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Leaf gas films contribute to rice ( Oryza sativa ) submergence tolerance during saline floods
Author(s) -
Herzog Max,
Konnerup Dennis,
Pedersen Ole,
Winkel Anders,
Colmer Timothy David
Publication year - 2018
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/pce.12873
Subject(s) - oryza sativa , photosynthesis , saline , salinity , chemistry , saline water , carbon dioxide , horticulture , rice plant , agronomy , zoology , botany , biology , ecology , endocrinology , biochemistry , organic chemistry , gene
Floods and salinization of agricultural land adversely impact global rice production. We investigated whether gas films on leaves of submerged rice delay salt entry during saline submergence. Two‐week‐old plants with leaf gas films (+GF) or with gas films experimentally removed (−GF) were submerged in artificial floodwater with 0 or 50 m m NaCl for up to 16 d. Gas films were present >9 d on GF plants after which gas films were diminished. Tissue ion analysis (Na + , Cl − and K + ) showed that gas films caused some delay of Na + entry, as leaf Na + concentration was 36–42% higher in −GF leaves than +GF leaves on days 1–5. However, significant net uptakes of Na + and Cl − , and K + net loss, occurred despite the presence of gas films, indicating the likely presence of some leaf‐to‐floodwater contact, so that the gas layer must not have completely separated the leaf surfaces from the water. Natural loss and removal of gas films resulted in severe declines in growth, underwater photosynthesis, chlorophyll a and tissue porosity. Submergence was more detrimental to leaf P N and growth than the additional effect of 50 m m NaCl, as salt did not significantly affect underwater P N at 200 μ m CO 2 nor growth.