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Germination Rate and Growth Characteristics of Blue Panicgrass¹

Genotypes of blue panicgrass (Panicum antidotale Retz.) previously selected for extremes of fast and slow rate of germination were evaluated for plant growth characteristics. Germination rate and growth characteristics were predictive indicators of the success of plant establishment under arid conditions. Depletion of seed food reserves, elongation of shoots and roots, and production of dry matter were determined during germination and during initial, seedling, and young-plant growth. Sampling was conducted at various intervals to 54 days in three environments. Nutrient solution and soil provided similar estimates of a positive relationship between germination rate and plant growth characteristics. Selections for fast germination rate showed greater growth rates than selections for slow germination during germination and initial, seedling, and young-plant growth periods. Selections for fast and slow rate of germination after the seed food reserves were utilized showed increased growth performances with photosynthetic activity. Genetic potential of selections with fast germination rate was reflected in the physiological processes of growth and development. Establishment of blue panicgrass under arid environments could be influenced by germplasm developed for germination rate. After germination and initial growth, seedling plants may provide a competitive advantage to young plants for greater dry matter production.

Key Words: Panicum antidotale Retz. • Seed food reserves • Shoot elongation • Root elongation • Dry matter production • Fast germination rate • Slow germination rate

² Research agronomist and research leader, USDA, SEA, AR, and professor, Univ. of Arizona, Tucson, AZ 85721.

Received for publication May 18, 1979.