Issue link: http://winesandvines.uberflip.com/i/63937
GRAPE GRO WING growth with short canes and abundant laterals. It roots and grafts like 110R. 420A Mgt is a V. berlandieri x V. riparia hybrid that has low vigor and is relatively drought tolerant. It can respond well to deficit irrigation but has poor nematode resistance, and it roots and grafts with more difficulty. The mother vine grows well, with long canes and few laterals. The leaves are thicker, bumpier and occasionally three-lobed at the base. root architecture and drought tolerance The profile of root systems of rootstocks can have a major impact on drought tolerance. The most obvious is that deep roots enhance drought tolerance by seeking underground water, but root systems of rootstocks can be both deeply penetrating and shallow, a di- chotomy that reflects their water needs and utilization. The density of roots in the soil profile also varies. Some are pri- marily deep, some primarily shallow and some evenly distributed. The root architecture and density of the deep and surface roots relate directly to nutrient and water uptake. Some plants hydraulically lift water from deep in the soil profile to keep the surface roots active. These characteristics vary, allowing rootstocks to be more or less drought tolerant and impacting their ability to take up nutrients. The most deep-rooted rootstocks include Ramsey, 140Ru, 1103P and 110R. Broadly distributed roots are found in 1103P, Freedom, Harmony, St. George, O39-16, 5BB and 420A Mgt; 101-14 Mgt, Schwarzmann, 101-14 Mgt, 5C and 16161C have shallow roots. In collaboration with Andrew McElrone, Walker is breeding rootstocks to tolerate drought and control growth and their phenology—the cyclic and seasonal natural phenomena, espe- cially in relation to climate. They are trying to optimize root APPROVALS TTB LABEL Low per-label costs Gov't. Liaison Negotiations or Footwork Reasonable Hourly Rates TRADEMARK SEARCHES As Low as $185 Your trade names or designs are searched at the U.S. Patent Office to help establish valuable ownership Over 100 years' total staff experience handling every government liaison need for industry. or avoid costly legal liability. Phone or write for details. Phone: (703) 524-8200 Fax: 525-8451 TOLL-FREE 1-800-642-6564 Major Credit Cards Accepted www.trademarkinfo.com Since 1957 200 N. Glebe Rd., Suite 321 Arlington, Virginia 22203 74 Wines & Vines MAY 2012 For Further Information & Pricing Please Call or Write 1912 Concession 4 R.R. #2 Niagara-on-the-Lake Ontario, Canada LOS 1J0 Phone: 905-468-0822 Fax: 905-468-0344 SUPPLIERS OF QUALITY VIRUS CERTIFIED GRAFTED GRAPEVINES Deadline for Custom Grafted Order For Spring Planting is January of Previous Year Irrigation Dripline Holder •DripLok™ won't stretch out of shape. •Its built-in 'saddle' prohibits cutting into drip tubing. •Withstands mechanical harvesting stress. •Competitively priced. •Conveniently packaged. •Will last up to 5 years in the field. •Available in 2 sizes. For your nearest dealer, contact: dr. Jean-michel boursiqout (above) from inra in montpellier, france, uncovers v. berlandieri near fredericksburg, texas. architecture from shallow to deep-rooting angles (to the surface), root density from two-tiered to even distributions, hydraulic lift and water use efficiency/productivity, associating characteristics with drought tolerance and salt tolerance. They have been sourcing wild grapevines in the southwestern GovtLiaison_Dir08 11/29/07 2:00 PM PagMori_Nov05.qxt 9/19/05 3:29 PM Page 1AgfastDriplok_Sept07 8/9/07 11:56 AM P U.S. for further evaluation. These plants may be adapted to hot, dry saline conditions. They've found many promising individual vines, but the samples are very diverse and require complicated grouping. Walker also discussed the impact of the rootstocks on phe- nology of vines. He noted that rootstocks could impact crop ripening, which is more pronounced under limited irrigation or on shallow soils. Some studies have found differences of seven to 10 days between early rootstocks like 5C, 101-14, 1616C and Riparia Gloire, compared to late-maturing rootstocks like 420A and 140Ru. Other rootstocks lie between them. Finally, Walker commented about sustainable viticulture. Dry farming provides the truest expression of terroir, but it brings inherent yield and quality issues. Won't deteriorate in hot or cold weather or in harsh chemical environments. DRIPLOK™ Toll-Free: 877.552-4828 909.451.2299 • Fax: 909.593-8309