Genetic Variations in Growth Traits and Early Selection of Cunninghamia lanceolata var.Luotian Progeny Test
Abstrat:The unique morphological characteristics of Cunninghamia lanceolata var.Luotian make it an ideal plant type for forest trees,with high economic use value and great prospect for promotion and application,but its offspring determination is not perfect,and the genetic parameters of each trait are unknown,which is not conducive to the genetic improvement of C.lanceolata var.Luotian.In this study,the genetic variation of C.lanceolata var.Luotian was analyzed,so as to carry out the early selection of excellent lineages,in order to provide a theoretical basis for the conservation and selective breeding of weeping cedar germplasm resources.C.lanceolata var.Luotian was used as materials in this study,the growth differences and genetic rules of 3 a and 4a tree height(TH)and diameter of breast height(DBH)different families were compared and analyzed,and the early selection of excellent family lines was carried out.The results showed that the average TH and DBH of 3a in the offspring were 3.11 m and 4.07 cm,and the average TH and DBH of 4a were 4.16 m and 5.35 cm,respectively.There were significant differences in growth traits between families at 3a and 4a(P＜0.01).The phenotypic coefficient of variation ranged from 26.24％-41.83％,the genetic coefficient of variation was 5.37％-9.15％,the heritability range was 0.31-0.43 per plant,and the heritability range was 0.61-0.70 in the family lineage,all of which were controlled by a moderate degree of genetics.Among the different source families,the growth traits of the semi-sibling family of P.weeping were good,and the growth traits were maximum.According to the 15％enrollment rate,five excellent families were selected,namely 1-17,1-21,1-20,2-3 and 3-6,and the average values of the selection were 3.43 m(3a TH),4.74 cm(3a DBH),4.64 m(4a TH)and 6.20 cm(4a DBH),were and the average genetic gain were 6.71％,10.25％,7.92％and 11.13％,respectively.The excellent family line bred can provide excellent germplasm material for the protection of weeping cedar germplasm resources and selective breeding.
Cunninghamia lanceolata var.Luotiangrowth traitsgenetic variationsearly selectionprogeny test
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