University of Arkansas

The University of Arkansas Grape Breeding Program (University of Arkansas System Division of Agriculture) is one of the most successful and influential university-led fruit research initiatives in the United States. Operating out of the Fruit Research Station in Clarksville, this scientific center achieved a major breakthrough in developing winter-hardy, high-quality seedless table grapes (raisin varieties) that combine exceptional fruit attributes with strong resistance to diseases and climate stresses.

History of Establishment and Stages of Development

The program was initiated in January 1964 by the distinguished American pomologist and geneticist, Dr. James N. Moore. Returning to his native Arkansas after a prominent career with the United States Department of Agriculture (USDA), he set an ambitious goal: to breed table grape cultivars uniquely engineered for the challenging and volatile climate of the US Mid-South and Midwest.

Dr. Moore directed the program until his retirement in 1996, establishing a powerful genetic foundation. He was succeeded by his student, Distinguished Professor John R. Clark, who spearheaded the research for over 25 years and elevated the program to international commercial prominence. Since its inception, the center has generated and evaluated over 300,000 grapevine seedlings.

Core Areas of Scientific Activity

The Arkansas breeding school operates at the intersection of classical interspecific hybridization and modern molecular genetics, including the pioneering use of DNA markers. Core focus areas include:

• Stenospermocarpic Seedlessness: Breeding table grapes with a high class of seedlessness, where seed traces remain completely imperceptible during consumption.
• Adaptability and Winter Hardiness: Selecting vines capable of tolerating severe winter temperature fluctuations and deep freezes characteristic of continental climates.
• Fruit Quality and Texture: Prioritizing crisp flesh, rain-crack resistant skin, and complex, appealing fruit-to-muscat flavor profiles.
• Disease Resistance: Reducing the chemical footprint in vineyards by embedding genetic resistance to downy mildew, powdery mildew, and anthracnose.

Contribution to Breeding and Key Achievements

The primary achievement of the University of Arkansas fruit breeding program is the development of the renowned "planetary" series of seedless grape varieties, which revolutionized northern commercial and private viticulture. Due to their high genetic adaptability, excellent graft take, and enhanced bud and cane cold hardiness, these American varieties have become widely distributed in many viticultural regions globally, including the CIS countries.

Among the most famous varieties developed by the University of Arkansas are:

• Legendary Seedless Varieties ("Planetary Series"): Jupiter (one of the most popular and reliable dark-skinned seedless grapes with a light muscat and fruity flavor), Neptune (a crisp white variety with a fruity taste), Mars (Mars), Saturn (Saturn), and Venus (Venus).
• New Generation ("Virtue Series"): Faith (Faith), Gratitude (Gratitude), Hope (Hope), and Joy (Joy).
• Wine and Juice Varieties (Technical): Sunbelt (a resilient alternative to Concord for premium juice and wine production), Opportunity (Opportunity), and Enchantment (Enchantment).

The valuable genetic material established by University of Arkansas scientists is currently utilized by breeding programs worldwide. The modern breeding infrastructure, led by Dr. Margaret Worthington, continues to pursue research aimed at combining superior berry quality with absolute plant resistance to biotic and abiotic stress factors.