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.

Development and Release of Late Blight-Resistant Tomato Varieties ‘Meru’ and ‘Kiboko’

Abstract: Late blight caused by Phytophthora infestans (Mont.) De Bary is among the most economically important diseases of tomato. The use of host–plant resistance offers a potentially cost-effective and environmentally sound complementary disease management strategy for incorporation into tomato late blight integrated pest management (IPM). Late blight resistance in tomato (Solanum lycopersicum L.) was derived from S. pimpinellifolium and introgressed into highland-adapted tomato already resistant to Fusarium wilt, root-knot nematodes, tomato mosaic virus (ToMV) and tomato yellow leaf curl virus (TYLCV). Evaluation and selection for durability of late blight resistance, yield, and other horticultural traits was done in a controlled environment at AVRDC, The World Vegetable Center headquarters in Shanhua, Taiwan, and under field conditions at the Regional Center for Africa in Arusha, Tanzania. Four lines were subjected to multilocational trials with a local check at 5 sites representing 4 agroecological zones. Two...

Pheromone Blend Analysis and Cross-Attraction among Populations of Maruca vitrata from Asia and West Africa

Abstract: The legume pod borer, Maruca vitrata, is a pantropical pest on leguminous crops. (E,E)-10,12-Hexadecadienal, (E,E)-10,12-hexadecadienol, and (E)-10-hexadecenal were described previously as sex pheromone components for this nocturnal moth. A blend of these components in a ratio of 100:5:5 attracted males in field trapping experiments in Benin, but not in Taiwan, Thailand, or Vietnam. This finding suggests geographic variation in the pheromone blend between Asian and West African populations of M. vitrata. We, therefore, determined the pheromone compositions of single pheromone glands of females from the three Asian regions and from Benin by gas chromatography-mass spectrometry. Additionally, we compared the responses of males from Taiwan and Benin to calling females and to gland extracts of females from both regions in laboratory no-choice and two-choice assays. Chemical analysis revealed the presence of (E,E)-10,12-hexadecadienal and (E,E)-10,12-hexadecadienol, as well as the absence of (E)-10-hexadecenal in all four populations. The relative amounts of the detected compounds did not vary significantly among the insect populations. The behavioral bioassays showed that Taiwanese and Beninese males were similarly attracted to females from both regions, as well as to their gland extracts. As a result, we did not find geographic variation in the sexual communication system of M. vitrata between West African and Asian insect populations.

Applications and Major Achievements of Genome Editing in Vegetable Crops: A Review.

Abstract: The emergence of genome-editing technology has allowed manipulation of DNA sequences in genomes to precisely remove or replace specific sequences in organisms resulting in targeted mutations. In plants, genome editing is an attractive method to alter gene functions to generate improved crop varieties. Genome editing is thought to be simple to use and has a lower risk of off-target effects compared to classical mutation breeding. Furthermore, genome-editing technology tools can also be applied directly to crops that contain complex genomes and/or are not easily bred using traditional methods. Currently, highly versatile genome-editing tools for precise and predictable editing of almost any locus in the plant genome make it possible to extend the range of application, including functional genomics research and molecular crop breeding. Vegetables are essential nutrient sources for humans and provide vitamins, minerals, and fiber to diets, thereby contributing to human health. In this review, we provide an overview of the brief history of genome-editing technologies and the components of genome-editing tool boxes, and illustrate basic modes of operation in representative systems. We describe the current and potential practical application of genome editing for the development of improved nutritious vegetables and present several case studies demonstrating the potential of the technology. Finally, we highlight future directions and challenges in applying genome-editing systems to vegetable crops for research and product development.

Pesticide Risk Behavior and Knowledge of Chili and Tomato Farmers

Abstract: Intensification of agricultural land use in developing countries is coincident with increased use of synthetic pesticides, which could lead to misuse and overuse. For measures to reduce risk from pesticides to be effective, it is necessary to understand farmers’ rationale for pesticide use. This study was undertaken to analyze the relationship between pesticide use and farmers’ risk behavior and knowledge of pesticide risk. Data were gathered from 200 Thai farmers growing hot (chili) pepper (Capsicum annuum L) and tomato (Solanum lycopersicum L). Pesticide risk knowledge was measured using a pesticide risk beliefs inventory. Risk behavior was measured with farmers making pesticide use decisions under hypothetical situations. Farmers were highly risk averse because they preferred to incur a high cost of pesticides to quickly eliminate pest problems. Regression analysis indicated that pesticide use is positively associated with lower levels of pesticide knowledge and higher levels of risk aversion. ...