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

被引：9

作者：

Loddo, S. ^{[2
]}

Gooding, M. J. ^{[1
]}

机构：

[1] Univ Reading, Crops Res Unit, Reading RG6 6AR, Berks, England

[2] Univ Padua, Dept Environm Agron & Crop Sci, I-35020 Padua, Italy

来源：

CEREAL RESEARCH COMMUNICATIONS | 2012年 / 40卷 / 01期

关键词：

wheat; fertilisation; nitrogen-use efficiency; Rht; dwarfing alleles; CULTIVARS;

D O I：

10.1556/CRC.40.2012.1.13

中图分类号：

S3 [农学（农艺学）];

学科分类号：

0901 ;

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.

引用

页码：116 / 121

页数：6

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