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,fac...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.展开更多
Dear Editor,Wheat grain number,determined by spikelet number and floret fruiting efficiency,is a key determinant of yield.Normally,a wheat spike bears 16-28 spikelets(Niu et al.,2023),each forming up to 10 florets.How...Dear Editor,Wheat grain number,determined by spikelet number and floret fruiting efficiency,is a key determinant of yield.Normally,a wheat spike bears 16-28 spikelets(Niu et al.,2023),each forming up to 10 florets.However,less than half of the florets successfully set grains,and each fertile floret produces a single grain(Guo and Schnurbusch,2015).First described in 1983,the tri-pistil wheat(TP1)(Chen et al.,1983),also known as tri-grain or multi-ovary wheat(Wang et al.,2009),is remarkable for its exceptional floret fruiting efficiency.Each floret develops three pistils without any defects in other floral organs,consequently forming three tightly packed grains after fertilization.The TP locus has been mapped to chromosome 2D(Yang et al.,2017;Mahlandt et al.,2021).However,the causative gene remains unidentified,and its molecular mechanism is still unknown.展开更多
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+1 种基金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)
文摘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.
基金This work was supported by the National Natural Science Foundation of China(no.32372138 to J.N.).
文摘Dear Editor,Wheat grain number,determined by spikelet number and floret fruiting efficiency,is a key determinant of yield.Normally,a wheat spike bears 16-28 spikelets(Niu et al.,2023),each forming up to 10 florets.However,less than half of the florets successfully set grains,and each fertile floret produces a single grain(Guo and Schnurbusch,2015).First described in 1983,the tri-pistil wheat(TP1)(Chen et al.,1983),also known as tri-grain or multi-ovary wheat(Wang et al.,2009),is remarkable for its exceptional floret fruiting efficiency.Each floret develops three pistils without any defects in other floral organs,consequently forming three tightly packed grains after fertilization.The TP locus has been mapped to chromosome 2D(Yang et al.,2017;Mahlandt et al.,2021).However,the causative gene remains unidentified,and its molecular mechanism is still unknown.
