期刊
PLANTA
卷 234, 期 2, 页码 271-280出版社
SPRINGER
DOI: 10.1007/s00425-011-1396-x
关键词
Anoxic signalling; Cytosolic calcium; Fluorescence microscopy; Oryza; Triticum
资金
- Swedish Institute
- Swedish Royal Agricultural Academy (KSLA)
- Knut and Alice Wallenberg Foundation
- Russian Foundation for Basic Research [07-04-01056a, 10-04-01035a]
- Russian Ministry of Education and Science [2006-RI-111.0/002/037, 2010-1.3.2-203-002-008]
The anoxia-dependent elevation of cytosolic Ca2+ concentration, [Ca2+](cyt), was investigated in plants differing in tolerance to hypoxia. The [Ca2+](cyt) was measured by fluorescence microscopy in single protoplasts loaded with the calcium-fluoroprobe Fura 2-AM. Imposition of anoxia led to a fast (within 3 min) significant elevation of [Ca2+](cyt) in rice leaf protoplasts. A tenfold drop in the external Ca2+ concentration (to 0.1 mM) resulted in considerable decrease of the [Ca2+](cyt) shift. Rice root protoplasts reacted upon anoxia with higher amplitude. Addition of plasma membrane (verapamil, La3+ and EGTA) and intracellular membrane Ca2+-channel antagonists (Li+, ruthenium red and cyclosporine A) reduced the anoxic Ca2+-accumulation in rice. Wheat protoplasts responded to anoxia by smaller changes of [Ca2+](cyt). In wheat leaf protoplasts, the amplitude of the Ca2+-shift little depended on the external level of Ca2+. Wheat root protoplasts were characterized by a small shift of [Ca2+](cyt) under anoxia. Plasmalemma Ca2+-channel blockers had little effect on the elevation of cytosolic Ca2+ in wheat protoplasts. Intact rice seedlings absorbed Ca2+ from the external medium under anoxic treatment. On the contrary, wheat seedlings were characterized by leakage of Ca2+. Verapamil abolished the Ca2+ influx in rice roots and Ca2+ efflux from wheat roots. Anoxia-induced [Ca2+](cyt) elevation was high particularly in rice, a hypoxia-tolerant species. In conclusion, both external and internal Ca2+ stores are important for anoxic [Ca2+](cyt) elevation in rice, whereas the hypoxia-intolerant wheat does not require external sources for [Ca2+](cyt) rise. Leaf and root protoplasts similarly responded to anoxia, independent of their organ origin.
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