Pl. Scheeren et al., RESPONSES OF WHEAT TO LOW-LUMINOSITY STRE SS AND THEIR RELATIONS WITHGENETIC BREEDING, Pesquisa agropecuaria brasileira, 32(12), 1997, pp. 1287-1293
The work was carried out at the Estacao Experimental Agronomica of UFR
GS, in Eldorado do Sul, Rio Grande do Sul, Brazil, in 1988. The object
ive was to investigate the influence of low luminosity stress (60% of
incident natural light) on six traits in four wheat (IFS 20-Iassul, IA
C 5-Maringa Trigo BR 34 e PF 84431) genotypes and on their correspondi
ng F-2 segregating populations (six combinations). When the treatments
with and without low luminosity stress were compared, a differentiate
d behaviour of the parents, as well as of the F-2 segregating populati
ons, was observed for all traits assessed. According to this work, evi
dences indicate that there are greater possibilities of success in imp
roving the main traits involved in wheat yield components if plant sel
ection is made in an environment that favors phenotypic expression of
its genetic potencial, that is, in an environment without stress.