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Physiological response of the facultative halophyte, Aeluropus littoralis, to different salt types and levels

Author:
Barhoumi, Zouhaier
Source:
Plant biosystems 2019 v.153 no.2 pp. 298-305
ISSN:
1724-5575
Subject:
Aeluropus, greenhouses, halophytes, leaves, photosynthesis, physiological response, plant growth, plant tissues, plantlets, potassium chloride, salinity, sodium, sodium chloride, sodium sulfate, stomatal conductance, toxicity, water use efficiency
Abstract:
The present study investigated the effects of NaCl, KCl and Na₂SO₄ salts on the C₄ excreting halophyte Aeluropus littoralis in relation to growth, mineral status and photosynthesis in greenhouse conditions. Plantlets were subjected to five salinity levels: 0, 200, 400, 600 and 800 mM for 30 days. Growth decreased progressively with salinity increase, its reduction might be correlated with the high sodium (and/or chloride) accumulation in plant tissues, the decrease of leaf water status and the decline of the net photosynthetic rate and the intrinsic water use efficiency. Na₂SO₄ appeared more toxic than KCl and NaCl, especially at 200 mM. At 200 mM, Na₂SO₄ reduced plant growth by 61% while for other salt forms, the reductions were less than 20%. At this salt level, stomatal conductance showed a consistent pattern with plant growth and could adequately explain the variations between the effects of the three salt types.
Agid:
6336917