Journal
PLANT GROWTH REGULATION
Volume 64, Issue 2, Pages 155-161Publisher
SPRINGER
DOI: 10.1007/s10725-010-9551-0
Keywords
Nitric oxide; Nitrite; Potassium ferricyanide; Reactive oxygen species; Seed dormancy; Sodium nitroprusside
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Funding
- National Natural Sciences Foundation of China [30870223]
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Nitric oxide (NO) and reactive oxygen species (ROS) are important regulators involving various processes of plant growth and development. Amaranthus retroflexus L. seeds possess a relative dormancy property that means freshly collected seeds can only germinate over a limited, high temperature range. Here, we show that the relative dormancy of A. retroflexus seeds could be significantly released following treatments with exogenous NO/cyanide (CN) donors such as nitrite, gases evolved from acidified nitrite, sodium nitroprusside (SNP), potassium ferricyanide (Fe(III)CN) and gases evolved from SNP or Fe(III)CN solutions, as well as exogenously supplied ROS, hydrogen peroxide (H(2)O(2)). However, the effectiveness varied among these chemicals. Gases evolved from acidified nitrite displayed maximum effect while H(2)O(2) had minimum effect. We also show that the effects of these compounds could be significantly inhibited by NO specific scavenger 2-phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl 3-oxide (PTIO), indicating that NO signaling pathway might play a central role in the dormancy release and germination of A. retroflexus seeds, while both ROS and CN might act through NO-dependent signaling cascades.
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