Light sensitivity of shoot hydraulic conductance in five temperate deciduous tree species

Krõõt Aasamaa, Anu Sõber

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    The light sensitivity of the shoot hydraulic conductance in five temperate deciduous tree species was measured using two methods to clarify the role of light sensitivity and the suitability of the methods used to study it. The light sensitivity measured using a method that included an interruption of ≤10 min in shoot light acclimation did not differ from that measured using a method with continuous illumination. The ‘noncontinuous light’ methods are suitable for measuring hydraulic conductance and its light response. Light sensitivity correlated with other leaf water traits as follows: positively with the ion-mediated
    increase in xylem hydraulic conductance; a relative decrease in the hydraulic conductance of the laminae in response to HgCl2; a relative change in stomatal conductance in response to changes in PAR intensity or atmospheric CO2
    concentration, or to a decrease in air humidity or leaf water potential; and with instantaneous water use efficiency. The traits correlated negatively with shoot hydraulic conductance, stomatal conductance and relative increases in stomatal
    conductance in response to increases in leaf water potential. We suggest that high light sensitivity should be considered as one of the characteristics of conservative water use in trees. Low blue light increased shoot hydraulic conductance to a
    similar extent to moderate white light and twice as much as moderate red light. Blue light perception is important in the light sensitivity mechanism.

    Original languageEnglish
    JournalFunctional Plant Biology
    Issue number8
    Pages (from-to)661-669
    Number of pages9
    Publication statusPublished - 2012
    MoE publication typeA1 Journal article-refereed

    Fields of Science

    • 1183 Plant biology, microbiology, virology
    • Acer platanoides
    • Padus avium
    • Populus tremula
    • Salix caprea
    • Tilia cordata

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