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2013 | 35 | 07 |
Tytuł artykułu

Water stress impact on young seedling growth of Acacia arabica

Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
Drought is the major constraint in arid regions throughout the world and identification of drought-resistant plants is therefore of crucial importance. Since young seedling stage is especially sensitive to water stress, the present work analyzed the physiological behavior of seedling from Acacia arabica issued from a dry area, grown under controlled environmental conditions and subjected to progressive soil drying. Although soil gravimetric water content (g H2O g-1 soil dry weight) dropped from 80 % to less than 35 %, most plants remained alive until the end of the water stress. Seedlings were able to efficiently close their stomata to reduce water losses and accumulated high amounts of proline. Despite osmotic adjustment, turgor pressure decreased in stressed plants and could explain the stress-induced inhibition of plant growth. Decrease in net photosynthesis was related to stressinduced decrease in stomatal conductance and not to any impact on chlorophyll concentration or fluorescence-related parameter: both PSII efficiency and photochemical quenching remained unaffected by water stress while drought-induced increase in non-photochemical quenching should be regarded as a strategy to avoid over-energisation of the photosynthetic apparatus. Instantaneous water use efficiency increased in stressed plants comparative to controls. Oxidative stress estimated by malondialdehyde concentration was recorded only at the end of the treatment, suggesting that stressed plants remained able to cope with reactive oxygen species. Water stress induced an increase in anthocyanins, while aglycone flavonols decreased. Those compounds were not involved in the management of oxidative stress. It is concluded that A. arabica is a promising drought-resistant plant species for rehabilitation of dry areas.
Słowa kluczowe
Wydawca
-
Rocznik
Tom
35
Numer
07
Opis fizyczny
p.2157-2169,fig.,ref.
Twórcy
autor
  • E ´ cole Nationale Supe´rieure d’Agronomie (ENSA), Avenue Hassan Badi, El Harrach, Algiers 16200, Algeria
  • Faculte´ des Sciences Biologiques (FSB), E ´ quipe de Physiologie Ve´ge´tale/Laboratoire de Biologie et Physiologie des Organismes (LBPO), Universite´ des Sciences et de la Technologie Houari Boumediene (USTHB), BP 32, El Alia, Bab Ezzouar, 16111 Algiers, Algeria
  • Groupe de Recherche en Physiologie ve´ge´tale (GRPV), Earth and Life Institute-Agronomy (ELI-A), Universite´ Catholique de Louvain, 5 (L7.07.13) Place Croix du Sud, 1348 Louvain-la-Neuve, Belgium
autor
  • Faculte´ des Sciences Biologiques (FSB), E ´ quipe de Physiologie Ve´ge´tale/Laboratoire de Biologie et Physiologie des Organismes (LBPO), Universite´ des Sciences et de la Technologie Houari Boumediene (USTHB), BP 32, El Alia, Bab Ezzouar, 16111 Algiers, Algeria
autor
  • Groupe de Recherche en Physiologie ve´ge´tale (GRPV), Earth and Life Institute-Agronomy (ELI-A), Universite´ Catholique de Louvain, 5 (L7.07.13) Place Croix du Sud, 1348 Louvain-la-Neuve, Belgium
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Uwagi
rekord w opracowaniu
Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.agro-a741bc20-24bf-4abe-a92b-4a619397c6c5
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