scholarly journals PENETRATION, DEVELOPMENT, AND REPRODUCTION OF Meloidogyne enterolobii ON Psidium SPECIES AND INDUCED CELLULAR RESPONSES IN THE ROOTS

2017 ◽  
Vol 39 (2) ◽  
Author(s):  
ALAIN DENIS DE SOUSA ◽  
ELVIRA MARIA RÉGIS PEDROSA ◽  
CLÁUDIA ULISSES DE CARVALHO SILVA ◽  
JOSÉ MAURO DA CUNHA E CASTRO ◽  
JULIANA MARTINS RIBEIRO
Keyword(s):  
Agricultural Research ◽  
Cellular Responses ◽  
The Other ◽  
Germplasm Bank ◽  
Feeding Sites ◽  
Efficient Management ◽  
Meloidogyne Enterolobii ◽  
Resistant Varieties ◽  
Reproduction Factor ◽  
Semi Arid

ABSTRACT Meloidogyne enterolobii has severely compromised the main guava producing regions in Brazil, thereby stimulating the development of resistant varieties for efficient management of this nematode. This study aimed to assess the penetration, development, reproduction, and induced cellular responses of M. enterolobii in roots of four species of the genus Psidium (P. guajava‘Paluma’, P. guineense, P. cattleyanum, and P. friedrichstalianum) from the Active Germplasm Bank (BAG) of the Center for Agricultural Research of the Semi-arid Tropics (Embrapa Semi-arid) located in Petrolina, PE, Brazil. Three experiments were carried out to assess the penetration, development, and reproduction of the nematode and, subsequently, histological analyses were performed. Nematode penetrated indistinctly in both resistant and susceptible species, but only in ‘Paluma’ an evolution was observed from vermiform juveniles to “sausage” and globose forms in experiment 1. In experiment 2, all species presented “sausage” forms of nematode, but only in ‘Paluma’, these forms reached adult female stages. In experiment 3, only ‘Paluma’ was susceptible to M. enterolobii, with reproduction factor above unity. Histological analyses showed that, except for P. guajava, the other Psidium species presented poorly developed feeding sites at 20 days after inoculation.

scholarly journals New method for screening rice varieties against Bakanae disease

2014 ◽  
Vol 42 (2) ◽  
pp. 315-320 ◽  
Author(s):  
KS Hossain ◽  
MAT Mia ◽  
MA Bashar
Keyword(s):  
Screening Method ◽  
The Other ◽  
Screening Methods ◽  
Germplasm Bank ◽  
Rice Varieties ◽  
Bakanae Disease ◽  
Living Culture ◽  
Resistant Varieties ◽  
Millipore Membrane ◽  
Varietal Screening

Several varietal screening methods were tested along with dipping dry seeds into millipore membrane filtrate of spore suspension of the pathogen and gibberellic acid (GA3) in different concentrations. It was found that GA3 can be used to screen out susceptible rice varieties against bakanae disease. The method which requires the use of GA3 is easier than the other methods for mass screening as it does not require maintaining living culture of the pathogen. The protocol of inoculum free varietal screening method for bakanae disease of rice was developed to find out resistant varieties from the huge collections of germplasm bank. DOI: http://dx.doi.org/10.3329/bjb.v42i2.18036 Bangladesh J. Bot. 42(2): 315-320, 2013 (December)

scholarly journals Dissimilarity of barley powdery mildew resistances Lomerit and Heils Hanna

2011 ◽  
Vol 47 (No. 3) ◽  
pp. 95-100 ◽  
Author(s):  
A. Dreiseitl
Keyword(s):  
Powdery Mildew ◽  
Agricultural Research ◽  
Blumeria Graminis ◽  
The Other ◽  
Japanese Isolate ◽  
Agricultural Research Institute ◽  
Reaction Type ◽  
Barley Cultivars ◽  
Barley Powdery Mildew ◽  
Old Japanese

  The resistance Heils Hanna (HH) was postulated in several tens of 471 previously tested winter barley cultivars. In this paper, new tests on 29 of these cultivars are reported. Thirty-two reference isolates of Blumeria graminis f.sp. hordei held in the pathogen genebank at the Agricultural Research Institute in Kromeriz, Ltd. including a Japanese isolate and five Israeli isolates were used for response tests. However, the resistance HH conferred by the gene Mla8 and herein characterised by reaction type 0 to an old Japanese isolate known as Race I was now postulated only in four cultivars. In the other 25 cultivars another resistance, characterised by reaction type 0 to Race I and also to two Israeli isolates, was detected. In addition to the two mentioned resistances, eight known (Bw, Dr2, Ha, IM9, Ln, Lv, Ra and Sp) resistances were found in the set examined. Lomerit was the only registered cultivar tested here in which the newly detected resistance was present alone, therefore, it is recommended that this resistance be designated Lo.

