Acclimation of leaf nitrogen to vertical light gradient at anthesis in wheat is a whole-plant process that scales with the size of the canopy.
نویسندگان
چکیده
Vertical leaf nitrogen (N) gradient within a canopy is classically considered as a key adaptation to the local light environment that would tend to maximize canopy photosynthesis. We studied the vertical leaf N gradient with respect to the light gradient for wheat (Triticum aestivum) canopies with the aims of quantifying its modulation by crop N status and genetic variability and analyzing its ecophysiological determinants. The vertical distribution of leaf N and light was analyzed at anthesis for 16 cultivars grown in the field in two consecutive seasons under two levels of N. The N extinction coefficient with respect to light (b) varied with N supply and cultivar. Interestingly, a scaling relationship was observed between b and the size of the canopy for all the cultivars in the different environmental conditions. The scaling coefficient of the b-green area index relationship differed among cultivars, suggesting that cultivars could be more or less adapted to low-productivity environments. We conclude that the acclimation of the leaf N gradient to the light gradient is a whole-plant process that depends on canopy size. This study demonstrates that modeling leaf N distribution and canopy expansion based on the assumption that leaf N distribution parallels that of the light is inappropriate. We provide a robust relationship accounting for vertical leaf N gradient with respect to vertical light gradient as a function of canopy size.
منابع مشابه
Acclimation of Leaf Nitrogen to Vertical Light Gradient at Anthesis in Wheat Is a Whole-Plant Process That Scales with the Size of the Canopy1[W][OA]
Institut National de la Recherche Agronomique, Unité Mixte Recherche 1095 Genetics, Diversity, and Ecophysiology of Cereals, F–63039 Clermont-Ferrand, cedex 02, France (D.M., V.A., J.L.G., P.M.); Blaise Pascal University, Unité Mixte Recherche 1095 Genetics, Diversity, and Ecophysiology of Cereals, F–63170 Aubiere, France (D.M., V.A., J.L.G., P.M.); and Division of Plant and Crop Sciences, Scho...
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ورودعنوان ژورنال:
- Plant physiology
دوره 160 3 شماره
صفحات -
تاریخ انتشار 2012