Journal of Food, Agriculture and Environment
Vol 7,
Issue 3&4,2009
Online ISSN: 1459-0263
Print ISSN: 1459-0255
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Assessment of Tunisian Trigonella foenum-graecum diversity using physiological parameters
Author(s):
Nidhal Marzougui 1*,
Ferdaous Guasmi 1, Anissa Boubaya 1, Walid Elfalleh 1, Belgacem Lachieheb 1, Ali Ferchichi 1, Mohamed Beji 2Recieved Date: 2009-05-05, Accepted Date: 2009-09-28
Abstract:The species Trigonella foenum-graecum, wild or cultivated, is widely distributed throughout the world. This work aims to analyse the structure of thirty eight T. foenum-graecum cultivars selected from different Tunisian bioclimatic stages using physiological parameters. Cultivars were collected from upper-semi arid, sub humid and lower arid Tunisian bioclimatic stages. The physiological traits were measured using the portable apparatus LCi linked to a gas analyzer infrared (IRGA) and a data logger. A variance analysis was assured with SPSS 16.0. Cultivars classification was obtained after the calculation of Mahalanobis distances between the pairs of cultivars by XlStat software. A principal compound analysis was effectuated by StatBox software to verify the dendrogram clustering. Results showed significant variations in physiological traits between the studied cultivars. Dendrogram analysis revealed four clusters. The first cluster had photosynthesis rate from 12.74 to 19.83 μmol/m2/s, stomatal conductance from 0.14 to 0.31 mol/m2/s, mesophyll conductance from 6.6 to 18.8 mmol/m2/s and transpiration rate from 2.61 to 3.83 mol/m2/s. The second one presented a photosynthesis rate from 10.23 to 18.33 μmol/m2/s, stomatal conductance from 0.18 to 0.43 mol/m2/s, mesophyll conductance from 7.6 to 12.2 mmol/m2/s and transpiration rate from 3.16 to 4.06 mol/m2/s. The third cluster reached Am from 11.19 to 17.98 μmol/m2/s, gs from 0.15 to 0.25 mol/m2/s, mc from 4.7 to 6.6 mmol/m2/s and E from 2.58 to 3.93 mol/m2/s. The last cluster had Am from 11.42 to 18.11 μmol/m2/s, gs from 1.67 to 3.27 mol/m2/s, mc from 1.01 to 14 mmol/m2/s and E from 2.97 to 4.72 mol/m2/s. Principal components analysis confirmed this clustering and showed the same four clusters that were obtained by the dendrogram. Significant correlation between Mahalanobis distances matrix and geographic distances matrix was revealed by the test of Mantel (r = -0.08; p = 0.02 < 0.05).
Keywords:Trigonella foenum-graecum,
diversity, Tunisia, photosynthesis rate, stomatal conductance, mesophyll conductance, transpiration rate, classification, PCA, test of MantelJournal: Journal of Food, Agriculture and Environment
Year: 2009
Volume: 7
Issue: 3&4
Category: Agriculture
Pages: 427-431
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