Thesis Abstract:  “Research on identifying new varieties and cultivated techniques protocols to improve productivity and economic efficiency in tomato cultivation in Red River Delta”. PhD. Thesis. Dang Van Nien.

Information on new findings of the doctoral thesis: Title of the research “Studying the growth, development capacities and technical measures to increase yields, qualities of some exotic orchid cultivars (Cattleya, Dendrobium, Oncidium) for Northern Vietnam” (PhD. Thesis: Hoang Xuan Lam)

A total of 310  lines (BC₂F₂) derived from the cross of OM5930/N22 were evaluated for heat stress at flowering. Genetic map was set up with 264 polymorphic SSRs to detect linkage to the target traits. The map covers 2,741.63 cM with an average interval of 10.55 cM between marker loci. Markers associated with heat tolerance were located mostly on chromosomes  3, 4, 6,  8 , 10, and 11

RNA silencing has been regarded as a natural self-defense mechanism to protect plants from their pathogen invasion. Thus, there has been a variety of gene silencing strategies developed and exploited the natural pathway to generate virus-resistant plants. The newly developed artificial microRNA technology is generally recognized as an effective method of down-regulating target genes.

The study on rice production and marketing via survey showed that farmers in Mekong had 0.5 ha, 2.2 ha and 6.5 ha for minimum, average and maximum farm size per household, respectively. 100% households carried out their rice production in winter- spring (Dong Xuan-DX) and summer- autumn (He Thu- HT) seasons

The study showed that capacity of rice milling plants ranged from 30 tons to 500 tons per day, average of 170.2 tons/day. There were 20% millers operated over ideal capacity / year, from 130 – 141%. However, almost millers (80%) operated below ideal capacity/year. The paddy inputs among millers were ranged from 6 tons to 500 tons/day, average with 136 tons/day.

SSR  genotyping was  combined with selective genotyping to map quantitative trait loci (QTLs) associated with drought tolerance in rice. A total of 229lines (BC2F2) derived from the cross of OM1490/WAB880-1-38-18-20-P1-HB was evaluated for drought at flowering (DRF), root dry weight (RDW)

The study conducted from December 2011 to June 2012, the approach is to apply theory ” ValueLinks” (2007) – Eschborn - GTZ (Deutsche Gesellchaft für Technische Zusammenarbeit-Đức) and ”Market for  the Poor – Tool of value chain analysis” -  M4P (2007).

The objectives of study were to determine some limitation factors on yield of bottle gourd and to find out one  -  two  cucurbit  rootstocks which might highly compatible with bottle gourd plant; high quality and main diseases tolerance. The study was included one survey and two experiments.

Study on controlling Ralstonia solanacearum bacterium disease of gourp crop by grafted technicque was conducted in Tra Vinh province anh Ho Chi Minh city from October 2010 to June 2012