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がん種類別・ステージ別 5年生存率の詳細データ (NHK)

国立がん研究センターが発表した、5年生存率のがんの種類・ステージ別のデータは以下のとおりです。全体の生存率が高い順に示します。 前立腺がん ▽ステージ1=100...

  1. がん 5年生存率 全体で66.4% 最高...
  2. 首位アジルバがオルメテックを大きく突き放...
  3. 【動画】この薬を食前に飲んで下さい。 (...
  4. 遺伝性乳がん 予防切除、保険適用 中医協...

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The harsh life of an urban tree: the effect of a single pulse of ozone in salt-stressed Quercus ilex saplings.

著者 Guidi L , Remorini D , Cotrozzi L , Giordani T , Lorenzini G , Massai R , Nali C , Natali L , Pellegrini E , Trivellini A , Vangelisti A , Vernieri P , Landi M
Tree Physiol.2016 Oct 26 ; ():.
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Ozone (O3) and salinity are usually tested as combined factors on plant performance. However, the response to a single episode of O3 in plants already stressed by an excess of NaCl as occurs in the natural environment has never been investigated, but is important given that it is commonly experienced in Mediterranean areas. Three-year-old Quercus ilex L. (holm oak) saplings were exposed to salinity (150 mM NaCl, 15 days), and the effect on photosynthesis, hydric relations and ion partitioning was evaluated (Experiment I). In Experiment II, salt-treated saplings were exposed to 80 nl l(-1) of O3 for 5 h, which is a realistic dose in a Mediterranean environment. Gas exchanges, chlorophyll fluorescence and antioxidant systems were characterized to test whether the salt-induced stomatal closure limited O3 uptake and stress or whether the pollutant represents an additional stressor for plants. Salt-dependent stomatal closure depressed the photosynthetic process (-71.6% of light-saturated rate of photosynthesis (A380)) and strongly enhanced the dissipation of energy via the xanthophyll cycle. However, salt-treated plants had higher values of net assimilation rate/stomatal conductance (A/gs) than the controls, which was attributable to a greater mesophyll conductance gm/gs and carboxylation efficiency (higher gm/maximal rate of Rubisco carboxylation (Vcmax)), thus suggesting no damage to chloroplasts. O3 did not exacerbate the effect of salinity on photosynthesis, however a general enhancement of the Halliwell-Asada cycle was necessary to counteract the O3-triggered oxidative stress. Despite the 79.4% gs reduction in salt-stressed plants, which strongly limited the O3 uptake, a single peak in the air pollutant led to an additional burden for the antioxidant system when plants had been previously subjected to salinity.
PMID: 27784826 [PubMed - as supplied by publisher]
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