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- W2079070003 abstract "ABSTRACT A field trial was conducted to investigate the effect of nitrogen (N) application on redistribution and transformation of photosynthesized 14C during grain formation in two maize (Zea mays L.) cultivars with different senescence appearance, 14CO2 was introduced to ear leaf of maize at vegetative growth stage and grain-filling stage, respectively, the 14C-distribution to respired CO2, vegetative mass and grain as well as to crude chemical components including sugar, polysaccharide, organic acids, amino and protein in ear leaf of maize and grain at grain-filling stage was determined. Two maize hybrids included “Danyu 13”, an early senescence hybrid, and “Zhongdan 306”, a stay-green hybrid. There were four N treatments: [1] Thomas, H. and Smart, C. M. 1993. Crops That Stay Green.. Ann. Appl. Biol., 123: 193–219. [Crossref], [Web of Science ®] , [Google Scholar] N1: 0 kg N ha−1; [2] Bekavac, G. 1998. Path Analysis of Stay-Green Trait in Maize.. Cereal Res. Commun., 26: 161–167. [Crossref], [Web of Science ®] , [Google Scholar] N2: 250 kg N ha−1 (1/5 N as basal application and 4/5 N as top-dressing at stalk elongation stage only); [3] Cliquet, J. B., Deleens, E., Bousser, A., Martin, M., Lescure, J. C., Prioul, J. L., Mariotti, A. and Morot-Gaudry, J. F. 1990. Estimation of Carbon and Nitrogen Allocation During Stalk Elongation By13C and15N Tracking in Zea mays L.. Plant Physiol., 92: 79–87. [Crossref], [PubMed], [Web of Science ®] , [Google Scholar] N3: 250 kg N ha−1 (1/5 N as basal, 2/5 N as top-dressing at stalk elongation stage and tasselling stage, respectively); [4] Tanaka, A. and Osaki, M. 1983. Growth and Behaviour of Photosynthesized14C Various Crops in Relation to Production.. Soil Sci. Plant Nutr., 29: 147–158. [Taylor & Francis Online], [Web of Science ®] , [Google Scholar] N4: 400 kg N ha−1 (1/5 N as basal and 4/5 N as top-dressing at stalk elongation stage). For Zhongdan 306, a higher grain yield was ascribed to the less respiratory loss of C, larger translocation of current photosynthesized C during ripening, and smaller translocation of C existed in vegetative mass, while grain formation for Danyu 13 depended upon the larger translocation of C existed in vegetative mass and smaller translocation of current photosynthesized C during ripening. Percentage of photosynthetically fixed 14C distributed in both sugar and polysaccharide in ear leaf and grain for Zhongdan 306 was significantly larger than Danyu 13, while that in organic acids, amino and protein for Zhongdan 306 were markedly smaller than Danyu 13. The highest percentage of 14C distributed in sugar, the main carbohydrate translocated from leaf to grain, could be achieved in N3 treatment for Zhongdan 306 and in N2 treatment for Danyu 13, respectively, which consequently benefited to grain formation. This distribution of photosynthesized 14C between C-pool and N-pool may be related to the ratio of sucrose phosphate synthase (SPS) to phospho enol pyruvate carboxylase (PEPC) in leaf of maize at grain-filling stage." @default.
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- W2079070003 date "2002-09-01" @default.
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- W2079070003 title "EFFECT OF NITROGEN APPLICATION ON REDISTRIBUTION AND TRANSFORMATION OF PHOTOSYNTHESIZED<sup>14</sup>C DURING GRAIN FORMATION IN TWO MAIZE CULTIVARS WITH DIFFERENT SENESCENCE APPEARANCE" @default.
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- W2079070003 doi "https://doi.org/10.1081/pln-120014706" @default.
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