Morphological characterization of Elephant grass (Pennisetum purpureum Schumach) ecotypes collected in Chiapas, Mexico

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LUIS ANTONIO GALVEZ MARROQUIN
JOSE DE JESUS MALDONADO MENDEZ https://orcid.org/0000-0002-1637-1645
CANDIDO ENRIQUE https://orcid.org/0000-0001-9943-0032
CARLOS HUGO https://orcid.org/0000-0003-3591-2280
RAFAEL https://orcid.org/0000-0001-5764-2723

Keywords

tropical grasses, livestock, feeding.

Resumen

Objective: To characterize the morphology of 18 ecotypes of Elephant grass (Pennisetum purpureum Schumach) in Chiapas. Design/Methodology/Approach: The morphological characterization was carried out with 34 quantitative and qualitative descriptors. A principal component analysis and a hierarchical cluster analysis were performed based on the average data. Results: In the principal component analysis, five of the principal components accounted for 70.7% of the total variability in the 18 ecotypes of Elephant grass. The variables that made the most significant contributions in each CP were: in CP1, internode diameter (p<0.01), internode length (p<0.05), color of internode without wax (p<0.01), number of innovations (p<0.01 ), prophylls (p<0.01), number of prophylls (p<0.01), external length of the sheath (p<0.01), internal length of the sheath at its opening point (p<0.01), opening of the auricle (p<0.01 ); for CP2, the number of visible internodes (p<0.05), channel width (p<0.05), size of innovations (p<0.05), adventitious root, number of internodes (p<0.01), wax under the sheath (p<0.05); and for CP3, number of visible internodes (p<0.05), color of the internode with wax (p<0.001), channel depth (p<0.001), ligule shape (p<0.05) and leaflet tip (p< 0.05). As a result of the hierarchical cluster analysis and the semipartial correlation coefficient, five morphologically distinct groups were determined.


Study Limitations: A more accurate description of the morphological diversity of the grasses requires the characterization of the inflorescence and the spikelet.


Findings/Conclusions: The 18 ecotypes of the Elephant grass (Pennisetum purpureum Schumach) collected and characterized were dissimilar with each other; consequently, they are considered a genetic resource with potential importance as forage on the Chiapas coast.

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