Optimizing rice plant photosynthate allocation reduces N2O emissions from paddy fields.

Abstract:

:Rice paddies are a major source of anthropogenic nitrous oxide (N2O) emissions, especially under alternate wetting-drying irrigation and high N input. Increasing photosynthate allocation to the grain in rice (Oryza sativa L.) has been identified as an effective strategy of genetic and agronomic innovation for yield enhancement; however, its impacts on N2O emissions are still unknown. We conducted three independent but complementary experiments (variety, mutant study, and spikelet clipping) to examine the impacts of rice plant photosynthate allocation on paddy N2O emissions. The three experiments showed that N2O fluxes were significantly and negatively correlated with the ratio of grain yield to total aboveground biomass, known as the harvest index (HI) in agronomy (P < 0.01). Biomass accumulation and N uptake after anthesis were significantly and positively correlated with HI (P < 0.05). Reducing photosynthate allocation to the grain by spikelet clipping significantly increased white root biomass and soil dissolved organic C and reduced plant N uptake, resulting in high soil denitrification potential (P < 0.05). Our findings demonstrate that optimizing photosynthate allocation to the grain can reduce paddy N2O emissions through decreasing belowground C input and increasing plant N uptake, suggesting the potential for genetic and agronomic efforts to produce more rice with less N2O emissions.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Jiang Y,Huang X,Zhang X,Zhang X,Zhang Y,Zheng C,Deng A,Zhang J,Wu L,Hu S,Zhang W

doi

10.1038/srep29333

subject

Has Abstract

pub_date

2016-07-05 00:00:00

pages

29333

issn

2045-2322

pii

srep29333

journal_volume

6

pub_type

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