Semi-dwarfing (Rht-B1b) Improves Nitrogen-use Efficiency in Wheat, but not at Economically Optimal Levels of Nitrogen Availability

被引：0
作者：
S. Loddo
M. J. Gooding
机构：
[1] University of Padova,Department of Environmental Agronomy and Crop Sciences
[2] University of Reading,Crops Research Unit
来源：
Cereal Research Communications | 2012年 / 40卷
关键词：
wheat; fertilisation; nitrogen-use efficiency; dwarfing alleles;
D O I：
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学科分类号：
摘要：
A U.K. field experiment compared a complete factorial combination of three backgrounds (cvs Mercia, Maris Huntsman and Maris Widgeon), three alleles at the Rht-B1 locus as Near Isogenic Lines (NILs: rht-B1a (tall), Rht-B1b (semi-dwarf), Rht-B1c (severe dwarf)) and four nitrogen (N) fertilizer application rates (0, 100, 200 and 350 kg N/ha). Linear+exponential functions were fitted to grain yield (GY) and nitrogen-use efficiency (NUE; GY /available N) responses to N rate. Averaged over N rate and background Rht-B1b conferred significantly (P < 0.05) greater GY, NUE, N uptake efficiency (NUpE; N in above ground crop / available N) and N utilization efficiency (NUtEg; GY/N in above ground crop) compared with rht-B1a and Rht-B1c. However the economically optimal N rate (Nopt) for N:grain price ratios of 3.5:1 to 10:1 were also greater for Rht-B1b, and because NUE, NUpE and NUtE all declined with N rate, Rht-Blb failed to increase NUE or its components at Nopt. The adoption of semi-dwarf lines in temperate and humid regions, and the greater N rates that such adoption justifies economically, greatly increases land-use efficiency but not necessarily NUE.
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页码：116 / 121
页数：5
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