A semi-physiological model of cold hardening and dehardening in walnut stem

Poirier, Magalie; Lacointe, André; Améglio, Thierry
December 2010
Tree Physiology;Dec2010, Vol. 30 Issue 12, p1555
Academic Journal
It has been hypothesized that the increase in temperature in this century could lead to an increase in frost damage to plant tissues. Several models have been proposed to describe the development of cold hardiness, but never taking into account extreme climatic and/or physiological events. Our results on walnut tree (Juglans regia L.) show that cold hardiness was best correlated with average daily temperatures minimal temperatures over the last 15 days before sampling (), indicating that the freezing tolerance depended on the tree's climatic history. Moreover, this study also shows that the accumulation of sucrose and the water content (WC) decrease are an essential step towards cold hardiness. Thus, a simple linear model based on climatic () and physiological (soluble sugars, WC) explanatory variables was developed to predict the cold hardiness level in walnut stem at any time during the leafless period. Each of the three input variables can be assigned a specific role contributing to the simulated function, cold hardiness. The extent and robustness of this relation was assessed on extreme physiological events on walnut trees bearing three main branches. On each tree, one branch was defoliated to limit the local carbohydrate and transpiration, one was girdled to increase local carbohydrate and prevent carbohydrate export and the third one was kept untreated as control. As expected, these treatments impacted both local carbon reserves and WC in the stems born by each main branch in comparison with the control on the same tree. The impact of these treatments on stem's freezing tolerance, as evaluated by an electrolyte leakage method (LT50), confirmed the direct impact of soluble sugar and WC on cold hardiness over a wide range of carbohydrate and WC. This is discussed in relation to the branch autonomy theory for carbon but also for water during summer growth and winter periods. The present study demonstrates the importance of physiological parameters in the prediction of cold hardiness and proposes a way to model cold hardiness with extreme climatic and/or physiological events.


Related Articles

  • Huge carbohydrate assimilates delay response to complete defoliation stress in oil palm (Elaeis guineensis Jacq.). Ajambang, Walter; Ardie, Sintho W.; Volkaert, Hugo; Galdima, Madi; Sudarsono, S. // Emirates Journal of Food & Agriculture (EJFA);2015, Vol. 27 Issue 1, p126 

    Understanding how and when crops cope with and respond to stress during reproductive development may be able to forecast total crop production under abrupt climate change. We studied the effect of complete defoliation under time-specific climate-related conditions on inflorescence sex...

  • Winter stem xylem pressure in walnut trees: effects of carbohydrates, cooling and freezing. Améglio, Thierry; Ewers, Frank W.; Cochard, Hervé; Martignac, Michel; Vandame, Marc; Bodet, Christian; Cruiziat, Pierre // Tree Physiology;2001, Vol. 21 Issue 6, p387 

    Pressure transducers were attached to twigs of orchard trees and potted trees of walnut (Juglans regia L.) to measure winter stem xylem pressures. Experimental potted trees were partially defoliated in the late summer and early autumn to lower the amount of stored carbohydrates. Potted trees...

  • Northern Grassland's Greenhouse Gas Emission Is Robust to Experimental Warming and Defoliation. Attaeian, Behnaz; Cahill, James F.; Bork, Edward W.; Chang, Scott X. // Caspian Journal of Applied Sciences Research;2013, Vol. 2 Issue 9, p49 

    The continued increase in global temperatures is widely expected to influence soil greenhouse gas emissions (GHG) in grazed grassland ecosystems. This study was conducted to quantify the effects of experimental warming and simulated grazing on greenhouse gas emissions in a northern temperate...

  • Time is the true test for evaluating plant damage. Hirsch, Rick // Malakoff News (TX);1/4/2008, Vol. 99 Issue 1, p6A 

    The article reflects the author's perspective relative to the true test for evaluating plant damage during extensive winter in Texas.

  • Influence of initial levels of carbohydrates, fructans, nitrogen, and soluble proteins on regrowth of L. cv. Bravo following defoliation. Morvan-Bertrand, A; Morvan-Bertrand, Annette; Boucaud, J; Boucaud, Jean; Prud'homme, M-P; Prud'homme, Marie-Pascale // Journal of Experimental Botany;Dec99, Vol. 50 Issue 341 

    Evaluates the role of nitrogen and carbohydrate reserves on the regrowth of Lolium perenne cv. Bravo following defoliation. Use of nitrogen fertilization levels; Relation of the yield of leaf dry matter at the end of the regrowth period to the initial level of carbohydrate reserves; Increase in...

  • GET THEE TO THE GREEK. Brown, Jordana // Muscle & Performance;Jun2012, Vol. 4 Issue 6, p82 

    The article shows various ways to consume Greek yogurt. People can mix consumption of Greek yogurt with honey and walnuts to provide themselves with protein, slow-digesting carbohydrates, and healthy fats. People can also add their preferred whey protein powder into the yogurt to absorb fast-...

  • Frosty Warning. Major, Jason; Hickey, Georgina // Nature Australia;Winter99, Vol. 26 Issue 5, p11 

    Reports on the findings on the effect of levels of carbon dioxide in the atmosphere to the sensitivity of plants to frost. Information on the experiment of Jason Lutze of the Australian National University on a Snow Gum subjected to the vagaries of the weather; Implications of the findings on...

  • Efecto de los carbohidratos sobre la micropropagación de Alnus glutinosa (L.) Gaertn. San José, M. C.; Corredoira, E.; Janeiro, L. V. // Spanish Journal of Rural Development;Oct2011, Vol. 2 Issue 4, p9 

    This paper describes the effect of carbohydrates on shoot development and adventitious root formation in two clones of adult origin of Alnus glutinosa (L.) Gaertn. previously established in vitro. Woody Plant Medium was used during the multiplication stage, supplemented with 0.5 mg / l indole...

  • RELAÇÃO ENTRE CONCENTRAÇÕES FOLIARES DE CARBOIDRATOS SOLÚVEIS TOTAIS E TOLERÂNCIA AO FRIO EM DIFERENTES ESPÉCIES DE Eucalyptus spp. Pitz Floriani, Mireli Moura; Steffens, Cristiano André; Chaves, Djalma Miler; Do Amarante, Cassandra Vidal Talamini; Pikart, Tiago Georg; Santos Ribeiro, Maitê dos // Ciência Florestal (01039954);mar2013, Vol. 23 Issue 1, p165 

    This work was carried out to evaluate the effects of the rustification on cold tolerance in Eucalyptus dunnii Maiden, Eucalyptus benthamii Maiden & Cambage, Eucalyptus grandis W. Hill ex Maiden, and Eucalyptus saligna Sm., by quantifying leaf contents of total soluble carbohydrates and proline....


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics