[Genetic potential and selection index of yield-related traits in 2-year-old licorice (Glycyrrhiza uralensis) populations].
OBJECTIVE
To evaluate genetic potential and selection index of yield-related traits in 2-year-old populations, and provide a basis for high-yield breeding of licorice (Glycyrrhiza uralensis).


METHODS
Four genotype licorice populations were transplanting in four different environment using complete randomized block design with three replication, and the 10 yield-related traits, including plant height (PH), stem diameter (SD), tiller number (TN), taproot length (TRL), root length (RL), root diameter (RD), diameter of 20 cm below the root head (D20), taperingness (TR), lateral root number (LRN) and root fresh weight (RFW) were measured in field. Genetic potential and selection index of yield-related traits were evaluated using theories of quantitative genetics.


RESULTS
The genetic potential were higher for the three traits of PH (X1), TRL (X4) and RL (X5) that showed through genetic parameter of broad sense heritability (h2), genetic variation coefficient (GCV) and relative genetic advance (RGA). Among them, selection relative value increased by 45.94% through combination of PH and RL (Y1 = 0.21X1 + 0.08X5) compared with the direct selection for RFW (Y1).


CONCLUSIONS
It can realize effective indirectly selection for yield traits, RFW of licorice by PH and RL or their combination. That is, for selection of high-yield licorice, select big and high plants firstly, and then single out long root length materials.
Fu-Lai
FL
Yu
Zhi-Gang
ZG
Zhao
Wen-Quan
WQ
Wang
Jun-Ling
JL
Hou
Dan
D
Wang
Yu-Xin
YX
Pang
D000704:Analysis of Variance; D001947:Breeding / Q000379:methods*; D004777:Environment; D029882:Glycyrrhiza uralensis / Q000235:genetics* / Q000254:growth & development; D010641:Phenotype; D018517:Plant Roots / Q000254:growth & development; D018547:Plant Stems / Q000254:growth & development; D040641:Quantitative Trait Loci; D019655:Quantitative Trait, Heritable