Le nuove varietà di patate allevate dal Texas A&M Potato Breeding Program potrebbero entrare nel mercato francese degli avannotti in breve tempo, ha affermato Isabel Vales, Ph.D., allevatrice di patate del Texas A&M AgriLife presso il Dipartimento di scienze orticole del Texas A&M College of Agriculture and Life Sciences .

In una recente giornata campale nelle High Plains meridionali vicino a Springlake, Vales ha discusso degli ultimi cloni di patate che il programma di allevamento ha in cantiere.

"Siamo piuttosto entusiasti di un clone di patata sperimentale color ruggine che ha una caratteristica molto speciale:un'alta percentuale di amido e un'elevata gravità anche nelle condizioni di alta temperatura molto stressanti in Texas", ha detto Vales. "Penso che il mercato della trasformazione degli avannotti francesi, per il quale il Texas non ha rilasciato ruggine di trasformazione, sia una possibilità."

L'identificazione sperimentale della patata è COTX08063-2Ru. L'incrocio iniziale è stato fatto in Colorado e la selezione in Texas.

Storicamente, il Texas non è stato un attore in quel mercato della frittura francese, ha affermato Vales, principalmente a causa della forte concorrenza del nord-ovest, che è davvero forte in quel mercato.

"Ma anche, in Texas, non siamo in grado di ottenere gli alti solidi richiesti per i mercati di trasformazione. Di tutte le varietà e i cloni sperimentali che abbiamo valutato nel tempo, nessuno di loro aveva un'elevata gravità", ha affermato Vales. "Il clone sperimentale COTX08063-2Ru ha un peso specifico elevato, anche in condizioni di stress da calore elevato in Texas, e produce ottime patatine fritte. Questo è il secondo anno in cui questo clone è nella National French Fry Potato Trials."

Ha detto che la quantità di amido nei tuberi di patata è il fattore principale che determina l'uso di una patata. Alti solidi o gravità significa che le patate sono solide e dense. La resa delle patate è elevata, così come la materia amidacea. Le patate ad alto contenuto di amido sono spesso utilizzate per preparare alimenti trasformati come patatine fritte, patatine e patate disidratate. Le patate con livelli di amido da bassi a medi sono spesso utilizzate per il mercato azionario fresco o da tavola.

Collaborating across state lines to reach numerous markets

Vales said the Texas A&M Potato Breeding Program is part of the Southwestern Regional Potato Cultivar Development Project, a multi-state project funded by the U.S. Department of Agriculture National Institute of Food and Agriculture.

"The Southwestern program was established in 1997, and we are celebrating 25 years of successful collaborative work," she said.

In the U.S., Vales explained, there are four regional potato variety development groups involving 12 breeding programs in public land-grant universities and others within the USDA Agricultural Research Service. The regions are Northwestern—Washington, Oregon and Idaho; North Central—North Dakota, Wisconsin, Minnesota and Michigan; Northeastern—North Carolina, New York, Maine and Florida; and Southwestern—Texas, Colorado and California.

"In the southwestern region, we don't have a USDA-ARS contribution like the others do," she said.

Texas A&M University, Colorado State University and the University of California at Davis initiated the Southwestern Regional Potato Cultivar Development Project to meet the unique needs of the region's potato industry, Vales said.

Crosses and original selections are made in Colorado and Texas, followed by regional evaluation trials in all three states and additional states in the western region—Oregon, Idaho and Washington. Some french fry and chipping clones enter national trials every year.

"In the U.S., most potato breeding programs are public," Vales said. "The level of cooperation in potato breeding is unparalleled; potatoes developed by the Southwestern program are planted all over the U.S. and Canada. In the Southwestern region, we also evaluate potatoes developed by other regional programs."

She added that while federal funding is the program's main source for public breeding, other funds come from state departments of agriculture, national commodity groups like Potatoes U.S., foundations and in-kind support from growers. Additional funding comes from royalties derived from varieties released under plant variety protection, PVP, by the Texas A&M program.

"To obtain PVP, we have to declare that the potato varieties are unique, distinct and stable," Vales said. "Seed growers planting PVP varieties must pay royalties. Texas A&M has been very successful in that regard. The amount we received this past year is more than $900,000, and part of that is reinvested in the program."

Field day events introduce Texas A&M varieties, open market outlets

Vales said the trials in various locations across the state and field days are the best way to let growers and the industry know about the latest potato clones in the breeding pipeline.

"This year, we had 180 different clones in the field day display, representing fresh and processing market classes," she said. "Within the processing class, we had chippers and french fry types; within the fresh, we had reds, yellows, purples, smalls and fingerlings."

Around 48 people from various U.S. states and Canada attended the Springlake event. The attendees expressed interest in some clones and shared priorities and challenges with the Texas A&M Potato Breeding Team and other participants.

Early and advanced selected clones included in the field day are also evaluated in agronomic trials in Dalhart and the San Luis Valley, Colorado, as well as California around Bakersfield, South Central Valley and Tulelake, near the Oregon border.

Southwest region presents unique growing conditions, challenges for potatoes

She indicated that cooler nights favor higher yields and fewer tuber defects. Thus, in Texas, the yields get higher with elevation and latitude, which means "we typically obtain much higher yields and better tuber quality out of the Dalhart trials located in the Texas Panhandle."

High temperature during the growing season is a major abiotic stress in several of the Southwestern Region production areas, Vales said. Heat stress can trigger physiological defects and negatively affect tuber yield and quality. Sensitivity to internal tuber heat necrosis, growth cracks, reducing sugar build-up, brown center, hollow heart and heat sprouts are assessed from field-harvested tubers.

"The potato varieties we develop come in different tuber sizes, shapes, skin and flesh textures and colors that fit different market needs," Vales said. "For instance, we collaborate with Tasteful Selections, looking for clones with many small tubers. We are also growing fingerlings and bi-color potatoes. Recently, we developed a round russet with pink eyes and yellow flesh that was provided an exclusive release to explore new market opportunities."

The Texas A&M Norkotah Russet strains continue to be the most popular, with 35 licensees in 12 states, she said. These are fresh-market russets. Two other fresh-market russets growing in popularity are the Reveille Russet, which doubled acreage from 2020 to 2021, and Vanguard Russet. The heat tolerance and long dormancy of Reveille Russet and Vanguard Russet are attractive features to growers across the U.S. and Canada.

Expanding potato markets beyond the Southwestern Region

Potato entries are evaluated in each state's trials for numerous traits, including chip and french fry quality, Vales said. Top entries move to Southwestern for two years and Western Regional Trials for up to three years. Superior clones are released as new varieties. Also, Colorado, Texas and California participate in National Chip Processing Trials and the National Fry Processors Trials. Advanced selections are also sent to collaborators all over the U.S. and Canada.

Vales said the Southwestern Region Project shares breeding stocks and advanced selections with a dozen other states. Since the inception of the Southwestern Regional Potato Cultivar Development Project, 66 new cultivars and clonal selections have been released or co-released with other institutions. Colorado and Texas are responsible for 44 of those.

"These potato cultivars represent a substantial and increasing part of the national potato acreage and have significantly contributed to regional and national economies," Vales said.

Several potato cultivars released by the Southwestern Region were listed in 2021 among the top 50 grown based on seed acreage in the U.S. Those developed in the region ranked second among the four regional projects, behind the Northwest and substantially ahead of the North Central and Northeast projects. + Esplora ulteriormente

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