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WATER RELATIONS OF MYCORRHIZAL AND PHOSPHORUS‐FERTILIZED NON‐MYCORRHIZAL CITRUS UNDER DROUGHT STRESS *
Author(s) -
GRAHAM J. H.,
SYVERTSEN J. P.,
SMITH M. L.
Publication year - 1987
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1987.tb00878.x
Subject(s) - rootstock , transpiration , orange (colour) , rough lemon , mycorrhiza , trifoliate orange , citrus × sinensis , horticulture , biology , phosphorus , glomus , agronomy , inoculation , botany , chemistry , photosynthesis , symbiosis , bacteria , genetics , organic chemistry
S ummary Rootstock seedlings of Carrizo citrange ( Poncirus trifoliata (L.) Raf. x C. Sinensis (L.) Osbeck) and sour orange ( Citrus aurontium L.) were grown in a sandy soil low in phosphorus (P) and either inoculated with Glomus intraradices Schenck & Smith (vesicular‐arbuscular mycorrhizal; VAM) or fertilized with soluble P (non‐mycorrhizal; NM). Five‐month‐old VAM and NM seedlings of each rootstock were comparable in size, P sufficiency, and relative growth rate whether they were kept well‐watered or subjected to two drought‐stress cycles of short duration. Under well‐watered conditions, whole plant transpiration, leaf water status, and root hydraulic conductivity were similar for VAM and NM plants of each rootstock. During drought‐stress and recovery periods, VAM plants also had very comparable whole‐plant transpiration rates and leaf water potentials to NM plants, but mycorrhiza reduced root hydraulic conductivity of Carrizo citrange and sour orange 66 and 49%, respectively. These data do not support the hypothesis that mycorrhiza significantly enhance water relations of citrus under the drought‐stress conditions studied.