02003nas a2200157   4500008004100000245012400041210006900165300001300234490000700247520139000254653002201644100002001666700001701686700001501703856012701718       1990                        eng d00aDifferential responses of C3 and C4 grasses to mycorrhizal symbiosis, phosphorus fertilization, and soil microorganisms0 aDifferential responses of C3 and C4 grasses to mycorrhizal symbi  a461 -4670 v683 a<p>The responses of five C4, warm-season and five C3, cool-season tallgrass prairie grasses to phosphorus (P) fertilization, mycorrhizae, and soil microorganisms were compared in greenhouse studies. The warm-season grasses responded positively to mycorrhizae and to P fertilization, but mycorrhizal plants did not respond to P. The soil microflora reduced mycorrhizal plant dry weight and root colonization. In contrast, cool-season grasses did not respond to mycorrhizae or P fertilization. Soil microorganisms did not suppress cool-season plant growth, but root colonization was reduced in nonsterile soil. For the warm-season grasses there was an inverse relationship between mycorrhizal root colonization and P fertilization and a positive relationship between root colonization and plant dry weight. For the cool-season grasses there was also an inverse relationship between root colonization and P fertilization, but the relationship between root colonization and plant dry weight was negative. In both the warm-season and cool-season grasses, low levels of mycorrhizal root colonization persisted even when P fertilization was sufficient to eliminate mycorrhizal effects on plant growth. Thus, warm-and cool-season grasses display profoundly different strategies for nutrient acquisition. Key words: cool-season grasses, warm-season grasses, vesicular-arbuscular mycorrhizae</p>10atallgrass prairie1 aHetrick, B.A.D.1 aWilson, G.T.1 aTodd, T.C.  uhttp://knz.lternet.edu/content/differential-responses-c3-and-c4-grasses-mycorrhizal-symbiosis-phosphorus-fertilization-and