کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2017087 1542067 2014 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Shedding light onto nutrient responses of arbuscular mycorrhizal plants: Nutrient interactions may lead to unpredicted outcomes of the symbiosis
ترجمه فارسی عنوان
رها شدن نور بر روی پاسخ های گیاهی گیاهان میکوریز آربوسکولار: تعاملات مغذی می تواند منجر به نتایج غیر منتظره ای از همزیستی
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک دانش گیاه شناسی
چکیده انگلیسی


• MGR and MNR were dependent on N availability.
• Reduced MNR led to lower Zn uptake, which was mostly responsible for negative MGR.
• MNR and MGR were not related to plant C investment in AM.
• Shoot C:N or N concentration may be the signal for plant C investment in AM.
• Integrative experimental designs are needed to address the complexity of AM.

The role and importance of arbuscular mycorrhizae (AM) in plant nitrogen (N) nutrition is uncertain. We propose that this be clarified by using more integrative experimental designs, with the use of a gradient of N supply and the quantification of an extensive array of plant nutrient contents. Using such an experimental design, we investigated AM effects on plant N nutrition, whether the mycorrhizal N response (MNR) determines the mycorrhizal growth response (MGR), and how MNR influences plants’ C economy.Oryza sativa plants were inoculated with Rhizophagus irregularis or Funneliformis mossae. AM effects were studied along a gradient of N supplies. Biomass, photosynthesis, nutrient and starch contents, mycorrhizal colonization and OsPT11 gene expression were measured. C investment in fungal growth was estimated. Results showed that, in rice, MGR was dependent on AM nutrient uptake effects, namely on the synergy between N and Zn, and not on C expenditure. The supply of C to the fungus was dependent on the plant's nutrient demand, indicated by high shoot C/N or low %N. We conclude that one of the real reasons for the negative MGR of rice, Zn deficiency of AMF plants, would have remained hidden without an experimental design allowing the observation of plants’ response to AM along gradients of nutrient concentrations. Adopting more integrative and comprehensive experimental approaches in mycorrhizal studies seems therefore essential if we are to achieve a true understanding of AM function, namely of the mechanisms of C/N exchange regulation in AM.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Plant Science - Volumes 221–222, May 2014, Pages 29–41
نویسندگان
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