Needle cytokinin content as a sensitive bioindicator of N pollution in Sitka spruce

Collier, M.; Sheppard, Lucy J.; Crossley, A.; Hanke, David E.

doi:10.1046/j.1365-3040.2003.01109.x

Cited by 9 publications

(9 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to Massot et al (1994), Atanassova et al (1996) and Collier et al (2003) and others, the level and forms of endogenous cytokinins could be influenced by different stressors: usually the total level of cytokinins increase in response to stress, but the proportion of their active forms decrease. Significantly higher content of BA detected in pea plants growing on IAA ?…”

Section: Discussionmentioning

confidence: 99%

“…Phytohormone levels are modulated by different mechanisms, e.g. by their compartmentation, transport and especially changes in the levels of gene expression leading to synthesis of the enzymes involved in their biosynthesis, or by regulation of the enzymes that degrade or deactivate the hormones (Collier et al 2003;Vaseva-Gemisheva et al 2005). These changes, which could be induced by environmental factors, could be also used as early indicators of stress in plants.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Understanding the effect of organic pollutant fluoranthene on pea in vitro using cytokinins, ethylene, ethane and carbon dioxide as indicators

et al. 2010

View full text Add to dashboard Cite

Environmental contaminants like polycyclic aromatic hydrocarbons can influence many biochemical and physiological processes in plants. The effect of 0.1, 1 and 5 mg l -1 of fluoranthene (FLT) in combination with indole-3-acetic acid (IAA, 0.1 mg l -1 ) or a combination of IAA and N 6 -benzyladenine (BA, both 0.1 mg l -1 ) on the growth and production of ethylene, ethane and CO 2 in Pisum sativum L. cultivated for 21 days in vitro was investigated. In 21 days old plants also net photosynthesis rate, content of FLT and cytokinins were evaluated. FLT 5 mg l -1 significantly inhibited the growth of pea after 21 days in both IAA and IAA ? BA treatments, increased production of ethylene (by 11% in IAA and 14% in IAA ? BA treatments, respectively) and ethane (by 28 and 18%) and decreased production of CO 2 (by 23 and 29%). The net photosynthesis rate decreased in response to FLT concentration by up to 51% under saturating irradiation (600-1,200 lmol m -2 s -1 ), as found in IAA ? BA ? FLT 5 mg l -1 treatment. The content of FLT in pea plant shoots well correlated with increasing FLT treatment in both IAA and IAA ? BA medium. The content of cytokinins in pea shoots changed in response to FLT treatment. FLT 5 mg l -1 caused a rise in level of trans-zeatin (by 16% in IAA and 9% in IAA ? BA treatments, respectively), dihydrozeatin riboside (by 27 and 50%), benzyladenine (by 3 and 80%), benzyladenine riboside (by 44 and 17%) and meta-topolin riboside (by 139 and 214%), no change in isopentenyladenine level and a decrease in metatopolin level (by 33% in IAA and 36% in IAA ? BA treatments, respectively). Cultivation of plants in vitro allowed not only to assess their growth, photosynthetic activity and the level of cytokinins, but also to extend the knowledge about the effect of PAHs on production of gaseous stress indicators like ethylene, ethane and CO 2 . Recorded changes in all studied parameters show, that persistent organic pollutants like PAHs can negatively influence plant growth and development.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Understanding the effect of organic pollutant fluoranthene on pea in vitro using cytokinins, ethylene, ethane and carbon dioxide as indicators

et al. 2010

View full text Add to dashboard Cite

show abstract

“…Cytokinin ribosides are also considered mobile and can be transported across membranes and into the xylem and phloem (Collier et al 2003;Hirose et al 2005). Thus, the higher CK-R levels in the UO canopy could be a result of increased transport to the leaves through the transpiration stream.…”

Section: Variation In Leaf Cytokinin Profilesmentioning

confidence: 99%

Patterns of cytokinins and leaf gas exchange among canopy layers of a mature sugar maple (Acer saccharum) stand

Reeves

Farrow

Emery

2006

Trees

View full text Add to dashboard Cite

Leaf cytokinins (CKs) were profiled within four locations throughout the inner and outer layers of a mature sugar maple (Acer saccharum) canopy. Leaf CK was associated with leaf gas exchange activity and some corresponding microclimate variables. Both inner and outer layers in the upper canopy had higher concentrations of leaf CKs than the lower canopy layers and the difference was comprised primarily by riboside forms of CK. Transpiration (E) showed a similar pattern to leaf CK content, with significantly higher rates in the upper canopy. There was, however, no clear pattern discernable in stomatal conductance (gs), other than it tended to be higher in the outer canopy layers. The upper/outer canopy showed a significantly different environment than all other canopy positions with higher photosynthetically active radiation (PAR), ultra-violet light (UV-B) and leaf temperature. Simple linear regression analysis showed that the nucleotide CK group (including iPNT, cis-and trans-[9RMP]Z, [9RMP]DZ) was positively related to PAR. Exogenous applications of benzylaminopurine (BAP), showed that low concentrations of BAP reduced E and g s , and indicated that CK may help regulate stomatal aperture. The similar patterns in E and CK content suggest that CKs and leaf gas exchange are functionally connected.

show abstract

“…Elevated concentrations of these cytokinins were detected in the youngest needles with no visible damage. Unusually high levels of cytokinins were also found in needles of Norway spruce grown in polluted sites or on polluted substrates in Slovenia (Dent and Hanke 1995;Kraigher and Hanke 1996), as well as in Sitka spruce subjected to mist spraying with individual mineral components of aerial pollution, amongst which mineral N at neutral pH was the factor responsible (Collier et al 2003a). Since roots are an important site for cytokinin biosynthesis in higher plants, the export of cytokinin ribosides from the root system in damaged trees might have increased.…”

Section: Cytokinins and The Natural Environmentmentioning

confidence: 98%

Ozone Stress and Ectomycorrhizal Root–Shoot Signaling

Kraigher

Grebenc

Hanke³

2008

Mycorrhiza

View full text Add to dashboard Cite

Needle cytokinin content as a sensitive bioindicator of N pollution in Sitka spruce

Cited by 9 publications

References 45 publications

Understanding the effect of organic pollutant fluoranthene on pea in vitro using cytokinins, ethylene, ethane and carbon dioxide as indicators

Understanding the effect of organic pollutant fluoranthene on pea in vitro using cytokinins, ethylene, ethane and carbon dioxide as indicators

Patterns of cytokinins and leaf gas exchange among canopy layers of a mature sugar maple (Acer saccharum) stand

Ozone Stress and Ectomycorrhizal Root–Shoot Signaling

Contact Info

Product

Resources

About