Physiology and genetics of wheat spike fruiting efficiency in two DH populations adapted to the central producing area of Argentina.

PRETINI NICOLE; TERRILE IGNACIO; GAZABA LUCIANA; DONAIRE GUILLERMO; VANZETTI, LEONARDO; GONZÁLEZ FG

Simposio; 5th International plant phenotyping symposium.; 2018

Spike fruiting efficiency (FE) is a promising trait to improve wheat potential yield (1). It is defined as the grain number produced per unit spike dry weight at anthesis (SDWa) (2). Generally, it is estimated as the grain number produced per unit of no-grain spike dry weight at harvest (FEh). As FE includes the fertile floret number at anthesis and grain set, we defined a simpler trait, the fertile floret number produced per unit SDWa (FEa). Our objective was (i) to determine the correlation among FE?s different measurements and their narrow sense heritability (H2), and (ii) to identify possible QTLs for them. Two DH populations, B19 x B200 (n= 102, P1) and B11 x B2002 (n= 81, P2) were grown in four/five environments under field/greenhouse. The correlation FEa vs. FE (r=0.66-0.60, p