Response of Neotyphodium lolii-infected perennial ryegrass to phosphorus deficiency
Ren, A.Z.,Nankai Univ., Tianjin (China). Coll. of Life Science | Gao, Y.B.,Nankai Univ., Tianjin (China). Coll. of Life Science | Zhou, F.,Nankai Univ., Tianjin (China). Coll. of Life Science
It has been demonstrated that endophyte-infected (EI) ryegrass performed better in response to N deficiency than its endophyte-free (EF) counterpart. When P is considered, there is a lack of related information. In this study, Lolium perenne L. infected with Neotyphodium lolii was employed to establish EI and EF populations. Soil-grown EI and EF ryegrass were tested for their responses to P deficiency. The results showed that the endophyte infection improved the adaptability of ryegrass to P deficiency. When P was limited, EI roots were significantly longer (EI, 398.8; EF, 323.4 m/pot) and heavier (EI, 30.58; EF, 23.20 g/pot) than EF roots; the root: shoot ratio of EI plants was greater than that of EF plants (P less than 0.05). The content of total phenolics and organic acids was significantly greater in EI than in EF roots at low P supply; the concentration of both, however, was not improved by the endophyte infection. This suggested that it was the higher root dry weight (DW) that contributed to the higher content of total phenolics and organic acids for EI plants, and the endophyte infection might have negligible effects on chemical modification of perennial ryegrass. Endophyte infection did not increase P uptake rate but did significantly improve P use efficiency of ryegrass in response to P deficiency (EI: 0.734; EF: 0.622 g DW/mg P).
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