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

Journal of Integrative Agriculture 2024年第9期23卷 2923-2940页

作者： Zhenxiang Zhou paul cstruik Junfei Gu Peter E.L.van der Putten Zhiqin Wang Jianchang Yang Xinyou Yin Centre for Crop Systems Analysis Department of Plant SciencesWageningen University&ResearchWageningen 6700 AKThe Netherlands College of Agriculture Yangzhou UniversityYangzhou 225009China

Leaf-color modification can affect canopy photosynthesis,with potential effects on rice yield and yield *** source-sink relationships through crop management is often used to improve crop *** study investigated whether and how modifying leaf color alters source-sink relationships and whether current crop cultivation practices remain applicable for leaf-color modified *** 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 *** all leaf-color variants,only one yellower-leaf variant showed a higher source capacity than its normal *** 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 ***-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 *** 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

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Responses of Lowland, Upland and Aerobic Rice Genotypes to Water Limitation During Different Phases

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Rice science 2020年第4期27卷 345-354页

作者： Preethi VIJAYARAGHAVAREDDY YIN Xinyou paul cstruik Udayakumar MAKARLA Sheshshayee SREEMAN Department of Crop Physiology University of Agricultural SciencesBengaluru 560065India Centre for Crop Systems Analysis Wageningen University&ResearchPO Box 4306700AK Wageningenthe Netherlands

Rice yield reduction due to water limitation depends on its severity and duration and on the phenological stage of its *** exposed three contrasting rice genotypes,IR64,UPLRi7 and Apo(adapted to lowland,upland and aerobic conditions,respectively),to three water regimes(puddle,100%and 60%field capacity)in pots during the vegetative(GSI),flowering(GSII)and grain filling(GSIII)*** at all the three stages significantly reduced yield especially in lowland genotype *** of water limitation was more severe at GSII than at the other two *** at GSI stage reduced both source activity(leaf area and photosynthetic rate)and sink capacity(tiller number or panicle number per pot).When stress was imposed at GSII,spikelet fertility was most affected in all the three *** both GSII and GSIII,although leaf area was constant in all the three water regimes,estimated relative whole-plant photosynthesis was strongly associated with yield *** photosynthesis due to stress at any given stage was found to have direct impact on *** to the other genotypes,Apo had deeper roots and maintained a better water relation,thus,higher carbon gain and spikelet viability,and ultimately,higher biomass and productivity under water-limited ***,screening for these stage-dependent adaptive mechanisms is crucial in breeding for sustained rice production under water limitation.

关键词： water limitation phenology upland aerobic Oryza sativa yield

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