Contribution of the ear and the fl ag leaf to grain fi lling in durum wheat inferred from the carbon isotope signature: Genotypic and growing conditions eff ects FA |
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作者姓名: | Rut Sanchez-Bragado Abdelhalim Elazab Bangwei Zhou Maria Dolors Serret Jordi Bort Maria Teresa Nieto-Taladriz and José Luis Araus |
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摘 要: | The ear, together with the flag leaf, is believed to play a major role as a source of assimilates during grain filling in C3cereals. However, the intrusive nature of most of the available methodologies prevents reaching conclusive results in this regard. This study compares the carbon isotope composition(d13C) in its natural abundance in the water‐soluble fractions of the flag leaf blade and the ear with the d13C of mature kernels to assess the relative contribution of both organs to grain filling in durum wheat(Triticum turgidum L. var.durum). The relative contribution of the ear was higher in landraces compared to modern cultivars, as well as in response to nitrogen fertilization and water stress. Such genotypic and environmentally driven differences were associated with changes in harvest index(HI), with the relative contribution of the ear being negatively associated with HI. In the case of the genotypic differences, the lower relative contribution of the ear in modern cultivars compared with landraces is probably associated with the appearance in the former of a certain amount of source limitation driven by a higher HI. In fact, the relative contribution of the ear was far more responsive to changes in HI in modern cultivars compared with landraces.
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关 键 词: | 碳同位素组成 基因型差异 圆锥小麦 籽粒灌浆 耳朵 生长条件 旗叶 硬质 |
Contribution of the ear and the flag leaf to grain filling in durum wheat inferred from the carbon isotope signature: Genotypic and growing conditions effects |
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Authors: | Rut Sanchez-Bragado ;Abdelhalim Elazab ;Bangwei Zhou ;Maria Dolors Serret ;Jordi Bort ;Maria Teresa Nieto-Taladrit ;Jose Luis Araus |
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Institution: | [1]Unit of Plant Physiology, Department of Plant Biology, Faculty of Biology, University of Barcelona, Diagonal 645 08028, Barcelona, Spain; [2]National Institute for Agricultural and Food Research and Technology (INIA), Ctra. de La Coruna Km. 7,5 28040, Madrid, Spain |
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Abstract: | The ear, together with the flag leaf, is believed to play a major role as a source of assimilates during grain filling in C3 cereals. However, the intrusive nature of most of the available methodologies prevents reaching conclusive results in this regard. This study compares the carbon isotope composition (δ13C) in its natural abundance in the water‐soluble fractions of the flag leaf blade and the ear with the δ13C of mature kernels to assess the relative contribution of both organs to grain filling in durum wheat (Triticum turgidum L. var. durum). The relative contribution of the ear was higher in landraces compared to modern cultivars, as well as in response to nitrogen fertilization and water stress. Such genotypic and environmentally driven differences were associated with changes in harvest index (HI), with the relative contribution of the ear being negatively associated with HI. In the case of the genotypic differences, the lower relative contribution of the ear in modern cultivars compared with landraces is probably associated with the appearance in the former of a certain amount of source limitation driven by a higher HI. In fact, the relative contribution of the ear was far more responsive to changes in HI in modern cultivars compared with landraces. |
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Keywords: | Carbon isotope discrimination ear flag leaf grain filling harvest index photosynthesis |
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