Endophyte-mediated effects on the growth and physiology of Achnatherum sibiricum are conditional on both N and P availability.

The interaction of endophyte-grass associations are conditional on nitrogen (N) availability, but the reported responses of these associations to N are inconsistent. We hypothesized that this inconsistency is caused, at least in part, by phosphorus (P) availability. In this experiment, we compared t...

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Autores principales:	Xia Li, Anzhi Ren, Rong Han, Lijia Yin, Maoying Wei, Yubao Gao
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2012
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/6d157a19ebcb44dc9d877c5f8a6b3d04
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spelling	oai:doaj.org-article:6d157a19ebcb44dc9d877c5f8a6b3d042021-11-18T08:08:12ZEndophyte-mediated effects on the growth and physiology of Achnatherum sibiricum are conditional on both N and P availability.1932-620310.1371/journal.pone.0048010https://doaj.org/article/6d157a19ebcb44dc9d877c5f8a6b3d042012-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/23185245/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203The interaction of endophyte-grass associations are conditional on nitrogen (N) availability, but the reported responses of these associations to N are inconsistent. We hypothesized that this inconsistency is caused, at least in part, by phosphorus (P) availability. In this experiment, we compared the performance of endophyte-infected (EI) and endophyte-free (EF) Achnatherum sibiricum subjected to four treatments comprising a factorial combination of two levels of N (N+ vs. N-, i.e. N supply vs. N deficiency) and two levels of P (P+ vs. P-, i.e. P supply vs. P deficiency) availability. The results showed that A. sibiricum-Neotyphodium associations were conditional on both N and P availability, but more conditional on N than P. Under N+P- conditions, endophyte infection significantly improved acid phosphatase activity of EI plants, such that the biomass of EI plants was not affected by P deficiency (i.e. similar growth to N+P+ conditions), and resulted in more biomass in EI than EF plants. Under N-P+ conditions, biomass of both EI and EF decreased compared with N+P+; however, EI biomass decreased slowly by decreasing leaf N concentration more rapidly but allocating higher fractions of N to photosynthetic machinery compared with EF plants. This change of N allocation not only improved photosynthetic ability of EI plants but also significantly increased their biomass. Under N-P- conditions, EI plants allocated higher fractions of N to photosynthesis and had greater P concentrations in roots, but there was no significant difference in biomass between EI and EF plants. Our results support the hypothesis that endophyte-grass interactions are dependent on both N and P availability. However, we did not find a clear cost of endophyte infection in A. sibiricum.Xia LiAnzhi RenRong HanLijia YinMaoying WeiYubao GaoPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 7, Iss 11, p e48010 (2012)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Xia Li Anzhi Ren Rong Han Lijia Yin Maoying Wei Yubao Gao Endophyte-mediated effects on the growth and physiology of Achnatherum sibiricum are conditional on both N and P availability.
description	The interaction of endophyte-grass associations are conditional on nitrogen (N) availability, but the reported responses of these associations to N are inconsistent. We hypothesized that this inconsistency is caused, at least in part, by phosphorus (P) availability. In this experiment, we compared the performance of endophyte-infected (EI) and endophyte-free (EF) Achnatherum sibiricum subjected to four treatments comprising a factorial combination of two levels of N (N+ vs. N-, i.e. N supply vs. N deficiency) and two levels of P (P+ vs. P-, i.e. P supply vs. P deficiency) availability. The results showed that A. sibiricum-Neotyphodium associations were conditional on both N and P availability, but more conditional on N than P. Under N+P- conditions, endophyte infection significantly improved acid phosphatase activity of EI plants, such that the biomass of EI plants was not affected by P deficiency (i.e. similar growth to N+P+ conditions), and resulted in more biomass in EI than EF plants. Under N-P+ conditions, biomass of both EI and EF decreased compared with N+P+; however, EI biomass decreased slowly by decreasing leaf N concentration more rapidly but allocating higher fractions of N to photosynthetic machinery compared with EF plants. This change of N allocation not only improved photosynthetic ability of EI plants but also significantly increased their biomass. Under N-P- conditions, EI plants allocated higher fractions of N to photosynthesis and had greater P concentrations in roots, but there was no significant difference in biomass between EI and EF plants. Our results support the hypothesis that endophyte-grass interactions are dependent on both N and P availability. However, we did not find a clear cost of endophyte infection in A. sibiricum.
format	article
author	Xia Li Anzhi Ren Rong Han Lijia Yin Maoying Wei Yubao Gao
author_facet	Xia Li Anzhi Ren Rong Han Lijia Yin Maoying Wei Yubao Gao
author_sort	Xia Li
title	Endophyte-mediated effects on the growth and physiology of Achnatherum sibiricum are conditional on both N and P availability.
title_short	Endophyte-mediated effects on the growth and physiology of Achnatherum sibiricum are conditional on both N and P availability.
title_full	Endophyte-mediated effects on the growth and physiology of Achnatherum sibiricum are conditional on both N and P availability.
title_fullStr	Endophyte-mediated effects on the growth and physiology of Achnatherum sibiricum are conditional on both N and P availability.
title_full_unstemmed	Endophyte-mediated effects on the growth and physiology of Achnatherum sibiricum are conditional on both N and P availability.
title_sort	endophyte-mediated effects on the growth and physiology of achnatherum sibiricum are conditional on both n and p availability.
publisher	Public Library of Science (PLoS)
publishDate	2012
url	https://doaj.org/article/6d157a19ebcb44dc9d877c5f8a6b3d04
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Endophyte-mediated effects on the growth and physiology of Achnatherum sibiricum are conditional on both N and P availability.

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