Responses of squash to salinity, waterlogging, and subsequent drainage: I. Gas exchange, water relations, and nitrogen status
Titel:
Responses of squash to salinity, waterlogging, and subsequent drainage: I. Gas exchange, water relations, and nitrogen status
Auteur:
Huang, Bingru NeSmith, D. Scott Bridges, David C. Johnson, Jerry W.
Verschenen in:
Journal of plant nutrition
Paginering:
Jaargang 18 (1995) nr. 1 pagina's 127-140
Jaar:
1995-01
Inhoud:
To examine plant physiological responses to salinity, waterlogging, and subsequent drainage, summer squash (Cucurbita pepo) was grown in well watered or flooded sand with full-strength Hoagland solution containing 100 mol/m3 sodium chloride (NaCl) or no NaCl for 14 d. Half of the waterlogged plants were transferred to drained conditions for 7 d of recovery, while half of salinized plants were continuously salinized until 21 d. Waterlogging or salinity alone reduced photosynthetic rate (Pn), stomatal conductance (gs), and leaf chlorophyll content to a greater extent with waterlogging. Waterlogging alone, however, did not affect leaf water potential (ψ leaf) Salinity alone did not affect leaf and root nitrogen content. A combination of waterlogging and salinity exacerbated the adverse effects of each factor alone for Pn, gs, leaf chlorophyll, and nitrogen content, but not for ψ leaf. Seven days after termination of waterlogging, a full recovery occurred for gs, ψ leaf, leaf chlorophyll content, and leaf and root nitrogen content for waterlogged plants under non-saline conditions, while for waterlogged plants under saline conditions those parameters did not achieve that of the control value.