[Objective]The aim was to provide scientific basis for breeding on the fruit length of summer squash.[Method]Inheritance of the fruit length of summer squash in P1,P2,F1,B1,B2 and F2 from two crosses q-1 ×23-4G（...[Objective]The aim was to provide scientific basis for breeding on the fruit length of summer squash.[Method]Inheritance of the fruit length of summer squash in P1,P2,F1,B1,B2 and F2 from two crosses q-1 ×23-4G（cross 1） and q-1 ×A-7（cross 2） was investigated by the mixed major gene and polygene inheritance model of quantitative traits.[Result]The results showed that the fruit length was controlled by D2 model;Genetic effect of fruit length of cross 1 was mainly additive effect,but genetic effect of fruit length of cross 2 was mainly dominant effect.Heritability values of the genes of F2 were relatively high and the environmental effect was relatively low.[Conclusion]The fruit length breeding of summer squash should be selected in early generation selection.展开更多
[Objectives]The paper was to verify the genetic mechanism of weight per fruit and fruit length in bitter gourd and to provide guidance for formulating breeding strategy.[Methods]In this study,a cross was made between ...[Objectives]The paper was to verify the genetic mechanism of weight per fruit and fruit length in bitter gourd and to provide guidance for formulating breeding strategy.[Methods]In this study,a cross was made between CN19-1 and Thai4-6,and a Fsegregation population was also constructed.The genetic characteristics of weight per fruit and fruit length were analyzed by employing major gene plus polygene mixed genetic model.[Results]The weight per fruit and fruit length showed continuous distribution in Fsegregation population.The optimal model for weight per fruit and fruit length was the same(A-1 model).The major gene additive effect value of weight per fruit was 46.1474,the dominant effect value was-46.1005,and the major gene heritability was 52.47%.The major gene additive effect value of fruit length was 2.456,the dominant effect value was-2.455,and the major gene heritability was 52.52%.The results showed that weight per fruit and fruit length were mainly controlled by a pair of major genes.[Conclusions]This study can provide a theoretical basis for bitter gourd breeding.展开更多
The fruit shape is important quantitative trait closely related to the fruit quality. However, the genetic model of fruit shapes has not been proposed. Therefore, in the present study, analysis of genetic effects for ...The fruit shape is important quantitative trait closely related to the fruit quality. However, the genetic model of fruit shapes has not been proposed. Therefore, in the present study, analysis of genetic effects for fruit shape traits （fruit length and fruit perimeter） in sponge gourd was conducted by employing a developmental genetic model including fruit direct effects and maternal effects. Analysis approaches of unconditional and conditional variances were applied to evaluate the genetic behavior of fruit shape traits at economical and physiological maturation times. The results of variance analysis indicated that fruit length and fruit perimeter were simultaneously affected by fruit direct genetic effects and maternal effects. Fruit direct genetic effects were relatively more important for fruit shape traits at whole developmental period. The gene expression was most active at the economical maturation stage （1-12 d after flowering） for two shape traits, and the activation of gene was mostly due to direct dominance effects at physiological maturation stage （13-60 datter flowering）. The coefficients due to different genetic effects, as well as the phenotypic correlation coefficients, varied significantly between fruit shape traits themselves at various maturation stages. The results showed that it was relatively easy to improve fruit shape traits for industrial purpose by carefully selecting the parents at economical maturation stage instead of that at physiological maturation stage.展开更多
果形是甜瓜重要的育种目标。果实长度是决定果实形状的重要指标,对其进行遗传分析是进行遗传改良的基础。以长果形厚皮甜瓜自交系551为母本(P_(1))、短果形厚皮甜瓜自交系B22为父本(P_(2)),构建6个基本世代群体(P_(1)、P_(2)、F_(1)、F_...果形是甜瓜重要的育种目标。果实长度是决定果实形状的重要指标,对其进行遗传分析是进行遗传改良的基础。以长果形厚皮甜瓜自交系551为母本(P_(1))、短果形厚皮甜瓜自交系B22为父本(P_(2)),构建6个基本世代群体(P_(1)、P_(2)、F_(1)、F_(2)、BC_(1)P_(1)、BC_(1)P_(2)),采用极大似然法和IECM(iterated expectation and conditional maximization)算法对群体果实长度进行遗传规律分析。结果表明,厚皮甜瓜果实长度是数量性状,遗传模型为2对加性-显性-上位性主基因+加性-显性-上位性多基因。遗传群体BC_(1)P_(1)、BC_(1)P_(2)、F_(2)主基因遗传率分别为86.1188%、100%、60.4821%;多基因遗传率分别为1.5882%、0、29.2478%。上述分析表明,厚皮甜瓜果实长度的主基因遗传率在BC_(1)P_(1)、BC_(1)P_(2)和F_(2)代中较高,厚皮甜瓜果实长度选择在较早的世代中进行,受环境因素影响较小。展开更多
基金Supported by Science and Technology Development Project of Jinan City in2006(064034)~~
文摘[Objective]The aim was to provide scientific basis for breeding on the fruit length of summer squash.[Method]Inheritance of the fruit length of summer squash in P1,P2,F1,B1,B2 and F2 from two crosses q-1 ×23-4G（cross 1） and q-1 ×A-7（cross 2） was investigated by the mixed major gene and polygene inheritance model of quantitative traits.[Result]The results showed that the fruit length was controlled by D2 model;Genetic effect of fruit length of cross 1 was mainly additive effect,but genetic effect of fruit length of cross 2 was mainly dominant effect.Heritability values of the genes of F2 were relatively high and the environmental effect was relatively low.[Conclusion]The fruit length breeding of summer squash should be selected in early generation selection.
