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Download-PDF International Journal of Plant & Soil Science 31(5): 1-14, 2019; Article no.IJPSS.54302 ISSN: 2320-7035 Morphological and Structural Characterization of Rhizospheric Endomycorrhiza Communities Associated with Rice Grown in the Sahelian Zone (Chad) Yoradi Nadjilom1, Steve Takoukam Toukam1, Richard Tobolbaï1,2 and Albert Ngakou1* 1Department of Biological Sciences, Faculty of Science, University of Ngaoundere, P.O.Box 454, Ngaoundere, Cameroon. 2Department of Microbiology, Faculty of Science, University of Yaoundé 1, P.O.Box 812, Yaoundé, Cameroon. Authors’ contributions This work was carried out in collaboration among all authors. Author YN designed the study, performed the statistical analysis, wrote the protocol and wrote the first draft of the manuscript. Authors STT and AN managed the statistical analyses of the data. Author RT managed the literature searches. All authors read and approved the final manuscript. Article Information DOI: 10.9734/IJPSS/2019/v31i530222 Editor(s): (1) Dr. Muhammad Shehzad, Department of Agronomy, Faculty of Agriculture, The University of Poonch Rawalakot AJK, Pakistan. Reviewers: (1) Addam Kiari Saidou, Niger. (2) Douira Allal, Ibn Tofail Univeristy, Morocco. Complete Peer review History: http://www.sdiarticle4.com/review-history/54302 Received 25 November 2019 Accepted 29 January 2020 Original Research Article Published 06 February 2020 ABSTRACT In Chad, rice is grown for its starchy seeds or caryopses, but is also for consumption in the form of seeds pasta with soup. However, little or no work has been conducted in Chad to assess the composition of endomycorrhiza community inhabiting the plant rice rhizospheres. Hence, the main objective of this study was to investigate on native endomycorrhiza that are efficient to establish a symbiotic relationship with two rice varieties in the Sahelian zone in Chad. Two rice varieties were grown in a pot experiment on composite soils samples from Laï, Kelo, Kolobo and N’Djamena for 3 months. Parameters such as mycorrhizal frequency, intensity, specific density and richness were determined following to the standard methods. After spore extraction, species description and _____________________________________________________________________________________________________ *Corresponding author: E-mail: [email protected]; Nadjilom et al.; IJPSS, 31(5): 1-14, 2019; Article no.IJPSS.54302 characterization were obtained through the informations provided by the International Vesicular Mycorrhizal fungi collection (INVAM): http://invam.caf.wv.edu/fungi/taxonomy/species ID.htm. The highest specific endomycorrhizal density (97.3%) and richness (11%) were registered respectively at kelo, Laï and Kolobo. The endomycorrhizal frequency and intensity were respectively between 4.33-7.33% and 0.8-2.9% for the two rice varieties. Eleven endomycorrhiza species belonging to six genera were identified from different soil samples. These include Septoglomus (S. constrictum, S. deserticola); Rhizophagus (R. aggregatus, R. fasciculatus, R. intraradices); Acaulospora (A. lacunosa, A. rugosa, A. trappei); Claroideoglomus lamellosum; Glomus pansihalos and Diversispora epigae. S. constrictum was the most dominant and frequent species found in all the soil sampling sites, while R. aggregatus was the less frequently encountered specimen. The lowest macorrhizal richness and frequency obtained is a proof that cultivation of rice dependent on endomycorrhiza in this zone. The multi-native endomycorhiza spores identified are the active principle to be included in the bioinoculants production in order to increase and improve the production of rice in the south of Chad. Keywords: Chad; endomycorrhiza species; mycorrhizal intensity; mycorhizal frequency; rice varieties; specific richness; specific density. 1. INTRODUCTION conducted in Chad to assess the composition of endomycorrhiza community associated to rice. During the process of improving the living The main objective of this study was to conditions of populations, Chad is undertaking investigate on endomycorrhiza that are able to several development projects, including the one establish a symbiotic relationship with two rice concerning the improvement of rice production in varieties in the Sahelian zone in Chad. In short, the Tandjile, Mayo Kebbi and the two Logones the endomycorrhiza spores diversity and zones, with the aim of consolidating the food distribution within the rhizosphere of rice are to security [1]. Due to the low soil fertility, rice is be evaluated, as a step forward to the production usually grown in the aformentioned zones with of elite endomycorrhizal biofertilizers to boost the the addition of chemical fertilizers to balance the rice production in Chad. mineral balance and allow the plants to express their potentials, although this practice clearly 2. MATERIALS AND METHODS causes serious food and environmental risks of pollution [2]. 