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Wheat ear carbon assimilation and nitrogen remobilization contribute significantly to grain yield

AutorZhou, Bangwei; Serret, María D.; Elazab, Abdelhalim; Bort, Pie, Jordi; Araus, José Luis; Aranjuelo, Iker ; Sanz-Sáez, Álvaro
Palabras claveRubisco
Nitrogen accumulation
Carbon accumulation
Grain yield
Ear
Fecha de publicaciónnov-2016
EditorJohn Wiley & Sons
CitaciónJournal of Integrative Plant Biology 58(11): 914-926 (2016)
ResumenThe role of wheat ears as a source of nitrogen (N) and carbon (C) in the grain filling process has barely been studied. To resolve this question, five wheat genotypes were labeled with N-enriched nutrient solution. N remobilization and absorption were estimated via the nitrogen isotope composition of total organic matter and Rubisco. Gas exchange analyses showed that ear photosynthesis contributed substantially to grain filling in spite of the great loss of C due to respiration. Of the total kernel N, 64.7% was derived from the N acquired between sowing and anthesis, while the remaining 35.3% was derived from the N acquired between anthesis and maturity. In addition, 1.87 times more N was remobilized to the developing kernel from the ear than from the flag leaf. The higher yielding genotypes showed an increased N remobilization to the kernel compared to the lower yielding genotypes. In addition, the higher yielding genotypes remobilized more N from the ears to the kernel than the lower yielding genotypes, while the lower yielding genotypes remobilized more N from the flag leaf to the kernel. Therefore, the ears contribute significantly toward fulfilling C and N demands during grain filling.
Versión del editorhttp://doi.org/10.1111/jipb.12478
URIhttp://hdl.handle.net/10261/141735
DOI10.1111/jipb.12478
Identificadoresissn: 1744-7909
e-issn: 1672-9072
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