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Inflorescence Gas Exchange and Seed Weight of Blue Panicgrass¹

Blue panicgrass (Panicum antidotale Retz.) selections from six cycles of recurrent selection for heavy and lightseed weight were evaluated to establish the relationship between photosynthesis and respiration rates of inflorescences and seed weight. Selections with light seed weight had lower apparent photosynthesis and higher dark-respiration rates of inflorescences. Data suggest that differences in seed weight of plants grown from heavy and light-seed weight can be attributed partly to availability of less assimilate for storage during development of seed of lightseed weight selections.

Key Words: Photosynthesis • Respiration • Dry matter accumulation • Recurrent selection • Photosynthesis to respiration (P:R) ratio

² Research associate, Dep. of Agron., Iowa State U., Ames (formerly, graduate fellow, Natl. Defense Ed. Act, Dep. of Agron. and Plant Genet., U. of Ariz. and research leader, ARS, USDA, and professor, Dep. of Agron. and Plant Genet., U. of Ariz., Tucson, AZ 85721, respectively.

Received for publication September 9, 1974.