The mitigating effects of Na+accumulation on the drought-induced damage to photosynthetic apparatus in cotton seedlings

Abiotic stresses such as drought and salinity are major factors affecting plant growth and development, leading to the reductions in crop productivity. It is generally believed that plant water stress is exacerbated by saline soils. However, sodium ions absorbed by plant cells are partmentalized int...

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Veröffentlicht in:Sheng tai xue bao 2015-01, Vol.35 (19), p.6549-6556
Hauptverfasser: Xie, Weihai, Ma, Shujie, Qi, Lin, Zhang, Zhenhua, Bai, Xinfu
Format: Artikel
Sprache:chi
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Zusammenfassung:Abiotic stresses such as drought and salinity are major factors affecting plant growth and development, leading to the reductions in crop productivity. It is generally believed that plant water stress is exacerbated by saline soils. However, sodium ions absorbed by plant cells are partmentalized into vacuoles, and function as an effective osmoregulator, increasing the ability of plants to absorb and retain water. Thus, salt uptake in plants may potentially alleviate the adverse effects of drought. In this study, pot grown cotton plants were watered with NaCl solutions of different concentrations at a plant height of ca. 20 cm, followed by a sustained drought treatment. Parameters such as chlorophyll fluorescence, photosynthesis and gas exchange, plant water status, tissue Na+content, etc. were measured during drought stress were taken to assess whether Na+could alleviate drought induced photosystem dysfunction in leaves and identify the mechanisms involved. The leaf photosynthetic rates and the gas exchange o
ISSN:1000-0933
DOI:10.5846/stxb201403060382