In light of the importance of seeds germinative phase in the progress of later stages of development of any particular plant species in semi-arid and arid area, it is essential to study the germinative behavior and to evaluate the tolerance of a perennial halophyte of Amaranthacaea family, Arthrocnemum glaucum (Del.) Ung. during this crucial phase. A study is devoted to this species seeds germination, which although it's a mandatory halophyte, it's less tolerant to salt stress in germination' phase. Germinative tests are carried out in laboratory, on seeds putted in Petri dishes placed at different temperatures. They enable us to determine the optimal germination temperature, which is 40˚C while the cold one (5˚C) completely inhibits it. The seeds of Arthrocnemum glaucum show an optimum germination of 44% in distilled water (NaCl 0 mm) similar to glycophytes but they differ in their ability to germinate at higher salinities. Beyond 300 mM germination is completely inhibited. Prior to break dormancy seeds, a cold treatment at 5˚C has been achieved; the germination capacity of the seeds increases with the duration of the cold treatment. It increases from 30% after 2 weeks of treatment to 80% after a treatment of 27 weeks.
The nuisance situation, generated by Culex pipiens, is strongly felt in Tlemcen. The difficult-to-control extension of urban planning and the faulty sewage and sanitation system are generators of cottages in Culex pipiens. To define areas infested with Culex pipiens, survey methods are an indispensable tool to address certain territorial problems (Metelo et al., 2013). Thus carrying out a survey of households in three municipalities located in the wilaya of Tlemcen in Algeria (Tlemcen, Chetouane and Mansourah). The purpose of the survey was to assess the degree of nuisance caused by Culex pipiens on populations. The results of the survey conducted in the Large Tlemcen grouping helped to define the aggressiveness of Culex pipiens and thus to establish a mapping of the infested areas.
This study is focused on the impact of climate change on the procession of floristic Globularia alypum L.qui Is well presented in the rocky areas. The impact of the drought on the plant formations is reflected by the desertification of the massive pre-forest, the extension of situations in desert areas of bioclimatic limits is based on the changes and thermal water. Under this constant pressure, forests tend to be transformed into matorral. These are sparse and destroyed in their turn to yield to the thorny species and/or toxic. On the whole of the Monts of Tlemcen, it is found that the degradation of Pistacio-Rhamnetalia Alaterni promotes the installation of matorrals pertaining to the class of Ononido-Rosmarinetea or Cisto-Lavanduletea depending on the nature of the substrate. The degradation of the formations to Cisto-Lavanduletea and Ononido-Rosmarinetea cause a change in the procession and floristic has their towers are replaced by other formations more adapted to these environments generally refer to the class of Thero-Brachypodietea which are generally species therophytiques has rapid growth.
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