Are arbuscular-mycorrhizal Alnus incana seedlings more resistant to drought than ectomycorrhizal and nonmycorrhizal ones?

Autor:	Jouni Kilpeläinen, Tarja Lehto, Sammi Alam Nipu, Bartosz Adamczyk, Pedro J. Aphalo, Aitor Barbero-López
Rok vydání:	2020
Předmět:	0106 biological sciences Stomatal conductance Physiology Plant Science Alnus Plant Roots 01 natural sciences Alder Nutrient Mycorrhizae Symbiosis 2. Zero hunger Alnus incana biology Wilting 04 agricultural and veterinary sciences biology.organism_classification Droughts Ectomycorrhiza Arbuscular mycorrhiza Horticulture Seedlings Shoot 040103 agronomy & agriculture 0401 agriculture forestry and fisheries 010606 plant biology & botany
Zdroj:	Tree Physiology. 40:782-795
ISSN:	1758-4469
Popis:	Arbuscular mycorrhizas (AMs) prevail in warm and dry climates and ectomycorrhizas (EMs) in cold and humid climates. We suggest that the fungal symbionts benefit their host plants especially in the corresponding conditions. The hypothesis tested was that AM plants are more drought-resistant than EM or nonmycorrhizal (NM) plants. Grey alder (Alnus incana (L.) Moench) seedlings were inoculated with two species of either AM or EM fungi or none. In one controlled-environment experiment, there was a watering and a drought treatment. Another set of seedlings were not watered until permanent wilting. The AM plants were somewhat smaller than EM and NM, and at the early stage of the drought treatment, the soil-moisture content was slightly higher in the AM pots. Shoot water potential was highest in the AM treatment during severe drought, while stomatal conductance and photosynthesis did not show a mycorrhizal effect. In the lethal-drought set, the AM plants maintained their leaves longer than EM and NM plants, and the AM seedlings survived longer than NM seedlings. Foliar phosphorus and sulfur concentrations remained higher in AM plants than EM or NM, but potassium, copper and iron increased in EM during drought. The root tannin concentration was lower in AM than EM and drought doubled it. Although the difference in drought resistance was not large, the hypothesis was supported by the better performance of AM plants during a severe short-term drought. Sustained phosphorus nutrition during drought in AM plants was a possible reason for this. Moreover, the higher foliar sulfur and lower metal-nutrient concentrations in AM may reflect differences in nutrient uptake or (re)translocation during drought, which merit further research. The much larger tannin concentrations in EM root systems than AM did not appear to protect the EM plants from drought. The differential tannin accumulation in AM and EM plants needs further attention.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::414a4cbf9002d40b4968d2d12495ca17 https://doi.org/10.1093/treephys/tpaa035 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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