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Tuyet N.T.,Vietnam Academy of Agricultural science VAAS | Elsen A.,Bodemkundige Dienst van Belgie | Nhi H.H.,Vietnam Institute of Agricultural Sciences | De Waele D.,Catholic University of Leuven | De Waele D.,North West University South Africa
Russian Journal of Nematology | Year: 2015

The in vivo reproduction of ten Prctylenchus coffeae populations, collected in different agroecological regions in Vietnam, on 13 agricultural crops was very similar. Of the 13 varieties of the 13 crops included in our study (one variety per crop), the varieties of banana, sugarcane, maize and upland rice were good hosts of P. coffeae. The soybean variety was a poor host and the varieties of groundnut, tomato, sweet potato, ginger, sesame, pineapple and citrus were very poor hosts or nonhosts of P. coffeae. The in vivo damage potential on the banana, coffee, sugarcane and maize varieties was very similar for all ten P. coffeae populations. All the P. coffeae populations were able to cause considerable damage to the vegetative growth of banana and coffee but not to sugarcane and maize. In view of the low reproduction on coffee, the extensive damage the P. coffeae populations caused on this agricultural crop is surprising and illustrates the high damage potential of P. coffeae on coffee. In general, there was similar in vivo reproduction on the 13 agricultural crops examined and in general, similar in vivo damage potential on banana, coffee, sugarcane and maize, indicating that the ten P. coffeae populations from Vietnam examined belong to the same pathotype.


Xuan T.D.,Hiroshima University | Phuong N.T.,Vietnam Academy of Agricultural science VAAS | Khang D.T.,Hiroshima University | Khanh T.D.,Agricultural Genetics Institute AGI
Sustainability (Switzerland) | Year: 2015

The use of biofuels helps to reduce the dependency on fossil fuels and therefore decreases CO2 emission. Ethanol mixed with gasoline in mandatory percentages has been used in many countries. However, production of ethanol mainly depends on food crops, commonly associated with problems such as governmental policies and social controversies. Sweet sorghum (Sorghum bicolor (L.) Moench) is one of the most potential and appropriate alternative crops for biofuel production because of its high biomass and sugar content, strong tolerance to environmental stress conditions and diseases, and wide adaptability to various soils and climates. The aim of this study was to select prospective varieties of sweet sorghum, optimum sowing times and densities to achieve high yields of ethanol production and to establish stable operational conditions in cultivating this crop. The summer-autumn cropping season combined with the sowing densities of 8.3-10.9 plant m-2 obtained the highest ethanol yield. Among cultivated locations, the soil with pH of 5.5 and contents of Al and Zn of 39.4 and 0.6 g kg-1, respectively, was the best condition to have an ethanol yield >5000 L ha-1. The pH ≥ 6.0 may be responsible for the significant reduction of zinc content in soils, which decreases both biomass of sweet sorghum and ethanol yield, while contents of N, P, K, organic carbon (OC) and cation exchange capacity (CEC), and Fe likely play no role. The cultivar 4A was the preferred candidate for ethanol production and resistant to pests and diseases, especially cut worm (Agrotis spp.). © 2015 by the authors.


Tuyet N.T.,Vietnam Academy of Agricultural science VAAS | Waeyenberge L.,Belgium Institute for Agricultural and Fisheries Research | Elsen A.,Bodemkundige Dienst van Belgie | Nhi H.H.,Food Crops Research Institute | And 2 more authors.
Russian Journal of Nematology | Year: 2014

Random amplified polymorphic DNA (RAPD) analysis of the complete genome and sequencing of the D2-D3 expansion segments of the 28S rDNA géhe were carried out to compare the intraspecific genomic variability of ten Prarylenchus coffeae populations collected from different agricultural crops in different agro-ecological regions in Vietnam. In addition, the RAPD bands were compared with these of P. speUeri, a species recently described from Ghana, while the D2-D3 sequences were compared with these of P. coffeae and closely related Prazylenchus species available in the GenBank database. As determined by RAPD bands analysis of the complete genome, genomic similarity did not correspond either with geographic or original host plant origin of the Vietnamese P. coffeae populations. As determined by sequence analysis of the D2-D3 28S rDNA expansion fragments, all ten P. coffeae populations from Vietnam examined were closely related to each other and with the P. coffeae populations of which the D2-D3 28S rDNA expansion fragments sequences were available from GenBank. Both the RAPD bands analysis of the complete genome and the sequence analysis of the D2- D3 28S rDNA expansion fragments indicate genetic divergence among the ten P. coffeae populations from Vietnam examined on the one hand and P. spe(jeri from Ghana on the other hand, confirming the validity of the latter species.


Tran D.S.,Kyushu University | Tran T.T.H.,Kyushu University | Nguyen T.L.H.,Kyushu University | Ha M.L.,Kyushu University | And 3 more authors.
Journal of the Faculty of Agriculture, Kyushu University | Year: 2012

Characterization of grain quality of rice germplasm is important for broadening the genetic base for breeding program. In this study, we characterize the grain size and apparent amylose content of ninety eight rice cultivars which collected from Central of Vietnam. The endosperm types of ninety eight Vietnamese rice cultivars were classified as waxy, opaque, white core and translucency, and GBSS level were divided into four groups, including absent, low, intermediate and high. In non-waxy group, the wide variation of apparent amylose content was observed in thirty four rice cultivars. The continuous variation on the apparent amylose content was observed in three respective groups of GBSS. The grain length showed the positive correlation with apparent amylose content while grain width showed negative correlation. The very low amylose class was not found in two regions including Central highland and South coastal central whereas the intermediate amylose class was not detected in the North central region of Vietnam.


Tuyet N.T.,Vietnam Academy of Agricultural science VAAS | Nhi H.H.,Vietnam Institute of Agricultural Sciences | de Waele D.,Catholic University of Leuven | de Waele D.,North West University South Africa
Archives of Phytopathology and Plant Protection | Year: 2013

The in vitro reproductive fitness on carrot discs of 10 Pratylenchus coffeae populations collected from different agricultural crops in different agro-ecological regions in Vietnam was studied and compared with the reproductive fitness of a P. coffeae population from Ghana. Few major differences in in vitro reproductive fitness on carrot discs among the 10 P. coffeae populations from Vietnam examined (with the exception of one population originally isolated from the roots of an unidentified ornamental tree and one population originally isolated from banana), and between these populations and the P. coffeae population originally isolated from banana in Ghana were observed. Our observations indicate that although the optimum temperature for reproduction of three P. coffeae populations from Vietnam examined is 25 °C to, at least, 30 °C, these populations are also tolerant to low temperatures (15-20 °C) enabling them to survive the low temperatures which occur during the winter in the northern and central parts of Vietnam. © 2013 Copyright Taylor and Francis Group, LLC.

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