Physiological and biochemical parameters: new tools to screen barley root exudate allelopathic potential (Hordeum vulgare L. subsp. vulgare)
Morphological markers/traits are often used in the detection of allelopathic stress, but optical signals including chlorophyll a fluorescence emission could be useful in developing new screening techniques. In this context, the allelopathic effect of barley ( Hordeum vulgare subsp. vulgare ) root ex...
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Published in | Acta physiologiae plantarum Vol. 40; no. 2; pp. 1 - 14 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
Berlin/Heidelberg
Springer Berlin Heidelberg
01.02.2018
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | Morphological markers/traits are often used in the detection of allelopathic stress, but optical signals including chlorophyll
a
fluorescence emission could be useful in developing new screening techniques. In this context, the allelopathic effect of barley (
Hordeum vulgare
subsp.
vulgare
) root exudates (three modern varieties and three landraces) were assessed on the morphological (root and shoot length, biomass accumulation), physiological (
F
v
/
F
m
and
F
0
), and biochemical (chlorophyll and protein contents) variables of great brome (
Bromus diandrus
Roth., syn.
Bromus rigidus
Roth. subsp.
gussonii
Parl.). All the measured traits were affected when great brome was grown in a soil substrate in which barley plants had previously developed for 30 days before being removed. The response of receiver plants was affected by treatment with activated charcoal, dependent on barley genotype and on the nature of the growing substrate. The inhibitory effect was lower with the addition of the activated charcoal suggesting the release of putative allelochemicals from barley roots into the soil. The barley landraces were more toxic than modern varieties and their effect was more pronounced in sandy substrate than in silty clay sand substrate. In our investigation, the chlorophyll content and
F
v
/
F
m
were the most correlated variables with barley allelopathic potential. These two parameters might be considered as effective tools to quantify susceptibility to allelochemical inhibitors in higher plants. |
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ISSN: | 0137-5881 1861-1664 |
DOI: | 10.1007/s11738-018-2604-0 |