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首页> 外文期刊>African Journal of Biotechnology >Germination, growth and physiological responses of Senegalia senegal (L.) Britton, Vachellia seyal (Delile) P. Hurter and Prosopis juliflora (Swartz) DC to salinity stress in greenhouse conditions
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Germination, growth and physiological responses of Senegalia senegal (L.) Britton, Vachellia seyal (Delile) P. Hurter and Prosopis juliflora (Swartz) DC to salinity stress in greenhouse conditions

机译：塞内加利亚塞内加尔（L.）布里顿（Britton），Vachellia seyal（Delile）P. Hurter和Prosopis juliflora（Swartz）DC在温室条件下对盐分胁迫的萌发，生长和生理响应

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Salinity is among the most widespread environmental threats to global plant production, especially in arid and semi-arid climates. Thus, the selection of salt tolerant species is necessary for sustainable plant productivity. The purpose of this study was to measure and understand the salt tolerance of three multipurpose trees used in reforestation programs in many Sahelian countries (Senegalia senegal, Syn. Acacia senegal; Vachellia seyal, Syn. A. seyal, and Prosopis juliflora). The effect of salinity was evaluated at seed germination stage on Petri dishes containing water agar (0.9%, w/v) with seven concentrations of NaCl (0, 86, 171, 257, 342, 428, and 514 mM). Our results showed that all the species had a germination rate higher than 85% at 257 mM. However, it decreased at 342 mM with a reduction of 70 and 20%, respectively for S. senegal and V. seyal. For plants growth and physiological responses, seedlings were individually cultivated in plastic bags (25×12 cm) containing non-sterile soil and watered with four salt solutions (0, 86, 171 and 257 mM NaCl). Four months after the plants’ cultivation, the results showed that for all species, the salinity reduced significantly the height, the collar diameter, the shoot and root dry biomass as well as the total chlorophyll, K+ and K+/Na+ ratio. In the meantime, proline content, Cl- and Na+ accumulation in leaves were increased. It was also found that S. senegal and V. seyal tolerated high concentrations of NaCl (257 mM) and developed physiological and molecular mechanisms, such as salt tolerance genes (NHX1), which allow them to be considered as moderated salt tolerant species and seemed to be potential species for the restoration of salt-affected land as P. juliflora.
机译：盐分是全球植物生产面临的最广泛的环境威胁之一，特别是在干旱和半干旱气候下。因此，选择耐盐物种对于可持续的植物生产力是必要的。这项研究的目的是测量和了解许多萨赫勒地区国家（造林塞内加利，塞内加尔塞内加尔，塞内加尔西卡纳西，塞西尔·塞萨尔·西雅尔和塞里索斯·朱利弗里拉的三棵多用途树）的耐盐性。在种子萌发阶段，在含有7种浓度的NaCl（0、86、171、257、342、428和514 mM）的水琼脂（0.9％，w / v）的陪替氏培养皿中评估盐度的影响。我们的结果表明，所有物种在257 mM处的发芽率均高于85％。但是，对于塞内加尔塞纳加尔和塞西尔沙伊尔，它在342 mM处减少了70％和20％。为了植物生长和生理反应，将幼苗分别种植在装有非无菌土壤的塑料袋（25×12厘米）中，并用四种盐溶液（0、86、171和257 mM NaCl）浇水。在植物种植四个月后，结果表明，所有物种的盐度都显着降低了其高度，衣领直径，枝条和根部干燥生物量以及总叶绿素，K +和K + / Na +比。同时，叶片中脯氨酸含量，Cl-和Na +积累增加。还发现塞内加尔和塞西尔纳菌能耐受高浓度的NaCl（257 mM），并发展了生理和分子机制，例如耐盐基因（NHX1），这使它们被认为是中度耐盐的物种，似乎是恢复盐碱地（P. juliflora）的潜在物种。

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