+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Three different methods for measuring xylem cavitation and embolism: a comparison

, : Three different methods for measuring xylem cavitation and embolism: a comparison. Annals of Botany 67(5): 417-424

Three different methods for measuring xylem embolism due to water cavitation were compared--the acoustic method, the hydraulic method and the anatomical method. Young plants of Ceratonia siliqua L. were water stressed for 9, 16 and 23 d. Xylem cavitation was detected by counting ultrasound (100-300 khz) acoustic emissions (AE) from 1-year-old twigs (acoustic method). Xylem embolism was detected by measuring the loss of hydraulic conductivity of twigs of the same age (hydraulic method). The blockage of single xylem conduits was detected by perfusing Safranin into the xylem of 1-year-old twigs of stressed plants and measuring the number and the diameters of non-conducting xylem conduits, under the microscope (anatomical method). It was noted that: (a) the number of AE and the loss of conductivity increased with the water stress applied; (b) a linear relation seemed to exist between the number of AE and the loss of conductivity, suggesting that the AE counted could be only (or mainly) produced in the xylem conduits, (c) the vulnerability of the xylem conduits to embolism was a direct function of their diameter; and (d) the measured loss of conductivity was of the same order of magnitude as the theoretical one. The three methods gave fairly similar results. Nonetheless, they are not alternative to one another in that: (a) the acoustic method allows continuous recordings to be made but does not provide information about the actual damage suffered by plants; (b) the hydraulic method is very informative but destructive; and (c) the anatomical method is very useful both in phytogeographical and in genetic improvement studies.


Other references

Haycraft, J.B., 1894: On the role of sex in evolution. Report British Association, 691 & 692

Xie, T.; Ding, D., 2001: Investigating 42 candidate orthologous protein groups by molecular evolutionary analysis on genome scale. It is one of key problems for comparative genomics to accurately identify orthologous genes/proteins. Here 42 quartettes of human, yeast Saccharomyces cerevisiae, nematode Caenorhabditis elegans, and fruit fly Drosophila melanogaster candidate ort...

Fitzpatrick, J.; Kennedy, C.C., 1969: Serum hepatitis in a haemophiliac. British Medical Journal 4(5678): 299-299

Tan, K.K.; Cherian, A.; Teo, S.K., 1991: Tuberculosis in the elderly. A study of 120 cases of tuberculosis in patients aged 65 years and above revealed that there were more males than females with the disease compared with the younger age group of 15 to 45 years old. The elderly group also had significantly more sev...

Hulings, N.C.; Gray, J.S., 1976: Physical factors controlling abundance of meio fauna on tidal and atidal beaches. Quantitative samples of interstitial sand beach meiofauna were collected from Morocco along the N African coast (Algeria and Tunisia) and northwards to Lebanon, Turkey and Cyprus. Data on the sediment median diameter, sorting coefficient and beach...

Carter C.J.; Russell F.M., 2000: Modelling and design of block caving at Bingham Canyon. Publication Series - Australasian Institute of Mining and Metallurgy 7/2000: 347-355

Cella, C., 2006: SARE grant helps fund package bee & queen breeder comparison research. American bee journal 146(3): 231-234

Mazur, H.; Zadrozińska, J.; Kłosińska, J., 1987: Various pesticide residues in food products analysed 1980-1985. Organochlorine insecticides in various products of animal origin. Roczniki Panstwowego Zakladu Higieny 38(4-5): 368-375

Cason, J.A.; Lyon, C.E.; Papa, C.M., 1993: Influence of muscle opposition during rigor on development of broiler breast meat tenderness. Poultry Science 72(SUPPL 1): 158

Shariatpanahi, M.; Anderson, A.C., 1987: Coliphages and bacteria in groundwater from Tehran, Iran. Bulletin of Environmental Contamination and Toxicology 39(1): 92-99