Seed viability and optimal germination conditions of Cedrus atlantica (Manetti ex Endl.) Carrière
Author:
Hafidou Nesrine1, Mehdadi Zoheir1, Latreche Ali1, Dadach Mohammed2, Bouchaour Ibrahim3
Affiliation:
1. Laboratory of Plant Biodiversity: Conservation and Valorization, Faculty of Natural Sciences and Life , Djillali Liabes University , BP 89 , Sidi Bel Abbes , Algeria 2. Bejaia University , Faculty of Natural and Life Sciences, Ecology and Environment Research Laboratory , Targua Ouzemour Road , Bejaia , Algeria 3. Academy of Créteil , 4 Rue Georges Enesco , Créteil , France
Abstract
Abstract
Our work is part of the ex situ conservation of the Atlas cedar (Cedrus atlantica (Manetti ex Endl.) Carrière), a threatened and endemic Pinaceae of the Maghreb. Our objectives are to evaluate the viability of seeds from three Algerian cedar groves ecotypes (Thienet El Had, Chelia, Chrea) by the 2,3,5 triphenyltetrazolium chloride (TZ) test and to elucidate the effect of continuous temperatures (15°C, 20°C, 25°C) on their germinative capacity. Moreover, the effects of some physicochemical pretreatments in breaking dormancy and improving germinability were estimated on the seeds of the cedar grove of Thienet El Had. In addition, in the same ecotype, the water stress, as simulated by using the PEG6000 (0 to −2.20 bar), was induced upon seed germination. Results of the TZ test showed variability in seeds’ viability among the three ecotypes with rates of 60, 85 and 90% in those of Chelia, Chrea and Thienet El Had, respectively. However, germination tests revealed the existence of partial dormancy in all tested seeds. Dramatic differences in the degree of dormancy were noted among the three provenances investigated. Untreated seeds of the three ecotypes exhibited maximum germination at 20°C: Thienet El Had (52%), Chelia (32%) and Chrea (7%). The final germination percentage was as high as 76% in seeds soaked in hot water (80°C) for 5 min followed by 56% in seeds treated with GA3 (150 ppm). The increase in water stress regularly decreases germination with a tolerance threshold corresponding to −2.2 bar.
Publisher
Walter de Gruyter GmbH
Reference61 articles.
1. Abel-Schaad, D., Iriarte, E., López-Sáez, J.-A., Pérez-Díaz, S., Sabariego Ruiz, S., Cheddadi, R., Alba-Sánchez, F. 2018. Are Cedrus atlantica forests in the Rif Mountains of Morocco heading towards local extinction? – The Holocene, 28(6), 1023–1037. 2. Addar, A., Khedache Z., Righi, H., Dahmani-Megrerouche, M. 2016. Monitoring the early stages of Cedar natural regeneration in some stations of Chréa Forest (Blidean Atlas, Algeria). (Suivi de la régénération naturelle du Cèdre de l’Atlas dans les premiers stades de développement dans quelques stations du massif forestier de Chréa (Atlas Blidéen, Algérie)). – Revue d’Ecologie (Terre et Vie), 71(4), 367–384. (In French with English summary). 3. Arar, A., Nouidjem, Y., Bounar, R., Tabet, S., Kouba, Y. 2020. Modeling of the current and future potential distribution of Atlas cedar (Cedrus atlantica) forests revealed shifts in the latitudinal, longitudinal and altitudinal range towards more humid conditions. – Ecological Questions, 31(3), 49–61. 4. Arjouni, Y., El Alaoui El Fels, M.A., El Mercht, S., Abou Sy, A., El Wahidi, F., Romane, A., Roques, A., Yart, A. 2013. Contribution to the improvement of germination among a forest endemic of Morocco, the Atlas cypress. (Contribution à l’amélioration de la germination chez une endémique forestière du Maroc, le cyprès de l’Atlas). – Ecologia Mediterranea, 39(1), 201–208. (In French with English summary). 5. Aydin, I., Uzun, F. 2001. Effects of some applications on germination rate of Gelemen clover seeds gathered from natural vegetation in Samsun. – Pakistan Journal of Biological Sciences, 4(2), 181–183.
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