reduced late leaf spot disease. The same chemical elicitors tested in the greenhouse, including BABA, did not elicit significant disease protection. Some combinations of four PGPR and BABA significantly reduced the disease at one but not at two sample times. Collectively, these results suggest that late leaf spot resistance in peanut is not systemically inducible in the same manner as is resistance to diseases in other crops by PGPR and chemical inducers.

scholarly journals Field reactions of interspecific hybrids of tomato (Solanum lycopersicon Mill.) lines to leaf spot disease

Agro-Science ◽  
2015 ◽  
Vol 13 (3) ◽  
pp. 15
Author(s):  
C Amaefula ◽  
CU Agbo ◽  
BC Echezona ◽  
GE Nwofia
Keyword(s):  
Leaf Spot ◽  
Interspecific Hybrids ◽  
Leaf Spot Disease ◽  
Solanum Lycopersicon ◽  
Spot Disease

Metabolic profiling for dissection of late leaf spot disease resistance mechanism in groundnut

2021 ◽  
Author(s):  
M. K. Mahatma ◽  
Lokesh Kumar Thawait ◽  
K. S. Jadon ◽  
P. P. Thirumalaisamy ◽  
S. K. Bishi ◽  
...  
Keyword(s):  
Disease Resistance ◽  
Leaf Spot ◽  
Metabolic Profiling ◽  
Resistance Mechanism ◽  
Leaf Spot Disease ◽  
Late Leaf Spot ◽  
Spot Disease

scholarly journals Analysis of Resistant Mechanisms in Groundnut Genotypes against Late Leaf Spot Disease

2021 ◽  
Vol 8 (7) ◽  
pp. 1-14
Author(s):  
K. Karunanithi ◽  
G. Senthilraja ◽  
K. Subrahmaniyan
Keyword(s):  
Arachis Hypogaea ◽  
Polyphenol Oxidase ◽  
Leaf Spot ◽  
Biochemical Parameters ◽  
Biochemical Analysis ◽  
Phenylalanine Ammonia Lyase ◽  
Leaf Spot Disease ◽  
Total Phenols ◽  
Late Leaf Spot ◽  
Spot Disease

Forty two groundnut (Arachis hypogaea) cultivars were screened for resistance to Phaeoisariopsispersonata under glasshouse conditions. Among them, two germplasms (VG19561 and VG19654) were found to have resistance against late leaf spot. Biochemical parameters such as, phenylalanine ammonia-lyase, peroxidase, polyphenol oxidase and total phenols were estimated among the resistant germplasms and susceptible check, VRI2. biochemical analysis revealed the increased activities of the enzymes viz., phenylalanine ammonia lyase, peroxidase, polyphenol oxidase, and phenolics in the resistant germplasms viz., VG19561 and VG19654 than the susceptible check, VRI 2.

scholarly journals Antifungal Effects against Phaeoisariopsis personata under Greenhouse Conditions and Phytochemical Analysis of Jatropha curcas Leaf Extracts

2021 ◽  
Vol 26 (02) ◽  
pp. 231-240
Author(s):  
Magreth Francis
Keyword(s):  
Jatropha Curcas ◽  
Leaf Spot ◽  
Growth And Yield ◽  
Leaf Spot Disease ◽  
Phytochemical Analysis ◽  
Leaf Extracts ◽  
Late Leaf Spot ◽  
Spot Disease ◽  
Antifungal Effects ◽  
Phytochemical Constituents

The study was conducted to test the antifungal efficacy of J. curcas leaf extracts against Phaeoisariopsis personata (causal pathogen for groundnut late leaf spot disease) under in vivo conditions, and to identify important phytochemical constituents exhibiting antifungal properties. The results showed that the greatest reduction of late leaf spot disease incidence was achieved by all the Jatropha curcas leaf extracts at the highest concentration (0.5 mg mL-1) as 36.89, 36.59 and 24.67% for chloroform, ethyl acetate and methanolic extracts, respectively. Subsequently, J. curcas leaf extracts treatments enhanced the growth and yield of groundnut compared with the control (untreated). The antifungal effects of J. curcas were supported by the presence of phytochemical constituents identified by GC-MS. Hexadecane; n-hexadecanoic acid; phenol, 2, 4 bis (-dimethylethyl); phytol and hexadecanoic methyl ester were detected as major phytocompounds in J. curcas leaf extracts that were possibly responsible for the antifungal activity. © 2021 Friends Science Publishers

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