期刊
PLANT CELL AND ENVIRONMENT
卷 42, 期 2, 页码 448-465出版社
WILEY
DOI: 10.1111/pce.13413
关键词
auxin; metabolic adjustment; mitochondria; photosynthesis; plant hormones; respiration; stomata
资金
- Fundacao de Amparo a Pesquisa do Estado de Minas Gerais (FAPEMIG) [APQ-01357-14, APQ-01078-15]
- Max-Planck-Gesellschaft
- Brazilian Federal Agency for Support and Evaluation of Graduate Education (CAPES)
- Conselho Nacional deDesenvolvimento Cientifico e Tecnologico (CNPq)
- Foundation for Research Assistance of the Sao Paulo State (FAPESP) [2014/16553-1]
Auxin modulates a range of plant developmental processes including embryogenesis, organogenesis, and shoot and root development. Recent studies have shown that plant hormones also strongly influence metabolic networks, which results in altered growth phenotypes. Modulating auxin signalling pathways may therefore provide an opportunity to alter crop performance. Here, we performed a detailed physiological and metabolic characterization of tomato (Solanum lycopersicum) mutants with either increased (entire) or reduced (diageotropica-dgt) auxin signalling to investigate the consequences of altered auxin signalling on photosynthesis, water use, and primary metabolism. We show that reduced auxin sensitivity in dgt led to anatomical and physiological modifications, including altered stomatal distribution along the leaf blade and reduced stomatal conductance, resulting in clear reductions in both photosynthesis and water loss in detached leaves. By contrast, plants with higher auxin sensitivity (entire) increased the photosynthetic capacity, as deduced by higher V-cmax and J(max) coupled with reduced stomatal limitation. Remarkably, our results demonstrate that auxin-sensitive mutants (dgt) are characterized by impairments in the usage of starch that led to lower growth, most likely associated with decreased respiration. Collectively, our findings suggest that mutations in different components of the auxin signalling pathway specifically modulate photosynthetic and respiratory processes.
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