2.1 Description of Study Sites and the Experimental Set Up Sustainable agronomic research has shown that food production can be better conducted with Soils were sampled in the Tandjile regions technologies based on biological processes [3]. comprising Kelo (N 9º18'50.7''), Lai (N 9º23'24'’), Among these techniques, organic farming with Mayo-Kebbi (Kolobo): (N 9º54'18.2'') and the city the application of biofertilizers has been highly of N'Djamena (N 9º54'18.6''), as shown on Fig. 1 recommended [4-9]. In fact, endomycorrhiza Soils were collected within the 0-20 cm depth fungi are one group of the soil microorganisms, horizon in the five selected sites. In each site, which are generally involved in the improvement soils were collected at 5 different locations along of plant growth, as well as in their protection a transect at a rate of 10 kg per location, for a against plant pests and diseases [10]. They also total of 50 kg soil per site that was stored in 2 kg reduce environmental contamination by their plastic pots. ability to capture soil nutrients, causing a decrease in the use of chemical fertilizers while Fig. 2 summarizes the experimental design in a ensuring good crop yields [11]. Currently, it is random bloc A, B, C, D representing the soil estimated that 90% of cultivated plants are sampling sites, while at each site M (Maditolngar) associated to mycorrhiza [12]. and T (Tox 728-1) indicate the two rice varieties repeated each in twelve 2 kg plastic pots. In Chad, rice is grown for its starchy seeds or caryopses, but is also consumed in the form of 2.2 Determination of the Physico- seeds pasta with soup. Although some studies chemical Properties of Soils have been carried out in Cameroon on the diversity of mycorhiza associated to maize and Soils were analysed at the Chadian Institute for cowpea [13,14], little or no work has been Agronomic Research for Development (ITRAD) 2 Nadjilom et al.; IJPSS, 31(5): 1-14, 2019; Article no.IJPSS.54302 in N'djamena. The parameters analysed were: When choosing a test, the instrument Organic carbon (CO), organic matter (OM), automatically selects the parameters required hydrogen potential (pH), total nitrogen (N), for accurate analysis, including wave length available phosphorus (P) and available and reaction time. After the completion of potassium (K). Soil parameters were analysed the test, additional optional tests are by the PALINTEST Kit using a 5000 Direct available and the results can be converted into Water Reading Proof Spectrophotometer that different units, depending on the studied determines the soil physico-chemical properties. parameter. Fig. 1. Map of Chad showing the soil sampling study sites (in green) 3 Nadjilom et al.; IJPSS, 31(5): 1-14, 2019; Article no.IJPSS.54302 W M M M M M M M M M M M M A T T T T T T T T T T T T D T M M M M M M M M M M M M M T B M T T T T T T T T T T T T T M T M M M M M M M M M M M M M T M C T T T T T T T T T T T T T M T M T M T M T M T M T M E Fig. 2. Experimental layout of rice varieties in diferent soil types T: TOX 728-1; M: Madjitolngar; A: Laï soil (Tandjilé); B: N’Djaména soil (Chari Baguirmi); C: Kolobo soil (Mayo Kebbi); D: Kelo soil (Tandjilé) 2.3 Trapping of Endomycorrhizal Spores Neutralized roots were depth into cotton blue from Soil Samples under a water bath for 15 minutes, filtered again through a sieve and rinsed with distilled water. Endomycorrhizal spores inhabiting the Some roots were mounted in water for direct rhizosphere of rice plant were trapped according observations, while other were mounted in to the method described [15] and modified as glycerine for later observations. The estimation of follows: Local rice varieties Tox728-1 and mycorrhization parameters was evaluated as Madjitolngar seeds originated from the Malla previously described [17]. Agricultural Research station (Tandjile) were sown in twelve different pots, each containing 1 2.5 Evaluation of the Mycorrhizal kg of composite soil per site. Pots placed out of Frequency and Intensity in Rice Plant the contact with soil were watered with natural Roots rainfall for three months (July to September 2016). Plants roots at maturity and rhizospheric The frequency of mycorrhization F (%) was soils were sampled and preserved in the expressed as the percentage of colonization of refrigerator at 4ºC for laboratory analysis. the rice plant roots by arbuscular fungi as follow: 2.4 Determination of the Degree of F (%) = 100(N-N0)/N Mycorrhization in Infested Roots With N: The number of root fragments observed, Fine harvested rice roots were thinned through and N0 the number of non-mycorrhizal the method to assess endomycorrhizal fragments. infestation structures [16]. Youngest roots were cut into 1-2 cm length, before they were The intensity of mycorrhization was referred to as successfully washed, inserted into a test tube the degree of roots colonized by arbuscular fungi containing 10% potassium hydroxide, and heated and expressed as: in a water bath at 90ºC for 30 minutes to clear the roots.
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