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Bouchenafa Nadia

  • Biodiversity Journal, 13 (2): 0373-0380

    Kawther Abdelhamid, Nadia Bouchenafa, Khalladi Mederbal & Fatima Dahlia
    Assessment of morphological variability of leaves and fruits of three natural populations of wild caper (Capparis spinosa L.) in western Algeria
    https://doi.org/10.31396/Biodiv.Jour.2022.13.2.373.380

    ABSTRACT
    Capparis spinosa L., family Capparidaceae, is a spontaneous plant of great economic, medicinal and ecological importance. This study focused on the estimation of morphological variability of three populations of the spiny caper from western Algeria by measuring morphological traits of leaves, fruits and seeds. Variance analysis showed that there were significant (P<0.05) difference (number of seeds per fruit) to highly significant (P<0.001) difference (the other morphological traits) between the three spontaneous caper natural populations with coefficients of variation ranging from 6.39% to 24.11%. There were no interpopulation differences for fruit width (P>0.05). The populations of Taghit (Bechar) and Sidi Belattar (Mostaganem) showed the best morphological traits. The population from Taghit had the best means for leaf length (35.62±3.47 mm), fruit width (35.62±3.47 mm), fruit weight (11.06±2.74 g), peduncle length (79.55±12.26 mm) and number of seeds per fruit (157±40.20). The population from Sidi Belattar was characterized by the highest leaf widths (39.24±3.89 mm), petiole lengths (11.309±2.02 mm), fruit lengths (42.433±4.15 mm), seed lengths (3.46±0.20 mm) and thousand seed weights (12.15±1.75 g). While the population from Mghila (Tiaret) had the lowest means for most morphological traits. Principal component analysis (PCA) showed a geographical separation between the studied populations with a polymorphism of 83.31%. The hierarchical classification using Ward’s distance classified the populations into two clusters related to climatic and edaphic gradients.

  • Biodiversity Journal, 11 (4): 1031-1036

    Labdelli Fatiha, Bousmaha Fatma, Adamou Djerbaoui Malika, Bouchenafa Nadia, Oulbachir Karima & Laouidj Aicha
    Impact of Nematode Heterodera avenae Wollenwebwer, 1924 (Heteroderidae) attack on cereal yields in the region of Tiaret (Algeria)
    https://doi.org/10.31396/Biodiv.Jour.2020.11.4.1031.1036

    ABSTRACT
    The cyst nematode Heterodera avenae Wollenweber, 1924 (Heteroderidae) is an obligate endoparasite of grasses. It is the most studied and most damaging nematode known for more than a century. The study of the distribution of the H. avenae cyst nematode was carried out on some plots of cereal-oriented municipalities in the Tiaret region to assess the infestation levels of the plots in order to study the impact of the nematode infestation on cereal yields. Spearman’s test was used, which allowed us to study the correlation between the degree of infestation and cereal yields, particularly wheat, barley and oats. The plots of the communes surveyed are all infested by H. avenae with different levels of infestation except the plots of the town of Sebaine and Mahdia where the infestation is practically non-existent (0 cysts/100 g of soil). The correlation is negative between the degree of infestation and the yield (r = -0.06), the yields of hard wheat are low when the degree of infestation is high. Soft wheat and barley yields are negatively correlated with respectively, r = - 0.26 and r = -0.27, therefore, heavy infestations of the nematode lead to a decrease in yield. Unlike other cereal species, the correlation is positive with the degree of infestation (r = 0.18), so the infestation of the nematode did not greatly influence oat yields. Oats are a tolerant species for nematode attack in relation to wheat and barley that have recorded decreases in yields. Unlike the three previous crop types, oats stand out for their tolerance to this parasite.