Water management is an important practice that affects fruit size and quality.Effective implementation of irrigation scheduling requires knowledge of the appropriate indicators and thresholds,which are established man...Water management is an important practice that affects fruit size and quality.Effective implementation of irrigation scheduling requires knowledge of the appropriate indicators and thresholds,which are established manly based on the effects of water deficits on final fruit quality.Few studies have focused on the real-time effects of water status on fruit and shoot growth.To establish soil water potential (ψ_(soil)) thresholds to trigger irrigation of peach at pivotal fruit developmental stages,photogrammetry,^(13)C labelling,and other techniques were used in this study to investigate real-time changes in stem diameter,fruit projected area,net leaf photosynthetic rate (P_(n)),and allocation of photoassimilates to fruit under soil water potential conditions ranging from saturation to stress in 6-year-old Shimizu hakuto’peach.Stem growth,fruit growth,and P_n exhibited gradually decreasing sensitivity to water deficits during fruit developmental stages I,II,and III.Stem diameter growth was significantly inhibited whenψ_(soil)dropped to-8.5,-7.6,and-5.4 k Pa,respectively.Fruit growth rate was low,reaching zero when theψ_(soil)was-9.0 to-23.1,-14.9 to-21.4,and-16.5 to-23.3 k Pa,respectively,and P_ndecreased significantly when theψ_(soil)reached-24.2,-22.7,and-20.4 kPa,respectively.In addition,more photoassimilates were allocated to fruit under moderateψ_(soil)conditions (-10.1 to-17.0 k Pa) than under otherψ_(soil)values.Our results revealed threeψ_(soil)thresholds,-10.0,-15.0,and-15.0 kPa,suitable for triggering irrigation during stages I,II,and III,respectively.These thresholds can be helpful for controlling excessive tree vigor,maintaining rapid fruit growth and leaf photosynthesis,and promoting the allocation of more photoassimilates to fruit.展开更多
Through the investigation of the current production situation,regional distribution,variety structure,production organization and existing problems of table grapes in Henan Province,this paper conducted an in-depth an...Through the investigation of the current production situation,regional distribution,variety structure,production organization and existing problems of table grapes in Henan Province,this paper conducted an in-depth analysis on the advantages and disadvantages of the development of table grapes industry in Henan Province.In view of the current problems and development trend,it came up with some pertinent recommendations,including transforming the concept of cultivation,adhering to the principle of"high-quality varieties,standardized cultivation,mechanized management,large-scale operation,and diversified market",strengthening brand building,and promote the integrated development of the primary,secondary and tertiary industries,so as to promote the change of table grape industry in Henan Province from"quantitative scale model"to"quality benefit model",and promote its sustainable and high-quality development.展开更多
基金supported by the projects of China Agriculture Research System of MOF and MARA (Grant No.CARS-29-ZP-7)Outstanding Youth Science and Technology Fund of Henan Academy of Agricultural Sciences (Grant No.2022YQ08)。
文摘Water management is an important practice that affects fruit size and quality.Effective implementation of irrigation scheduling requires knowledge of the appropriate indicators and thresholds,which are established manly based on the effects of water deficits on final fruit quality.Few studies have focused on the real-time effects of water status on fruit and shoot growth.To establish soil water potential (ψ_(soil)) thresholds to trigger irrigation of peach at pivotal fruit developmental stages,photogrammetry,^(13)C labelling,and other techniques were used in this study to investigate real-time changes in stem diameter,fruit projected area,net leaf photosynthetic rate (P_(n)),and allocation of photoassimilates to fruit under soil water potential conditions ranging from saturation to stress in 6-year-old Shimizu hakuto’peach.Stem growth,fruit growth,and P_n exhibited gradually decreasing sensitivity to water deficits during fruit developmental stages I,II,and III.Stem diameter growth was significantly inhibited whenψ_(soil)dropped to-8.5,-7.6,and-5.4 k Pa,respectively.Fruit growth rate was low,reaching zero when theψ_(soil)was-9.0 to-23.1,-14.9 to-21.4,and-16.5 to-23.3 k Pa,respectively,and P_ndecreased significantly when theψ_(soil)reached-24.2,-22.7,and-20.4 kPa,respectively.In addition,more photoassimilates were allocated to fruit under moderateψ_(soil)conditions (-10.1 to-17.0 k Pa) than under otherψ_(soil)values.Our results revealed threeψ_(soil)thresholds,-10.0,-15.0,and-15.0 kPa,suitable for triggering irrigation during stages I,II,and III,respectively.These thresholds can be helpful for controlling excessive tree vigor,maintaining rapid fruit growth and leaf photosynthesis,and promoting the allocation of more photoassimilates to fruit.
基金Characteristic Forest and Fruit Special Project of Science and Technology Support Action Plan for"Regional Distribution,Large-scale Operation,Standardized Production,and Industrialized Development of High-quality Wheat,Peanuts,Grass and Livestock,Fruits and Vegetable Industries in Henan Province(202004)Project for Co-construction of Modern Agriculture Comprehensive Demonstration County between Henan Academy of Agricultural Sciences and the Counties(Yu Nong Ke[2021]No.30).
文摘Through the investigation of the current production situation,regional distribution,variety structure,production organization and existing problems of table grapes in Henan Province,this paper conducted an in-depth analysis on the advantages and disadvantages of the development of table grapes industry in Henan Province.In view of the current problems and development trend,it came up with some pertinent recommendations,including transforming the concept of cultivation,adhering to the principle of"high-quality varieties,standardized cultivation,mechanized management,large-scale operation,and diversified market",strengthening brand building,and promote the integrated development of the primary,secondary and tertiary industries,so as to promote the change of table grape industry in Henan Province from"quantitative scale model"to"quality benefit model",and promote its sustainable and high-quality development.
