World Vegetable Center

About: World Vegetable Center is a nonprofit organization based out in Tainan City, Taiwan. It is known for research contribution in the topics: Population & Agriculture. The organization has 294 authors who have published 364 publications receiving 8785 citations. The organization is also known as: AVRDC, Asian Vegetable Research and Development Center.

Susceptibility of major lepidopterans to δ-endotoxins and a formulation of Bacillus thuringiensis (B.t.) on vegetable brassicas in Taiwan

Abstract: Baseline susceptibility of Plutella xylostella, Crocidolomia binotalis and Hellula undalis to Bacillus thuringiensis (B.t.) δ-endotoxins (Cry1Aa, Cry1Ab, Cry1Ac, Cry1Ca) and a formulation (Xentari®) was assessed using a leaf-dip bioassay method. The toxins Cry1Ac, Cry1Aa and Cry1Ca were equally toxic to P. xylostella. Crocidolomia binotalis was highly susceptible to all Cry1A toxins and it was least sensitive to Cry1Ca. Conversely, H. undalis was highly sensitive to Cry1Ca, but less susceptible to Cry1A toxins. Hence, the susceptibility of H. undalis to Xentari®, a formulation containing Cry1C as a major toxin, was significantly higher than C. binotalis or P. xylostella.

Potential Impact of Alternative Agricultural Technologies to Ensure Food Security and Raise Income of Farm Households in Rwanda

Abstract: Rapid population growth and stagnation of agricultural yields in Rwanda have caused a steady decline in food production per capita, a continuous expansion towards the use of marginal land and a strong degradation of land. The challenge of simultaneously achieving food security, rural welfare, land protection and soil fertility regeneration in the face of its high population is overwhelming to Rwanda. The objectives of this article are to assess the potential impacts of the alternative agricultural technologies on income, food production and soil loss for four arable farm household types and to assess policies that could induce adoption of these technologies. These include combined use of Tithonia diversifolia (green manure) and Diammonium phosphate. The bio-economic farm household model used has a form of a mathematical form of quadratic programming model. Model results show that these alternative agricultural technologies will clearly enhance food production and income for all farm household types except...

Characterization of the Complete Genome of a Novel Polerovirus Infecting Sauropus androgynus in Thailand

Abstract: Leaf samples from Thailand of Sauropus androgynus (L.) Merr. plants presenting leaf yellowing symptoms were screened by reverse transcription polymerase chain reaction for the presence of polerovirus infection. In five of eight samples, a polerovirus was detected, and in four of these five polerovirus-positive samples, a begomovirus infection had been detected in a previous study. The complete polerovirus genome sequence was determined from the sample which was not also infected with a begomovirus. Analysis of the sequence revealed the typical genome organization of a polerovirus. The highest nucleotide sequence identity to any other polerovirus species sequence in GenBank was 49% to pepper yellow leaf curl virus (PYLCV), and the highest amino acid sequence identity of all deduced protein sequences was 70% with the coat protein of PYLCV. Based on these findings, we propose this novel polerovirus species be named Sauropus yellowing virus (SaYV).

Characterization and mapping of a QTL derived from Solanum habrochaites associated with elevated rutin content (quercetin-3-rutinoside) in tomato

Abstract: Consumption of flavonoids found in fruits and vegetables is linked to beneficial health outcomes. Tomato is among the most widely consumed and economically important vegetables worldwide and improvement of the nutrient content could lead to significant health benefits. Rutin, (quercetin-3-rutinoside), the main flavonol in tomato fruit, is confined to the peel. Rutin synthesis is limited by low expression of chalcone isomerase, the enzyme catalyzing the conversion of naringenin chalcone to naringenin quercetin. The wild tomato species Solanum habrochaites is a major source of new alleles to improve cultivated tomato (Solanum lycopersicum). AVRDC—The World Vegetable Center identified introgression line (IL) LA3984 containing a segment of S. habrochaites on chromosome 5 expressing high levels of rutin in full red ripe fruit. An AVRDC high rutin tomato line evaluated for 2 years and two seasons in Taiwan produced mean rutin content about four- to five-fold greater than the mean of all entries and about 11–12 times higher than the commercial fresh market and processing tomato cultivars. The quantitative trait locus (QTL) conditioning high rutin content was mapped to a 0.42 Mb segment on chromosome 5 flanked by markers c2_At3g55120/TaqI and ch05-4.883/ApaLI. Marker c2_Atg55120 overlaps with the chalcone-flavonone isomerase gene Solyc05g10320, and a second chalcone-flavonone isomerase gene is located 3,000 bp upstream from c2_At3g551220. Results of this project will facilitate breeding of high flavonoid tomato lines.