Resistance to water flow through leaves of Coffea arabica is dominated by extra-vascular tissues

Functional Plant Biology : FPB
Antonio GascóS Salleo

Abstract

The leaf hydraulic conductance (Kleaf) of Coffea arabica L. was measured for shoots exposed to non-lethal temperature stress or to a freeze-thaw cycle, and compared with Kleaf of non-stressed samples (controls). Exposure to temperatures below 6°C for 1 h caused measurable damage to the functional integrity of cell membranes as shown by increased membrane leakiness to electrolytes. A 1 : 1 relationship was found to exist between relative electrolyte leakage and relative Kleaf suggesting that membrane damage caused Kleaf to increase. Low temperatures did not cause membrane disruption as shown by the comparison of chilled samples with frozen-thawed ones. In frozen leaves, membranes were extensively disrupted and both electrolyte leakiness and Kleaf increased 5-fold. Low temperatures did not induce alterations of the hydraulic properties of the leaf vascular system, as revealed by measurements of Kleaf after up to 500 cuttings of minor veins were made in the leaf blade of control and chilled leaves. Calculations showed that 62-75% of leaf hydraulic resistance resided in the extra-vascular water pathway. Results are discussed within the frame work of our current understanding of leaf hydraulic architecture as well as in terms of pla...Continue Reading

References

Feb 14, 2002·Plant, Cell & Environment·F. C. Meinzer
Jun 13, 2002·Physiologia Plantarum·Isabel BaigesAlberto Mas
Oct 16, 2002·Journal of Experimental Botany·Lawren SackN Michele Holbrook
Aug 13, 2003·Plant Physiology·Tim J Brodribb, N Michele Holbrook
Apr 6, 2004·Plant Physiology·Lawren SackN Michele Holbrook
Feb 1, 2004·Functional Plant Biology : FPB·Marilyn C BallRoger D Heady

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Citations

Aug 1, 2007·Functional Plant Biology : FPB·Fabio RaimondoMaria Assunta Lo Gullo
Jun 1, 2008·Functional Plant Biology : FPB·Sebastiano SalleoMaria Assunta Lo Gullo
May 4, 2006·Annual Review of Plant Biology·Lawren Sack, N Michele Holbrook
Mar 19, 2008·Physiologia Plantarum·Andrea NardiniSebastiano Salleo
Feb 21, 2008·Plant, Cell & Environment·Andrea NardiniSebastiano Salleo
Sep 6, 2008·Plant, Cell & Environment·Christine ScoffoniLawren Sack
May 20, 2011·Journal of Experimental Botany·Katline Charra-Vaskou, Stefan Mayr
Feb 1, 2013·Functional Plant Biology : FPB·Juan Pablo GiraldoN Michele Holbrook
Oct 26, 2005·Journal of Experimental Botany·Andrea Nardini, Sebastiano Salleo
Sep 6, 2011·Tree Physiology·Roman GebauerPaal Krokene
Jan 1, 2006·Functional Plant Biology : FPB·Krõõt Aasamaa, Anu Sõber
Oct 1, 2005·Functional Plant Biology : FPB·Andrea NardiniSebastiano Salleo

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