Response of cassava ( Manihot esculenta Crantz) genotypes to natural infestation by scale insect pest Stictococcus vayssierei Richard (Hemiptera: Stictococcidae).

Autor:	Ngatsi PZ; Department of Plant Biology, Laboratory of Biotechnologies and Environment, Phytopathology and Plant Protection Unit, Faculty of Science, University of Yaounde 1, Yaounde, Cameroon., Ndongo B; Department of Plant Biology, Laboratory of Biotechnologies and Environment, Phytopathology and Plant Protection Unit, Faculty of Science, University of Yaounde 1, Yaounde, Cameroon., Ambang Z; Department of Plant Biology, Laboratory of Biotechnologies and Environment, Phytopathology and Plant Protection Unit, Faculty of Science, University of Yaounde 1, Yaounde, Cameroon., Eke P; Department of Biochemistry, Laboratory for Phytobiochemistry and Medicinal Plants Studies, Antimicrobial and Biocontrol Agents Unit, Faculty of Science, University of Yaounde 1, Yaounde, Cameroon.; Department of Crop Production Technology, College of Technology, University of Bamenda, Cameroon., Kuate WNT; Department of Plant Biology, Laboratory of Biotechnologies and Environment, Phytopathology and Plant Protection Unit, Faculty of Science, University of Yaounde 1, Yaounde, Cameroon., Dida SLL; Department of Plant Biology, Laboratory of Biotechnologies and Environment, Phytopathology and Plant Protection Unit, Faculty of Science, University of Yaounde 1, Yaounde, Cameroon., Manga JN; Department of Plant Biology, Laboratory of Biotechnologies and Environment, Phytopathology and Plant Protection Unit, Faculty of Science, University of Yaounde 1, Yaounde, Cameroon., Djiéto-Lordon C; Department of Animal Biology and Physiology, Laboratory of Zoology, Faculty of Science, University of Yaounde 1, Yaounde, Cameroon.
Jazyk:	angličtina
Zdroj:	Current research in insect science [Curr Res Insect Sci] 2024 Jan 14; Vol. 5, pp. 100071. Date of Electronic Publication: 2024 Jan 14 (Print Publication: 2024).
DOI:	10.1016/j.cris.2024.100071
Abstrakt:	Cassava is mostly grown for its starchy roots, which ensure food security. However, it is heavily attacked by the African root and tuber scale (ARTS) Stictococcus vayssierei in Central Africa. This pest is a severe constraint to the production of cassava, food and income security for smallholder farmers. Crop resistance development through the selection of varieties with resistant traits against targeted pests is a promising approach to pest control. This study investigated cassava genotypes' response to natural infestation and determined their resistance levels against S. vayssierei. Six cassava genotypes (two local and four improved) were planted in a completely randomized block design with four replicates. Agronomic parameters and ARTS density were evaluated at 3, 6, 9 and 12 months after planting (MAP). Biochemical content was determined on the pith and cortex of 12 MAP aged tuberous roots. As a result, the improved Excel variety recorded the highest scale density per plant with 102.83 ± 4.14 ARTS/P at 9 MAP. At 12 MAP, high activity of total cyanide (69.18 ± 0.88 and 69.16 ± 1.44 mg/kg) and phenylalanine ammonia-lyase (0.142 ± 0.020 and 0.145 ± 0.010 ΔA/min/mg) were observed in the cortex of the tuberous roots of the improved varieties TMS 96/0023 and TMS 92/0057 which were colonized by the lowest ARTS density. The local variety (Douma) had a high content of total phenols (44.87 ± 1.15 µg/g) in the pith. It also produced the highest yield (23.8 ± 2.9 t ha-1). Varieties TMS 96/0023, TMS 92/0057 and Douma may be the most suitable varieties for the control of ARTS stress. Competing Interests: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. (© 2024 Published by Elsevier B.V.)
Databáze:	MEDLINE
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