Is the relationship between grain number and spike dry weight linear?Insights from larger spikes in wheat  

作　　者：Román A.Serrago Constanza S.Carrera Roxana Savin Gustavo A.Slafer 

机构地区：[1]Cátedra de Cerealicultura and CONICET,Departamento de Producción Vegetal,Facultad de Agronomía,Universidad de Buenos Aires,Av.San Martin 4453,Buenos Aires C1417DSE,Argentina [2]Department of Agricultural and Forest Sciences and Engineering,University of Lleida-AGROTECNIO-CERCA Center,Av.Rovira Roure 191,Lleida 25198,Spain [3]ICREA,Catalonian Institution for Research and Advanced Studies,Barcelona 08010,Spain

出　　处：《The Crop Journal》2025年第2期636-640,共5页作物学报(英文版)

基　　金：mainly funded by the State Research Agency of Spain through the Competitive Project PID2021-127415OB-I00 on "Spike fertility in wheat" with some contribution from an AGROTECNIO Seed-funding on "Analysing the physiology of spike density to provide support to selection in breeding programs";RAS did part of the work in this project during a research stay at the Crop Physiology Lab of the University of Lleida co-funded by AUIP (Postgraduate Iberoamerican University Association) grants;core funds Crop Physiology Lab of the Ud L. CSC held a Maria Zambrano’s fellowship from the University of Lleida funded by the Spanish Ministry of Universities and the European Social Fund and is a member of CONICET (the Scientific Research Council of Argentina);INTA (the National Institute of Agriculture Technology of Argentina)

摘　　要：Grain yield variation has been associated to variation in grain number per unit area(GN).It has been shown in the last about 40 years that GN is linearly associated to the spike dry weight(SDW)at anthesis in wheat,fact that has been useful to understand mechanistically potential grain yield.Fruiting efficiency(FE,grains per gram of spike dry weight),the slope between GN and SDW relationship,has been proposed as a possible trait to improve wheat yield potential.The linear relationship between GN and SDW implies a constant increase in GN per unit increase in spike growth and,then a constant FE.However,there are empirical and theoretical elements suggesting that this relationship would not be linear.In this study,we hypothesised and showed that the linearity of the relationship between GN and SDW would be non-linear for extreme values of SDW,implying that the FE would be noticeably reduced at these extreme cases of dry matter allocation to the juvenile spikes.These results have implications for both,genetic and management improvements in grain yield.

关 键 词：WHEAT Grain number Spike dry weight Fruiting efficiency 

分 类 号：S512.1[农业科学—作物学]