|dc.contributor||AVRDC - The World Vegetable Center||en|
|dc.description.abstract||Abiotic and biotic stresses are major constraints of vegetable production in the tropics and climate change is expected to aggravate these problems. Depending upon the crop, the combined effects of multiple stresses may reduce total yield, reduce product quality, increase postharvest losses, and alter nutrient content. Consequently, vegetable varieties for the tropics should possess tolerance to heat, salinity, and other abiotic stresses, carry an array of disease and insect resistances, and still produce high yields of good quality produce that meet market requirements. Meeting this challenge requires robust protocols to screen and identify useful alleles from exotic germplasm and efficient selection methods to facilitate incorporation of multiple stress-tolerance genes into new varieties. Development of tropically adapted varieties of tomato (Solanum lycopersicum L.) and pepper (Capsicum annuum) is a high priority at AVRDC – The World Vegetable Center. Tomato production in the tropics has been devastated by increased incidence and severity of tomato yellow leaf curl diseases (TYLCD) caused by whitefly-vectored begomoviruses. Development of resistant varieties is complicated because the pathogen is highly diverse and almost all TYLCD resistance genes originated from wild tomato species. Application of marker-assisted selection (MAS) by AVRDC has facilitated development of tomato varieties homozygous for multiple begomovirus resistance genes that are expected to offer higher levels of resistance to a wider range of begomoviruses. Most modern tomato varieties are sensitive to heat, drought, and salinity, but sources of stress tolerance have been found mainly in wild tomato accessions. AVRDC uses a multidisciplinary approach to map genes conditioning heat, drought, and salinity tolerance in tomato and to identify markers linked to targeted genes to facilitate gene introgression. Sweet pepper is a high value crop but sensitive to heat. AVRDC’s strategy to develop a tropical sweet pepper emphasizes the evaluation of sweet pepper lines under Taiwan summer stress (high temperatures and humidity) for yield components (fruit number, fruit weight) and traits linked to heat stress adaptation (pollen viability, root mass, vegetative biomass). Lines performing well for different components or traits have been identified and our hypothesis is that crossing lines with complementary traits and selection will lead to new lines with improved levels of heat tolerance. Breeding varieties adapted to climate change will shift more attention toward breeding for tolerance to abiotic stresses, which are often genetically and physiologically complex. Manipulation of multiple genes and traits will complicate vegetable breeding and will require effective use of conventional breeding techniques and molecular markers involving multidisciplinary teams.||en_US|
|dc.relation||Proceedings of the Workshop on Crop Breeding and Management of Agricultural Environment for Coping with Climate Change: 163-171||en_US|
|dc.relation||Special Publication of TARI No. 156||en_US|
|dc.title||Solanaceous Vegetable Breeding at AVRDC–The World Vegetable Center to Meet the Challenges of Climate Change in the Tropics||en_US|
|dc.relation.conference||Proceedings of the Workshop on Crop Breeding and Management of Agricultural Environment for Coping with Climate Change||en_US|
|Appears in Collections:||作物組|
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