基金Hainan Science and Technology Project(ZDYF2020229,ZDKJ2021010)Scientific Research Program of Hainan Key Laboratory of Vegetable Biology and Hainan Key Laboratory for Quality Regulation of Tropical Horticultural Crops[HNZDSYS(YY)-03]。
文摘[Objectives]The paper was to verify the genetic mechanism of weight per fruit and fruit length in bitter gourd and to provide guidance for formulating breeding strategy.[Methods]In this study,a cross was made between CN19-1 and Thai4-6,and a Fsegregation population was also constructed.The genetic characteristics of weight per fruit and fruit length were analyzed by employing major gene plus polygene mixed genetic model.[Results]The weight per fruit and fruit length showed continuous distribution in Fsegregation population.The optimal model for weight per fruit and fruit length was the same(A-1 model).The major gene additive effect value of weight per fruit was 46.1474,the dominant effect value was-46.1005,and the major gene heritability was 52.47%.The major gene additive effect value of fruit length was 2.456,the dominant effect value was-2.455,and the major gene heritability was 52.52%.The results showed that weight per fruit and fruit length were mainly controlled by a pair of major genes.[Conclusions]This study can provide a theoretical basis for bitter gourd breeding.
基金Project supported by the National Natural Science Foundation of China (No.30370911)the Science and Technology Department of Zhejiang Province (No.2005C32001),China
文摘The fruit shape is important quantitative trait closely related to the fruit quality. However, the genetic model of fruit shapes has not been proposed. Therefore, in the present study, analysis of genetic effects for fruit shape traits （fruit length and fruit perimeter） in sponge gourd was conducted by employing a developmental genetic model including fruit direct effects and maternal effects. Analysis approaches of unconditional and conditional variances were applied to evaluate the genetic behavior of fruit shape traits at economical and physiological maturation times. The results of variance analysis indicated that fruit length and fruit perimeter were simultaneously affected by fruit direct genetic effects and maternal effects. Fruit direct genetic effects were relatively more important for fruit shape traits at whole developmental period. The gene expression was most active at the economical maturation stage （1-12 d after flowering） for two shape traits, and the activation of gene was mostly due to direct dominance effects at physiological maturation stage （13-60 datter flowering）. The coefficients due to different genetic effects, as well as the phenotypic correlation coefficients, varied significantly between fruit shape traits themselves at various maturation stages. The results showed that it was relatively easy to improve fruit shape traits for industrial purpose by carefully selecting the parents at economical maturation stage instead of that at physiological maturation stage.
文摘果形是甜瓜重要的育种目标。果实长度是决定果实形状的重要指标,对其进行遗传分析是进行遗传改良的基础。以长果形厚皮甜瓜自交系551为母本(P_(1))、短果形厚皮甜瓜自交系B22为父本(P_(2)),构建6个基本世代群体(P_(1)、P_(2)、F_(1)、F_(2)、BC_(1)P_(1)、BC_(1)P_(2)),采用极大似然法和IECM(iterated expectation and conditional maximization)算法对群体果实长度进行遗传规律分析。结果表明,厚皮甜瓜果实长度是数量性状,遗传模型为2对加性-显性-上位性主基因+加性-显性-上位性多基因。遗传群体BC_(1)P_(1)、BC_(1)P_(2)、F_(2)主基因遗传率分别为86.1188%、100%、60.4821%;多基因遗传率分别为1.5882%、0、29.2478%。上述分析表明,厚皮甜瓜果实长度的主基因遗传率在BC_(1)P_(1)、BC_(1)P_(2)和F_(2)代中较高,厚皮甜瓜果实长度选择在较早的世代中进行,受环境因素影响较小。