scholarly journals Screening of Salt Tolerant CIP Potato Germplasm for Saline Areas

2013 ◽  
Vol 11 (1) ◽  
pp. 95-102 ◽  
Author(s):  
MH Rahman ◽  
MM Alam Patwary ◽  
H Barua ◽  
M Hossain ◽  
MM Hasan
Keyword(s):  
Soil Salinity ◽  
Agricultural Research ◽  
Saline Soil ◽  
The Other ◽  
Salt Tolerant ◽  
Agricultural Research Institute ◽  
International Potato ◽  
Local Variety ◽  
Potato Germplasm ◽  
High Level

Fifteen salt tolerant CIP (International Potato Centre) Potato genotypes along with BARI (Bangladesh Agricultural Research Institute) Alu 7 (Diamant) and one local variety viz., Dohazari Sada were evaluated at Bashkhali, Chittagong during 2011-12 to screen the suitable genotypes for cultivation in saline areas of Bangladesh. Diamant and Dohazari Sada and all of the CIP genotypes were found to grow well up to 60 DAP (Days After Planting) at saline areas having healthy plants and no senescence was noticed but after that 61-100% plants died due to high level of soil salinity (6.41dS/m) depending on genotypes. Genotype CIP 112 gave the highest yield (21.07 t/ha) and CIP 102 was comparatively less affected by soil salinity than the other genotypes. However, all the salt tolerant CIP genotypes were found to be promising in the saline soil. DOI: http://dx.doi.org/10.3329/agric.v11i1.15249 The Agriculturists 2013; 11(1) 95-102

scholarly journals Reaction of potential guava rootstocks to Meloidogyne enterolobii

Revista CERES ◽  
2018 ◽  
Vol 65 (3) ◽  
pp. 291-295 ◽  
Author(s):  
Fernando Marcelo Chiamolera ◽  
Antonio Baldo Geraldo Martins ◽  
Pedro Luiz Martins Soares ◽  
Tatiana Pagan Loeiro da Cunha-Chiamolera
Keyword(s):  
Root System ◽  
Fusarium Solani ◽  
Root Rot ◽  
System Development ◽  
Control Treatment ◽  
Root Knot Nematode ◽  
Second Stage ◽  
Root System Development ◽  
Meloidogyne Enterolobii ◽  
Reproduction Factor

ABSTRACT Root-knot nematode Meloidogyne enterolobii is the main phytosanitary problem of guava cultivation in Brazil. Among the strategies to manage the problem, the best prospects are in identifying or developing cultivars or rootstocks that are resistant to this nematode. To identify plants with potential as rootstocks for guava, the reaction of araçá (wild guava) to M. enterolobii was assessed in a greenhouse experiment. Seven araçá species were evaluated (Eugenia stipitata, Psidium acutangulum, P. cattleyanum ‘yellow’, P. friedrichsthalianum, P. guajava var. minor, P. guineense, and Psidium sp.). The plants were inoculated with a suspension of 3,000 eggs of M. enterolobii, using eggplant as control treatment. The parameters fresh root mass, number of eggs and second stage juveniles (J2) per root system, the reproduction factor (RF = Pf/Pi), and araçá reaction were determined during the experiment. RF of the araçá species E. stipitata, P. cattleyanum ‘yellow’, and P. friedrichsthalianum was less than one (RP < 1), therefore resistant to M. enterolobii. The araçá trees had good root system development and the susceptible plants showed many root galls, high number of eggs and J2, and Fusarium solani and Rhizoctonia solani root rot. The araçá species, P. cattleyanum ‘yellow’, P. friedrichsthalianum, and E. stipitata are resistant to M. enterolobii and can be tested as potential guava rootstocks.

scholarly journals Resistance to nematode Meloidogyne paranaensis in Arabica coffee genotypes introgressed with Coffea liberica

2020 ◽  
pp. 1236-1241
Author(s):  
Gustavo H. Sera ◽  
Filipe G. Carvalho ◽  
Inês C. de B. Fonseca ◽  
Luciana H. Shigueoka ◽  
Santino A. da Silva ◽  
...  
Keyword(s):  
Germplasm Bank ◽  
Breeding Programs ◽  
Arabica Coffee ◽  
Randomized Design ◽  
Mother Plants ◽  
Completely Randomized Design ◽  
Set Up ◽  
Moderately Resistant ◽  
Reproduction Factor ◽  
Coffea Liberica

