Abstract:
:Using Avena sativa L. cv. Victory oat seedlings and excised p-1 stem segments (including the p-1 and p-2 internodes) the effect of exogenously supplied ethylene and the removal of ethylene on internodal extension and gravitropic bending was assessed. Similarly, the ability of the excised system to respond to gravistimulation was assessed in the presence of inhibitors of ethylene action (AgNO3) and ethylene synthesis (3,5-diiodo-4-hydroxybenzoic acid and benzyl isothiocyanate; BITC). The production of ethylene from both intact and excised systems was also measured from 0 to 48 h after gravistimulation, relative to vertical controls. Although gravitropic curvature is initiated, and indeed enters the most rapid phase of upward bending during the first 6 h, there is no difference in ethylene production between vertical and geostimulated plants during this period. The ethylene production of gravistimulated plants rises sharply to a maximum at 24 h, then decreases steeply to almost the control level by 48 h, at which time the rate of upward curvature is diminishing. Neither the addition nor removal of ethylene, nor the addition of inhibitors affecting ethylene-action (AgNO3) or synthesis (DIHB) influence gravitropic bending or internodal extension in excised segments. Although the ethylene synthesis inhibitor BITC slowed down the rate of upward bending, this effect could not be reversed by addition of ethylene. We conclude that the burst in ethylene production that develops in leaf-sheath bases (pulvini) after they have started to curve upwards is not primary to the induction of curvature. We further suggest that ethylene has no major effect or role in the induction of upward bending after gravistimulation. The metabolism of high specific activity gibberellin A1 ([3H]-GA1) in the excised system was assessed during 1, 2 and 4 h of gravistimulation. Changes in endogenous GAs and GA metabolism have been shown previously to be correlated (at the later stages) with gravistimulated bending in intact Avena shoots. The excised segments "leaked" free [3H]-GAs and [3H]-GA glucosyl conjugate-like substances into the bathing medium, and this was a confounding factor. Nevertheless, gravistimulated stem segments, and especially the bottom half of the segment, were significantly less leaky then vertical segments. Thus, just 1 h after gravistimulation, bottom segment halves retained 22% more precursor [3H]-GA1, 36% more free [3H]-GA-like metabolites, and 48% more [3H]-GA glucosyl conjugate-like metabolites than vertical segments. In contrast, the 1 h gravistimulated top halves retained slightly less (1-4%) precursor [3H]-GA1 and free [3H]-GA metabolites, but 21% more [3H]-GA glucosyl conjugate-like radioactivity than vertical segments.
journal_name
Physiol Plantjournal_title
Physiologia plantarumauthors
Kaufman P,Pharis RP,Reid DM,Beall FDdoi
10.1111/j.1399-3054.1985.tb02389.xsubject
Has Abstractpub_date
1985-01-01 00:00:00pages
237-44eissn
0031-9317issn
1399-3054journal_volume
65pub_type
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journal_title:Physiologia plantarum
pub_type: 杂志文章
doi:10.1034/j.1399-3054.2001.1120407.x
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journal_title:Physiologia plantarum
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pub_type: 杂志文章
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pub_type: 杂志文章
doi:10.1111/j.1399-3054.2007.00991.x
更新日期:2008-01-01 00:00:00
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journal_title:Physiologia plantarum
pub_type: 杂志文章,评审
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更新日期:2014-06-01 00:00:00
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journal_title:Physiologia plantarum
pub_type: 杂志文章,评审
doi:10.1111/j.1399-3054.2008.01067.x
更新日期:2008-08-01 00:00:00
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pub_type: 杂志文章
doi:10.1111/ppl.12739
更新日期:2019-03-01 00:00:00
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journal_title:Physiologia plantarum
pub_type: 杂志文章
doi:10.1111/j.1399-3054.1990.tb00045.x
更新日期:1990-08-01 00:00:00
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doi:10.1111/ppl.13112
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pub_type: 杂志文章
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journal_title:Physiologia plantarum
pub_type: 杂志文章
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更新日期:2001-05-01 00:00:00
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journal_title:Physiologia plantarum
pub_type: 杂志文章
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journal_title:Physiologia plantarum
pub_type: 杂志文章
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journal_title:Physiologia plantarum
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pub_type: 杂志文章
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journal_title:Physiologia plantarum
pub_type: 杂志文章
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journal_title:Physiologia plantarum
pub_type: 杂志文章
doi:10.1034/j.1399-3054.1999.105418.x
更新日期:1999-04-01 00:00:00
abstract::Uracil-DNA glycosylase (UDG) is the first enzyme in the base excision repair pathway for removal of uracil in DNA. DNA repair capacity is likely to be a critical factor in mutagenesis and thereby in the capacity to prevent genetic damage and unwanted variation. We have studied expression of UDG in 9 higher plant speci...
journal_title:Physiologia plantarum
pub_type: 杂志文章
doi:10.1111/j.1399-3054.1993.tb01389.x
更新日期:1993-08-01 00:00:00