Seasonal Changes in Growth and their Relations with Overwintering in Six Varieties of Panicum

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  • パニカム属6品種における生育の季節的変化と越冬性との関係
  • Seasonal Changes in Growth and their Re

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Abstract

The growth characteristics before winter and their relations to overwintering were investigated from July, 1995 to May, 1996, using 6 varieties in Panicum maximum and P. coloratum grown in the field, for clarifying their variations in cold-tolerance and assisting genetic improvement for overwintering ability. Before winter, there were quite different changes among 6 varieties in the total number of living tillers, which increased steadily in Makarikari, while decreased gradually in the others of P. coloratum, i.e. Tayutaka and Tamidori, and did rapidly in 3 varieties of P. maximum, i.e. Natsukaze, Green panic and Gatton. The number of living vegetative tillers (VTs) was the highest and the percentage of number of reproductive tillers to the total number of living tillers (Prt) was the lowest in Makarikari. Percentage of regrown plants, i.e. the percentage of the number of plants with new regrown tiller (s) to all of the plants in spring (PRplant) was the highest in Makarikari, followed by Tayutaka, Gatton and Green panic and nil in Natsukaze and Tamidori. The PRplant was correlated positively with the number of VTs and negatively with the Prt from late October to late December, but was not significantly correlated with plant dry weight. In conclusion, the variety with a high overwintering ability in the genus Panicum has the characteristics of the greater number of VTs before winter, and has the higher ratio of living tiller buds on VTs.

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