Impact of phosphorus supply on root exudation, aerenchyma formation and methane emission of rice plants
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• depressed shoot growth but increased root growth in culture solution.
• increments in the root/shoot ratio by factors of 1.4 to 1.9 at flowering stage.
• enhanced the development of root aerenchyma, and
• stimulation of root exudation per plant by factors of 1.3–1.8 as compared to medium P supply and by factors of 2.1–2.4 as compared to high P supply.
However, root exudation did not differ among treatments when related to the dry weight of roots. Thus, high exudation rates were caused by larger root biomass and not by higher activity of the root tissue.
• higher CH4 concentrations in soil solution; i.e., at flowering stage the soil solution concentrations were 34–50 μM under P deficiency and 10–22 μM under ample P supply and
• significant increases of CH4 emission rates during the later stages of plant growth.
These findings reflect a chain of response mechanisms to P stress, that ultimately lead to higher methane emission rates.
Key wordsaerenchyma formation dissolved methane methane emission phosphorus deficiency plant growth root exudation
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