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 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.

The title “Completing a process of tomato growing (Solanum lycopersicum L.) in a high - yield production in glasshouse condition in Lam Dong province” was implemented at Lien Nghia town, Duc Trong district, Lam Dong province within two years from April 2010 to April 2012. The objectives were to accomplish a process of tomato planting in glasshouse condition with a target of high yields.

Bacterial wilt of tomato was described by Smith (1896) over 100 years ago, caused among the most serious diseases of tomato in tropical and subtropical area. It is now the major constraint on production of tomato in many parts of Vietnam.

Sulfur (S) is an important macronutrient needed for the normal crop performance. As S in an essential constituent of protein, S deficiency results in a limitation in protein synthesis. Sulfur deficiencies are becoming more common because of the cultivation of high yielding crop cultivars, intensive cultivation, application of fertilisers with little S or no S, cleaner atmospheres as well as reduction in retention of crop residues

The thesis “Identification of virus belong to Begomovirus genus infected Tomato yellow leaf curl disease (TYLCD) in Lam Dong province” was carried out from April 2009 to December 2010 at the Department of Biotechnology, Institute of Agricultural Sciences for Southern Vietnam. The aims of the study were to identify the virus belong to Begomovirus genus which infect yellow leaf curl disease on tomato in Lam Dong province.

Phytate, myo-inositol 1,2,3,4,5,6-hexakisphosphate, is the primary source of inositol and the major storage form phosphorus in agricultural feedstuffs, such as cereals, legumes, and oilseeds. Phytase, myo-inositol hexakisphosphate hydrolase (EC 3.1.3.8 for 3-phytase and 3.1.8.26 for 6-phytase), catalyzes the hydrolysis of phytate into myo-inositol and inorganic phosphates

The thesis “Assessment of the genetic diversity of black pepper cultivars (Piper nigrum L.) commonly planted in three main cultivated areas of the Southern provinces based on morphological characteristics” was conducted from May 2008 to August 2009

The study "Effects of heat treatment on bypass of protein materials for dairy cows" was conducted at the Institute of Agricultural Science for Southern Vietnam, Nong lam University and Thanh Binh dairy farm, Cu chi district, HCMC from January 2008 to November 2009 for determination of appropriate temperature and time of heat treatment to increase rumen bypass protein for dairy cows and effect of protein materials on milk yield and quality. There were 3 experiments.

The study on controlling black leaf mold on tomato (Lycopersicon esculentum Mill) in the rainy season at Cho Gao district, Tien Giang province was conducted in Cho Gao district and the Lab of Nong Lam university from April to November 2009. The study’s contents consisted of (i) investigating the prevalence and progress of black leaf mold on tomato in the rainy season;