Vietnam Academy of Agricultural science VAAS

Thanh Tri, Vietnam

Vietnam Academy of Agricultural science VAAS

Thanh Tri, Vietnam
SEARCH FILTERS
Time filter
Source Type

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.


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.


Thi Tuyet N.,Vietnam Academy of Agricultural science VAAS | Elsen A.,Bodemkundige Dienst van Belgie | Elsen A.,North West University South Africa | Huu Nhi H.,Vietnam Academy of Agricultural science VAAS | And 2 more authors.
Russian Journal of Nematology | Year: 2012

Ten Pratylenchus coffeae populations collected from different crops in different agroecological regions in Vietnam were compared on the basis of both light microscope and scanning electron microscope observations (morphological and morphometrical characters) to assess the intraspecific variability of these characters. The results revealed the presence of substantial variability in morphology and morphometry within and between these populations. However, these differences fall within the range of the morphological and morphometrical variability described previously in P. coffeae populations from other parts of the world. Our scanning electron microscopy observations further confirm that in P. coffeae there is a complete fusion of the 1st (lip) annulus with the oral disc resulting in an undivided en face view with no division between the lateral and median (sub-dorsal and sub-ventral) segments of the 1 st (lip) annulus. Although canonical discriminant analysis enabled the separation of the ten P. coffeae populations from Vietnam examined in three groups based on a combination of five morphological characters for the males, there was no relationship between these groups and their geographic origin or between these groups and the host plants from which they were originally isolated.


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
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.


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.


Trinh M.V.,Vietnam Academy of Agricultural science VAAS | Tesfai M.,Norwegian Institute of Bioeconomy Research | Borrell A.,University of Queensland | Nagothu U.S.,Norwegian Institute of Bioeconomy Research | And 3 more authors.
Paddy and Water Environment | Year: 2016

Vietnam is one of the world’s top two rice exporting countries. However, rice cultivation is the primary source of agriculture’s greenhouse gas (GHG) emissions in Vietnam. In particular, strategies are required to reduce GHG emissions associated with the application of organic and inorganic fertilisers. The objective of this study was to assess the effects of various combinations of biochar (BIOC), compost (COMP) and slow-release urea (SRU) on methane (CH4) and nitrous oxide (N2O) emissions. In total, 1170 gas samples were collected from closed gas chambers in rice paddies at Thinh Long commune and Rang Dong farm in northern Vietnam between June and October 2014. The gas samples were analysed for CH4-C and N2O-N fluxes using gas chromatography. The application of BIOC alone resulted in the lowest CH4 emissions (4.8–59 mg C m−2 h−1) and lowest N2O emissions (0.15–0.26 µg N m−2 h−1). The combined application of nitrogen–phosphorus–potassium (NPK) + COMP emitted the highest CH4 (14–72 mg C m−2 h−1), while ½NPK + BIOC emitted the highest N2O (1.03 µg N m−2 h−1 in the TL commune), but it was the second lowest (0.495 µg N m−2 h−1) in the RD farm. Green urea and orange urea reduced N2O emissions significantly (p < 0.05) compared to white urea, but no significant differences were observed with respect to CH4 emissions. SRU fertilisers and BIOC alone measured the lowest greenhouse gas intensity, i.e. <2.5 and 3 kg CO2 eq. kg−1 rice grain, respectively. Based on these results, application of fertilisers in the form of BIOC and/or orange or green urea could be a viable option to reduce both CH4 and N2O emissions from rice paddy soils. © 2016 The International Society of Paddy and Water Environment Engineering and Springer Japan


Birtha P.S.,National Center for Agricultural Economics and Policy Research | Minh T.T.,Vietnam Academy of Agricultural science VAAS | Chinh N.T.,Vietnam Academy of Agricultural science VAAS | Anh D.T.,Vietnam Academy of Agricultural science VAAS | And 4 more authors.
Outlook on Agriculture | Year: 2011

Enabled by land reforms and fuelled by technological change, agricultural production in Vietnam grew tremendously after the mid-1980s. Focusing on groundnut, an export-oriented cash and food crop, this paper provides estimates of potential benefits from the adoption of improved varieties in northern Vietnam. At farm level, switching over to improved varieties generates additional revenue of VND1.8 to 3.9 million per hectare (US$1 is equivalent to about VND15,969). The aggregate benefits for northern Vietnam are huge. With the groundnut area remaining unchanged, the annual value of benefits from the adoption of improved varieties in 80% of the area by 2020 will be VND571,691 million (US$35.8 million) at a real discount rate of 5%. These benefits will be 14% larger if the groundnut area continues to expand at the rate achieved in the recent past.


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.


Suu T.D.,Kyushu University | Hoai T.T.T.,Kyushu University | Hoai T.T.T.,Vietnam Academy of Agricultural Science VAAS | Hoa N.T.L.,Kyushu University | And 3 more authors.
Journal of the Faculty of Agriculture, Kyushu University | Year: 2013

Twenty two waxy rice cultivare originated from Central Vietnam were used for studying the variation on starch properties and the relationship to single nucleotide polymorphism in the SSIIa gene. A wide range of alkali digestibility level among 22 waxy rice cultivars was observed and recorded as low, intermediate and high alkali digestibility groups. All 22 waxy rice cultivars has significantly higher proportion of fa (DP≦12) and markedly lower proportion of fb1 chains with DP from 12 to 24 whereas the little difference was observed in proportion fb2 (25≦DP≦36) and fb3 (DP≧37) between waxy cultivars tested and IR36. The nucleotide changes in three exons (exon 1, exon 2 and exon 8) were observed in 22 waxy rice cultivars. Of the six single nucleotide polymorphism (SNPs) in the coding region, two SNPs, CVT (at site 516 bp) in exon 2 and G/T (at site 3903) in exon 8, were silent substitution while other four caused amino acid replacement. The SNP at position 264 bp in exon 1, was found an G-to-C transition causing change of glutamic to aspartic while the SNP at 3,799 bp in exon 8, resulting in glycine to serine change. The SNP at 4,198 bp, causing methionine to valine. The SNP at 4,329-4330 bp was observed a GC-to-TT transition leading to change of glycine-leucine change to glycine-phenylalanine. The study suggested that the wide variation on alkali digestibility and amylopectin fine structure in waxy rice starch was caused by the nucleotide diversity of SSlIa gene besides of other starch synthase genes involving in amylopectin synthesis.

Loading Vietnam Academy of Agricultural science VAAS collaborators
Loading Vietnam Academy of Agricultural science VAAS collaborators