| Sumario: | Understanding the mechanisms by which some C4 grasses grow more than others
at moderately low temperatures (~12-20°C) is valuable to select materials to lengthen
the growing season. In turn, the determination of leaf lifespan for each material to be
used is relevant to optimize the balance between herbage production and herbage utilization.
The objectives of this study were to analyze the growth capacity and the leaf
lifespan in two native materials (Pappophorum caespitosum and Trichloris crinita) and in
four materials introduced (Cenchrus ciliaris cv. 'Texas-4464', Cenchrus ciliaris cv. 'Bella',
Panicum coloratum cv. 'Klein' and Panicum maximum cv. 'Gatton Panic') commonly used
in Argentina. Under non-limiting growth conditions, the rate of leaf appearance and leaf
elongation, the number of growing leaves and the leaf lifespan, were measured. The
materials showed similar leaf growth capacity through contrasting mechanisms: while
three of them (P. coloratum, P. maximum and P. caespitosum) showed higher growth of
individual leaves, the rest (C. ciliaris cv. 'Texas-4464', C. ciliaris cv. 'Bella' and T. crinita)
showed higher number of growing leaves. The leaf lifespan was not significantly different
between materials evaluated. Interestingly, in agreement with previous results obtained
in a comparison of C3 grasses, it was observed that materials possessing a greater
number of growing leaves had lower values of leaf lifespan.
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