Quantifying source-sink relationships in leaf-color modified rice genotypes during grain filling  

作　　者：Zhenxiang Zhou Paul CStruik Junfei Gu Peter E.L.van der Putten Zhiqin Wang Jianchang Yang Xinyou Yin 

机构地区：[1]Centre for Crop Systems Analysis,Department of Plant Sciences,Wageningen University&Research,Wageningen 6700 AK,The Netherlands [2]College of Agriculture,Yangzhou University,Yangzhou 225009,China

出　　处：《Journal of Integrative Agriculture》2024年第9期2923-2940,共18页农业科学学报（英文版）

摘　　要：Leaf-color modification can affect canopy photosynthesis,with potential effects on rice yield and yield components.Modulating source-sink relationships through crop management is often used to improve crop productivity.This study investigated whether and how modifying leaf color alters source-sink relationships and whether current crop cultivation practices remain applicable for leaf-color modified genotypes.Periodically collected data of total biomass and nitrogen(N)accumulation in rice genotypes of four genetic backgrounds and their leaf-color modified variants(greener or yellower)were analyzed,using a recently established modelling method to quantify the source-sink(im)balance during grain filling.Among all leaf-color variants,only one yellower-leaf variant showed a higher source capacity than its normal genotype.This was associated with greater post-flowering N-uptake that prolonged the functional leaf-N duration,and this greater post-flowering N-uptake was possible because of reduced pre-flowering N-uptake.A density experiment showed that current management practices(insufficient planting density accompanied by abundant N application)are unsuitable for the yellower-leaf genotype,ultimately limiting its yield potential.Leaf-color modification affects source-sink relationships by regulating the N trade-off between pre-and post-flowering uptake,as well as N translocation between source and sink organs.To best exploit leaf-color modification for improving crop productivity,adjustments of crop management practices are required.

关 键 词：source-sink relationship biomass nitrogen Oryza sativa leaf-color modification 

分 类 号：S511[农业科学—作物学]