Changes in levels of foliar carbohydrates and myo-inositol before premature leaf senescence of Populus nigra induced by a mixture of O3 and SO2

Fialho, Ricardo Cardoso; Bücker, J.

doi:10.1139/b96-120

Cited by 16 publications

(8 citation statements)

References 16 publications

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“…The effects of O 3 on foliar nonstructural carbohydrate concentrations were complicated. For example, the concentrations of non-structural carbohydrates in the leaves were found to be reduced by exposure to O 3 in Populus nigra, Picea abies and Pinus taeda (Meier et al 1990; Barnes et al 1995;Fialho and Bücker 1996), whereas the carbohydrate concentrations were increased or not affected by O 3 in Populus × euramericana, Pinus sylvestris and P. abies (Landolt et al 1994;Holopainen et al 1996;Utriainen and Holopainen 2000). In our previous studies, it was reported that net photosynthetic rate, starch grain size in chloroplasts and whole-plant dry mass of F. crenata seedlings were reduced by the exposure to O 3 (Yonekura et al 2001a, b).…”

Section: Discussionmentioning

confidence: 99%

Carry-over effects of ozone and water stress on leaf phenological characteristics and bud frost hardiness of Fagus crenata seedlings

Yonekura

Yoshidome

Watanabe

et al. 2004

Trees

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We examined the carry-over effects of ozone (O 3 ) and/or water stress on leaf phenological characteristics and bud frost hardiness of Fagus crenata seedlings.Three-year-old seedlings were exposed to charcoal-filtered air or 60 nl l −1 O 3 , 7 h a day, from May to October 1999 in naturally-lit growth chambers. Half of the seedlings in each gas treatment received 250 ml of water at 3-day intervals (well-watered treatment), while the rest received 175 ml of water at the same intervals (water-stressed treatment). All the seedlings were moved from the growth chambers to an experimental field on October 1999, and grown until April 2000 under field conditions. The exposure to O 3 during the growing season induced early leaf fall and reduction in leaf non-structural carbohydrates concentrations in the early autumn, as well as resulting in late bud break and reduction in the number of leaves per bud in the following spring. However, O 3 did not affect bud frost hardiness in the following winter. On the contrary, water stress did not affect leaf phenological characteristics, leaf and bud non-structural carbohydrates concentrations and bud frost hardiness. There were no significant synergistic or antagonistic effects of O 3 and water stress on leaf phenological characteristics, concentrations of leaf and bud non-structural carbohydrates and bud frost hardiness of the seedlings. These results show that the carry-over effects of O 3 can be found on the phenological characteristics and leaf non-structural carbohydrates concentrations, although there are almost no carry-over effects of water stress on phenological characteristics and winter hardiness of the seedlings.

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Section: Discussionmentioning

confidence: 99%

Carry-over effects of ozone and water stress on leaf phenological characteristics and bud frost hardiness of Fagus crenata seedlings

Yonekura

Yoshidome

Watanabe

et al. 2004

Trees

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“…RFO accumulation has been correlated with enhanced cold, heat and/or desiccation tolerance from algae to angiosperms ( Santarius 1973; Salerno and Pontis 1989; Hinesley et al 1992; Ashworth et al 1993; Wiemken and Ineichen 1993; Bachmann et al 1994). Additionally, RFOs correlate positively with needle longevity as well as ozone‐ and sulfide‐stress tolerance in conifers ( Mitcham‐Butler et al 1986; Fialho and Bücker 1996).…”

Section: Introductionmentioning

confidence: 99%

Soluble sugar content of white spruce (Picea glauca) seeds during and after germination

Downie

Bewley

2000

Physiologia Plantarum

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In white spruce (Picea glauca [Moench.] Voss.) seeds, the raffinose family oligosaccharides (RFOs) provide carbon reserves for the early stages of germination prior to radicle protrusion. Some seedlots contain seeds that are dormant, failing to complete germination under optimal conditions. Since dormancy may be imposed through a metabolic block in reserve mobilization, the goal of this project was to identify any impediment to RFO mobilization in dormant relative to nondormant seeds. Desiccated seeds contain primarily, and in order of abundance on a molar basis, sucrose and the first 3 members of the RFOs, raffinose, stachyose and verbascose. Upon radicle protrusion at 25°C, the contents of RFOs decreased to low amounts in all seed parts, regardless of prior dormancy status and sucrose was metabolized to glucose and fructose, which increased in seed parts. During moist chilling at 4°C, RFO content initially decreased before stabilizing and then increasing. In seeds that did not complete germination, the synthesis of RFOs at 4°C favored verbascose, so that at the end of 14 (nondormant) or 35 (dormant) weeks, verbascose contents in megagametophytes exceeded the amount initially present in the desiccated seed. This was also true in the embryos of the dormant seedlot. In seed parts from both seedlots after months of moist chilling, stachyose amounts exceeded raffinose amounts. Upon radicle protrusion at 4°C, RFO contents decreased to amounts most similar to those present in seeds that completed germination at 25°C. Hence, the RFOs are utilized as a source of energy, regardless of the temperature at which white spruce seeds complete germination. Based on the similarity of sugar contents in seed parts between dormant and nondormant seeds that did not complete germination, differences in sugar metabolism are probably not the basis of dormancy in white spruce seeds.

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“…So far, it has been reported that they are involved in raYnose oligosaccharide metabolism (Gao and SchaVer 1999;Smart and Pharr 1980), stress tolerance in plants (Pennycooke et al 2003;Taji et al 2002) as well as galactolipid degradation during plant senescence (Fialho and Bücher 1995;Thompson et al 1998).…”

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confidence: 99%

An α-galactosidase with an essential function during leaf development

Chrost

Kolukisaoglu

Schulz

et al. 2006

Planta

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The putative alpha-galactosidase gene HvSF11 of barley, previously shown to be expressed during dark induced senescence, is expressed in the growing/elongating zone of primary foliage leaves of barley. The amino acid sequence deduced from the full length HvSF11 cDNA contains a hydrophobic signal sequence at the N-terminus. Phylogenetic relationship of the HvSF11 encoded barley alpha-galactosidase to other alpha-galactosidases revealed high homology with the alpha-galactosidase encoded by the gene At5g08370 from Arabidopsis thaliana. We have isolated two independent heterozygous At5g08370 T-DNA insertion mutants from Arabidopsis thaliana, both of which have a higher number of rosette leaves with a curly surface leaf morphology and delayed flowering time in comparison to wildtype plants. Localization of the Arabidopsis alpha-galactosidase protein via GUS-tag revealed that the protein is associated with the cell wall. This result was confirmed by immunological detection of the orthologous barley protein in a protein fraction derived from cell walls of barley leaves. It is concluded that the alpha-galactosidase proteins from barley and Arabidopsis might fulfill an important role in leaf development by functioning in cell wall loosening and cell wall expansion.

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Changes in levels of foliar carbohydrates and myo-inositol before premature leaf senescence of Populus nigra induced by a mixture of O₃ and SO₂

Cited by 16 publications

References 16 publications

Carry-over effects of ozone and water stress on leaf phenological characteristics and bud frost hardiness of Fagus crenata seedlings

Carry-over effects of ozone and water stress on leaf phenological characteristics and bud frost hardiness of Fagus crenata seedlings

Soluble sugar content of white spruce (Picea glauca) seeds during and after germination

An α-galactosidase with an essential function during leaf development

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