Tests to evaluate the physiological potential of Mombasa grass seeds

Resumo

Identifying fast and efficient tests to evaluate the vigor of forage grass seed lots is desirable in the quality
control programs of the companies in this sector. Thus, the objective was to evaluate the efficiency of vigor tests on
the physiological quality of seeds of Panicum maximum, cv. Mombasa, for the differentiation of lots and prediction
of seedling emergence in the field. Nineteen seed lots were subjected to evaluations of moisture content, germination,
first count, germination speed index, seedling emergence in sand, first count of seedling emergence in sand, seedling
root and shoot lengths, seedling emergence in the field and computerized analysis of seedling images obtained through
SVIS®
software. The experimental design was completely randomized for the tests performed in the laboratory and
randomized blocks for the emergence test in the field. The data were subjected to analysis of variance and the means
were compared by Scott-Knott test at 5% probability level. Cluster analysis of seed lots and principal component
analysis were performed. The uniformity index, evaluated by image analysis and by the root length test, is efficient in
evaluating the physiological potential of seeds of Panicum maximum, cv. Mombasa, providing information similar to
those obtained with the test of seedling emergence in the field.