The aim of this study was to prove that Arabica coffee introgressed with C. liberica, have resistance to Meloidogyne paranaensis (Mp). Open pollinated fruits were harvested from mother plants of 29 Arabica coffee genotypes from the IAPAR germplasm bank. Seeds were collected from the fruits and were sown to obtain seedlings to test the resistance to Mp. The experiment was set up in a completely randomized design with 29 coffee genotypes, 8 replications, and one plant per plot. Cultivars Catuaí Vermelho IAC 99 and IPR 100 were used as susceptible and resistant checks, respectively. Seedlings with three to four pairs of leaves were inoculated with 1,400 eggs and juveniles J2 of Mp (IP). At 120 days after inoculation, seedlings were evaluated by counting the nematodes per gram of roots, and the final nematodes population was obtained (FP). The reproduction factor (RF) was calculated using the formula: RF = FP/IP. The reproduction factor reduction was used to classify the resistance levels of genotypes, which were classified as highly resistant (HR), resistant (R), moderately resistant (MR), moderately susceptible (MS), susceptible (S) an highly susceptible (HS). All genotypes differed from Catuaí in resistance factor (RF), five of which did not differ from IPR 100 for RF, and only the line IAPAR 15242 had RF < 1.0. Out of 28 Arabica genotypes introgressed with C. liberica, five HR, 11 R, 11 MR and one MS were identified. However, only IAPAR 15242 and IPR 100 were classified as HR and presented 100% of HR plants, but only the first showed an RF < 1.0. Results revealed that these Arabica coffee genotypes with introgression of C. liberica genes have great potential to be used in breeding programs and they are a new alternative as a source of resistance.

scholarly journals Do the stage of plant and initial population of root knot nematode influence on sweet pepper development?

O Biológico ◽  
2020 ◽  
Vol 82 (1) ◽  
pp. 1-10
Author(s):  
Samara A. de Oliveira ◽  
Juliana M. O Rosa ◽  
Juliana Eulálio ◽  
Claudio Marcelo G. de Oliveira
Keyword(s):  
Sweet Pepper ◽  
Initial Population ◽  
Root Knot Nematode ◽  
One Pot ◽  
Leaf Pair ◽  
Final Population ◽  
Randomized Design ◽  
Meloidogyne Enterolobii ◽  
Shoot Weight ◽  
Reproduction Factor

The aim of this study was to investigate the response of three different stages (one, three and five leaf pairs) of sweet pepper (Capsicum annuum cv. Orazio) seedlings to five inoculation levels of Meloidogyne enterolobii (zero (control), 300, 1000, 3000 and 10000) under greenhouse conditions. Each plant was cultivated in one pot filled with 3.8 L of substrate. The test was a completely randomized design with four replications. The plants were assessed 60 days after inoculation, plant shoot weight, final population of nematodes, and reproduction factor were measured. The results were fitted to Seinhorst model: Y = m + (1-m). ZPi –T. The results showed a tolerance limit (T) of 2,500 nematodes for plants with one and three leaf pair, and 8,500 nematodes for the five-leaf pair plant.

scholarly journals Combining a Matheuristic with Simulation for Risk Management of Stochastic Assets and Liabilities

Risks ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 131
Author(s):  
Christopher Bayliss ◽  
Marti Serra ◽  
Armando Nieto ◽  
Angel A. Juan
Keyword(s):  
Risk Management ◽  
Time Horizon ◽  
Safety Margin ◽  
Integer Program ◽  
The Other ◽  
Insurance Companies ◽  
Relevant Issue ◽  
Efficient Management ◽  
Simulation Optimisation ◽  
Simulation Results

Specially in the case of scenarios under uncertainty, the efficient management of risk when matching assets and liabilities is a relevant issue for most insurance companies. This paper considers such a scenario, where different assets can be aggregated to better match a liability (or the other way around), and the goal is to find the asset-liability assignments that maximises the overall benefit over a time horizon. To solve this stochastic optimisation problem, a simulation-optimisation methodology is proposed. We use integer programming to generate efficient asset-to-liability assignments, and Monte-Carlo simulation is employed to estimate the risk of failing to pay due liabilities. The simulation results allow us to set a safety margin parameter for the integer program, which encourage the generation of solutions satisfying a minimum reliability threshold. A series of computational experiments contribute to illustrate the proposed methodology and its utility in practical risk management.

scholarly journals Dynamics of Mango Seedlings and Mango Varieties: A Case Study of Nurseries in Mango Production Center in Majalengka, West Java, Indonesia

Proceedings ◽  
2020 ◽  
Vol 36 (1) ◽  
pp. 41
Author(s):  
Puspitasari ◽  
Qanti ◽  
Hardiyanto
Keyword(s):  
Research And Development ◽  
Agricultural Research ◽  
International Markets ◽  
The Other ◽  
West Java ◽  
Tropical Fruit ◽  
Pests And Diseases ◽  
The University ◽  
Low Rate

