Beneficial effects of Neotyphodium tembladerae and Neotyphodium pampeanum on a wild forage grass

IANNONE L.J; PINGET, A.D.; NAGABHYRU P; SCHARDL, C.L.; DE BATTISTA J,P.

GRASS AND FORAGE SCIENCE (PRINT)

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2012 p. 382 - 390

0142-5242

Asexual, vertically transmitted fungal endophytes in genus Neotyphodium are considered to enhance growth, stress resistance and competitiveness of agronomic grasses, but have been suggested to have neutral or deleterious effects on wild grasses. We studied whether the associations between Bromus auleticus and their endophytes, Neotyphodiumpampeanum and Neotyphodium tembladerae, are beneficial for this wild forage grass native to South America. In a greenhouse experiment, 3-month-old endophyte-infected plants (E+) showed enhanced growth relative to their endophyte-free counterparts (E)). In a one-year-long experiment in the field, E+ plants showed higher survival and regrowth rate, and produced more biomass and seeds than E) plants. Only with respect to the seed output did N. tembladerae seems to be detrimental, whereas N. pampeanum did not affect this parameter. No differences were observed with respect to the germination of seeds produced by E+ or E) plants. Loline alkaloids were detected in N. pampeanum- infected plants. Our results show that, similar with results on agronomic grasses, in wild grasses, the symbiosis with Neotyphodium species could be mutualistic.