Morfogênese de cultivares de Panicum maximum jacq.

By C. A. D. M. Gomide, J. A. Gomide. 2000

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Four cultivars of Panicum maximum: Mombaca, Tanzânia, Centenario and Vencedor were grown in pots, under a transparent plastic cover, to evaluate the dynamic of leaf and tillers growth. Two growths, the establishment and the aftermath, after clipping at the age of 21 days, and two types of tiller, main and primary tillers, were studied. A completely randomized design with four replicates was used to compare the treatments resulting from a 4 x 2 x 2 factorial arrangement. The leaf blade length increased with insertion level until leaf number nine or ten, decreasing subsequently. The tillering process began during the second week of growth and continued until the 22nd day, when the number of tillers per plant stabilized. Tanzânia tillered the most (15 tillers/plant) while Mombaca and Vencedor tillered the least (10 tillers/plant). Higher leaf appearance and elongation rates were observed in the establishment growth. In either growth, the cultivar Vencedor showed the highest leaf appearance rate. In the aftermath growth, the number of green leaves per tiller stabilized at 6.5 for Vencedor and 3.5 for the remaining cultivars. In this growth the leaf life span ranged from 29 days, for the cultivar Centenario, to 36 days, for the remaining cultivars.

Subfields: Environmental Chemistry, Plant Science, Soil Science

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