Coordinated regulation of photosynthesis in rice increases yield and tolerance to environmental stress

Madana M. R. Ambavaram, Supratim Basu, Arjun Krishnan, Venkategowda Ramegowda, Utlwang Batlang, Lutfor Rahman, Niranjan Baisakh and Andy Pereira ()
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Madana M. R. Ambavaram: Virginia Bioinformatics Institute, Virginia Tech
Supratim Basu: Soil, and Environmental Sciences, University of Arkansas
Arjun Krishnan: Virginia Bioinformatics Institute, Virginia Tech
Venkategowda Ramegowda: Soil, and Environmental Sciences, University of Arkansas
Utlwang Batlang: Virginia Bioinformatics Institute, Virginia Tech
Lutfor Rahman: Soil, and Environmental Sciences, University of Arkansas
Niranjan Baisakh: School of Plant, Environmental, and Soil Sciences, Louisiana State University Agricultural Center
Andy Pereira: Virginia Bioinformatics Institute, Virginia Tech

Nature Communications, 2014, vol. 5, issue 1, 1-14

Abstract: Abstract Plants capture solar energy and atmospheric carbon dioxide (CO2) through photosynthesis, which is the primary component of crop yield, and needs to be increased considerably to meet the growing global demand for food. Environmental stresses, which are increasing with climate change, adversely affect photosynthetic carbon metabolism (PCM) and limit yield of cereals such as rice (Oryza sativa) that feeds half the world. To study the regulation of photosynthesis, we developed a rice gene regulatory network and identified a transcription factor HYR (HIGHER YIELD RICE) associated with PCM, which on expression in rice enhances photosynthesis under multiple environmental conditions, determining a morpho-physiological programme leading to higher grain yield under normal, drought and high-temperature stress conditions. We show HYR is a master regulator, directly activating photosynthesis genes, cascades of transcription factors and other downstream genes involved in PCM and yield stability under drought and high-temperature environmental stress conditions.

Date: 2014
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DOI: 10.1038/ncomms6302

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