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Arbuscular mycorrhizas and water relations in maize under drought stress at tasselling
Author(s) -
SUBRAMANIAN K. S.,
CHAREST C.,
DWYER L. M.,
HAMILTON R. I.
Publication year - 1995
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.1469-8137.1995.tb03033.x
Subject(s) - transpiration , biology , agronomy , sowing , cultivar , drought tolerance , population , water stress , arbuscular mycorrhizal fungi , arbuscular mycorrhizal , greenhouse , inoculation , horticulture , photosynthesis , botany , symbiosis , demography , genetics , sociology , bacteria
summary A greenhouse experiment was conducted to investigate the influence of an arbuscular mycorrhizal (AM) fungus ( Glomus intraradices Schenck & Smith) on drought tolerance in tropical maize. Freshly regenerated seeds of selection cycles 0 (cv. C0, drought‐sensitive) and 8 (cv. C8, drought‐resistant) of the lowland tropical population ‘Tuxpeño sequia’ were used for this study. Maize plants were subjected to drought stress for three weeks following tasselling (75–95 days after sowing). During the drought stress period, midday leaf water potential (LWP), stomatal resistance (SR) and transpiration rate (TR) were monitored daily, and green leaf area (GLA) determined at alternate days to assess the effects of mycorrhizal inoculation. Mycorrhizal plants of the cultivars CO and C8 had higher (less negative) LWP and TR, and lower SR throughout the experiment. The GLA was 27.5 % higher in mycorrhizal than non‐mycorrhizal CO plants under drought conditions. Results indicate that mycorrhizal significantly improve tolerance to moderate drought stress imposed at tasselling, especially for the sensitive CO maize cultivar.