兰州大学机构库
Increased grain yield in modern genotypes of spring wheat for dryland cultivation in northwest China is associated with the decreased allocation of carbon to roots
Feng, Tao1; Zhu, Yong-He2; Chai, Ning3; Zhang, Xin-Tan2; Du, Yan-Lei3; Turner, Neil C.3,4,5; Du, Pengzhen3; Li, Feng-Min2,3
2023-11-01
Online publication date2023-09
Source PublicationFIELD CROPS RESEARCH   Impact Factor & Quartile
ISSN0378-4290 ; 1872-6852
Volume303
page numbers11
AbstractThe increase in wheat yield in modern cultivars compared with landraces previously grown by dryland farmers in northwest China is associated with a decrease in aboveground vegetative growth. It is not clear whether the reduction in aboveground growth is associated with increased or decreased root growth and carbon allocation. Using genotypes of wheat released over the last 125 years, we evaluated the changes in belowground biomass, structure and activity as the grain yield increased with modern genotypes. Fourteen spring wheat genotypes released in different eras were selected to study the relationships between root traits and grain yield in two dryland environments in northwest China. In the field, root biomass, root-to-shoot ratio, and root length density decreased, while specific root length and water uptake per unit root biomass increased as the grain yield increased in later-released genotypes. Leaf C-13 pulse labeling was applied to six representative genotypes at the stem elongation and early grain-filling stages to measure the distribution of assimilated carbon between shoots, roots, the root rhizosphere, and losses by root respiration. The labeling with C-13 showed that at stem elongation and early grain filling, the proportion of C-13-labeled dry matter allocated to aboveground biomass increased, and that allocated to roots decreased as grain yield increased with the later release of the genotypes. At stem elongation, across all genotypes 55% (genotypic range 46-66%) of the C-13 was in the shoot biomass and 19% (13-25%) was used to build root biomass, while 16% (13-19%) was lost as root and soil respiration and 10% (8-11%) was in the root rhizosphere. At the grain filling stage, 75% (68-80%) of the C-13 was in the shoots, 7% (5-9%) was in the roots, 12% (9-15%) was used for root and soil respiration, and 6% (5-7%) was in the root rhizosphere. In the modern high-yielding genotypes, a lower percentage of C-13 was translocated to the roots, secreted into the rhizosphere and lost by root respiration than in the landraces. While crop breeders do not actively select and breed for root characteristics, we conclude that breeding and selection for higher-yielding genotypes of spring wheat in northwest China has inadvertently selected for smaller but more efficient root systems that have contributed to higher grain yield in the rainfed environment of the study region. The implications of this biomass distribution for grain yield in other dryland environments are discussed.
KeywordSpring wheat Root characteristics Photosynthetic C allocation C-13 pulse labeling Root respiration Root rhizodeposition
PublisherELSEVIER
DOI10.1016/j.fcr.2023.109114
Indexed BySCIE
Language英语
WOS Research AreaAgriculture
WOS SubjectAgronomy
WOS IDWOS:001069564000001
Original Document TypeArticle
Citation statistics
Document Type期刊论文
Identifierhttps://ir.lzu.edu.cn/handle/262010/568337
Collection兰州大学
Corresponding AuthorDu, Pengzhen; Li, Feng-Min
Affiliation
1.Northwest Normal Univ, Coll Chem & Chem Engn, Key Lab Ecofunct Polymer Mat, Key Lab Ecoenvironm Polymer Mat Gansu Prov,Minist, Lanzhou 730070, Peoples R China;
2.Nanjing Agr Univ, Coll Agr, Collaborat Innovat Ctr Modern Crop Prod Cosponsore, Nanjing 210095, Peoples R China;
3.Lanzhou Univ, Coll Ecol, State Key Lab Grassland Agroecosystems, Lanzhou 730000, Peoples R China;
4.Univ Western Australia, UWA Inst Agr, Crawley, WA 6009, Australia;
5.Univ Western Australia, Sch Agr & Environm, Crawley, WA 6009, Australia
Recommended Citation
GB/T 7714
Feng, Tao,Zhu, Yong-He,Chai, Ning,et al. Increased grain yield in modern genotypes of spring wheat for dryland cultivation in northwest China is associated with the decreased allocation of carbon to roots[J]. FIELD CROPS RESEARCH,2023,303.
APA Feng, Tao.,Zhu, Yong-He.,Chai, Ning.,Zhang, Xin-Tan.,Du, Yan-Lei.,...&Li, Feng-Min.(2023).Increased grain yield in modern genotypes of spring wheat for dryland cultivation in northwest China is associated with the decreased allocation of carbon to roots.FIELD CROPS RESEARCH,303.
MLA Feng, Tao,et al."Increased grain yield in modern genotypes of spring wheat for dryland cultivation in northwest China is associated with the decreased allocation of carbon to roots".FIELD CROPS RESEARCH 303(2023).
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