Mango is a favorite tropical fruit in both domestic and international markets. Due to its features that are relatively easy to grow and more resistant to pests and diseases, the success rate of producing the seedlings is higher compared to the other perennial fruit plants. Despite of these advantages, the sector is still facing several constrains. One of them is the low rate of certified seedling used that may affects the productivity of mango trees. Limited availability of superior certified mango seedlings that is faced by mango nurseries is suspected as one of the cause. This paper aims to describe the dynamic that occurs in mango nursery sector in one of mango production centres in West Java. The data was collected through survey of 260 nurseries in 2016 and was part of Indohort project research; a collaboration between Australian Centre for International Agricultural Research (ACIAR), Iindonesian Center for Horticulture Research and Development (ICHORD), and the University of Adelaide. The results showed that: (1) Only 7% of the total number of nurseries has a formal certification for seedlings that are produced, (2) in average, mango nurseries produce less mango seedlings in 2016 compared to 2011; (3) mango nursery’s specialization rate decreased from 32% in 2011 to 19% in 2016, (4) the share of Harumanis (mango variety that is most preferred in Indonesia) seedlings production per nursery, decreased from 89% in 2011 to 65% in 2016; (4) Further improvement related to mango seedlings marketting chain needs to be done to create a better mango seedling market structure along the chain.

Molecular assessment of maize inbred lines (Zea mays L.) Using microsatellite markers

2018 ◽  
Vol 43 (4) ◽  
pp. 533-542
Author(s):  
Maniruzzaman ◽  
MG Azam ◽  
S Islam ◽  
MG Hossain ◽  
MM Rohman
Keyword(s):  
Genetic Diversity ◽  
Plant Breeding ◽  
Genetic Relatedness ◽  
Agricultural Research ◽  
Inbred Lines ◽  
The Other ◽  
Diversity Analysis ◽  
Genetic Diversity Analysis ◽  
Maize Inbred Lines ◽  
Maize Genotypes

Genetic diversity analysis and germplasm characterization are essential steps in plant breeding and molecular markers are proved tool to accomplish. The present study was undertaken at the Molecular Breeding Lab of Plant Breeding Division, Bangladesh Agricultural Research Institute (BARI) to determine the genetic relatedness and molecular characterization of 15 maize inbred lines of BARI. In present study, genetic diversity analysis was performed by using 10 SSR primers to evaluate the polymorphisms, among them six primers showed distinct polymorphism between the maize inbred lines. The maize genotypes E81, E144, E08, E167, E102, E142 and E121 were found more diverged (0.9003) compared to other inbred lines. On the other hand, the lowest genetic distance values (0.1501) were found between the genotype E140 and genotype E80 followed by genotype E126 and genotype E140; genotype E140 and genotype E65; genotype E65 and genotype E80 values were identical (0.4502). The genotypes viz. E81, E144, E08, E167, E102, E142 and E121 were found far away from centroid of the cluster and rest of the genotypes were placed around the centroid. The Principal Coordinate Analysis (PCO) helped to visualize four major clusters and showed that seven maize inbred lines (E81, E58, E08, E167, E102, E142 and E121) were far away from the other genotypes. In conclusion, SSR markers enabled discrimination among accessions and provided valuable information for future use in improvement of these genomic resources.Bangladesh J. Agril. Res. 43(4): 533-542, December 2018

scholarly journals Reproduction of Meloidogyne enterolobii in lettuce cultivars of the American group

2015 ◽  
Vol 33 (2) ◽  
pp. 147-150
Author(s):  
Érika CSS Correia ◽  
Norberto Silva ◽  
Marylia GS Costa ◽  
Silvia RS Wilcken
Keyword(s):  
Reproductive Potential ◽  
Egg Mass ◽  
Root Knot Nematodes ◽  
Second Stage ◽  
American Group ◽  
Meloidogyne Enterolobii ◽  
Meloidogyne Spp ◽  
Gall Index ◽  
Summer Time ◽  
Reproduction Factor

Lettuce is the main vegetable cultivated in Brazil, in volume and in marketed value. There are ranges of diseases which may affect lettuce crops, including those caused by root-knot nematodes (Meloidogyne spp.). We evaluated the reproductive potential of Meloidogyne enterolobii in 22 lettuce cultivars. The plants were inoculated with 5,000 eggs and eventuals second stage juveniles of nematode per pot, two days after the transplanting. 'Rutgers' tomato was used as standard for inoculum viability of M. enterolobii. We evaluated, 60 days after inoculation, the gall index, egg mass index and reproduction factor (RF). The 'Ithaca', 'Raider Plus', 'RS-1397', 'L-104', 'Challenge', 'IP-11', 'Classic', 'Salinas 88', 'Vanguard 75', 'Calona' and 'Desert Queen' were resistant to M. enterolobii with RF varying from 0.22 to 0.9, and the cultivars Lady Winterset, Robinson, Sonoma, Raider, Lucy Brown, Bnondaga, Summer Time, Taina, Sundevil and L-109 were susceptible to this nematode, with RF ranging from 1.06 to 5.73.

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