Rice yield improvements through plant breeding are offset by inherent yield declines over time

Espe, Matthew B.; Hill, J. E.; Leinfelder-Miles, Michelle; Espino, Luis; Mutters, Randall; Mackill, David J.; Kessel, Chris van

doi:10.1016/j.fcr.2018.03.017

Cited by 18 publications

(10 citation statements)

References 24 publications

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“…6 values are SE. resistance against diseases, and poor response to new management practices (30). However, our results not represent this scenario because new improved entries were continuously introduced.…”

Section: Discussionmentioning

confidence: 59%

“…Our analysis revealed that the genetic improvement among the cultivars in the experiment from 1968 to 2017 was not sufficient to compensate for environmental change and neither did it allow for increasing seasonal yields or annual production of rice. Usually, cultivars tend to reduce their performance over the years for many factors, such as emerging new diseases, breaking down the resistance against diseases, and poor response to new management practices ( 30 ). However, our results do not represent this scenario because new improved entries were continuously introduced.…”

Section: Discussionmentioning

confidence: 99%

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Steady agronomic and genetic interventions are essential for sustaining productivity in intensive rice cropping

Ladha

Radanielson

Rutkoski

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

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Intensive systems with two or three rice (Oryza sativa L.) crops per year account for about 50% of the harvested area for irrigated rice in Asia. Any reduction in productivity or sustainability of these systems has serious implications for global food security. Rice yield trends in the world’s longest-running long-term continuous cropping experiment (LTCCE) were evaluated to investigate consequences of intensive cropping and to draw lessons for sustaining production in Asia. Annual production was sustained at a steady level over the 50-y period in the LTCCE through continuous adjustment of management practices and regular cultivar replacement. Within each of the three annual cropping seasons (dry, early wet, and late wet), yield decline was observed during the first phase, from 1968 to 1990. Agronomic improvements in 1991 to 1995 helped to reverse this yield decline, but yield increases did not continue thereafter from 1996 to 2017. Regular genetic and agronomic improvements were sufficient to maintain yields at steady levels in dry and early wet seasons despite a reduction in the yield potential due to changing climate. Yield declines resumed in the late wet season. Slower growth in genetic gain after the first 20 y was associated with slower breeding cycle advancement as indicated by pedigree depth. Our findings demonstrate that through adjustment of management practices and regular cultivar replacement, it is possible to sustain a high level of annual production in irrigated systems under a changing climate. However, the system was unable to achieve further increases in yield required to keep pace with the growing global rice demand.

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Section: Discussionmentioning

confidence: 59%

Section: Discussionmentioning

confidence: 99%

Steady agronomic and genetic interventions are essential for sustaining productivity in intensive rice cropping

Ladha

Radanielson

Rutkoski

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

View full text Add to dashboard Cite

show abstract

“…However, we are cautious about the associated timeline and potential impact. For example, we note that the yield potential of inbred rice varieties has not changed substantially over the past 65 years 39,40 . Similarly, efforts to achieve a step-change in rice yield potential by incorporating C 4 photosynthetic pathway will not lead to any commercially available variety in the near future 41 .…”

Section: Discussionmentioning

confidence: 97%

Can Southeast Asia continue to be a major rice bowl?

Yuan

Stuart

Edreira

et al. 2021

Preprint

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Southeast Asia is a major rice-producing region, with high level of internal consumption and accounting for 40% of global rice exports. Limited land resources, climate change, and yield stagnation during recent years have once again raised concerns about the capacity of the region to meet the growing demand for rice and remain as a large net exporter. Here we use a modelling approach to map rice yield gaps and assess production potential and net exports by 2040. We find that the average yield gap represents 48% of the yield potential estimate for the region. Exploitable yield gaps are relatively large in Cambodia, Myanmar, Philippines, and Thailand, but comparably smaller in Indonesia and Vietnam. Continuation of current yield trends will not allow Indonesia and Philippines to meet their domestic rice demand. In contrast, closing the exploitable yield gap would allow all countries to achieve rice self-sufficiency, with an aggregated annual rice surplus of 100 million tons available for export. Our study provides insights for increasing regional production on existing cropland by narrowing existing yield gaps.

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“…Likewise, our water-limited yield potential of 5.3 Mg ha −1 per crop for rainfed lowland aromatic rice was consistent with that reported for similar varieties in northeastern Thailand (5.3 Mg ha −1 per crop) and measured yields in field experiments, ranging from 5.1 Mg ha −1 per crop to 5.5 Mg ha −1 per crop [50][51][52] . Our study does not consider the improvement in genetic rice yield potential over time 48,53 , including adaptation to rising temperatures or more frequent droughts or floods. However, we are cautious about the associated timeline and potential impact.…”

Section: Discussionmentioning

confidence: 99%

Southeast Asia must narrow down the yield gap to continue to be a major rice bowl

et al. 2022

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Southeast Asia is a major rice-producing region with a high level of internal consumption and accounting for 40% of global rice exports. Limited land resources, climate change and yield stagnation during recent years have once again raised concerns about the capacity of the region to remain as a large net exporter. Here we use a modelling approach to map rice yield gaps and assess production potential and net exports by 2040. We find that the average yield gap represents 48% of the yield potential estimate for the region, but there are substantial differences among countries. Exploitable yield gaps are relatively large in Cambodia, Myanmar, Philippines and Thailand but comparably smaller in Indonesia and Vietnam. Continuation of current yield trends will not allow Indonesia and Philippines to meet their domestic rice demand. In contrast, closing the exploitable yield gap by half would drastically reduce the need for rice imports with an aggregated annual rice surplus of 54 million tons available for export. Our study provides insights for increasing regional production on existing cropland by narrowing existing yield gaps.

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Rice yield improvements through plant breeding are offset by inherent yield declines over time

Cited by 18 publications

References 24 publications

Steady agronomic and genetic interventions are essential for sustaining productivity in intensive rice cropping

Steady agronomic and genetic interventions are essential for sustaining productivity in intensive rice cropping

Can Southeast Asia continue to be a major rice bowl?

Southeast Asia must narrow down the yield gap to continue to be a major rice bowl

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