Effect of GA on the germinability of Buglossoides arvensis L seed progeny under contrasting maternal nitrogen levels

LONGÁS, MARÍA DE LAS MERCEDES; SUPICICHE, MARÍA LAURA; CHANTRE, GUILLERMO RUBÉN; SABBATINI, MARIO RICARDO

Rosario

Congreso; II Congreso Argentino de Malezas (ASACIM): Malezas 2018. Ciencia, producción y sociedad: hacia un manejo sustentable.; 2018

Asociación Argentina de Ciencia de las Malezas (ASACIM)

Maternal nitrogen level during seed formation influence seed dormancy and germination of the seed progeny. Buglossoides arvensis L. shows non-deep physiological dormancy regulated by ABA-GA balance. The aim of the present work was to evaluate the effect of exogenous GA3 and its inhibitor (Paclobutrazol) on the germinability of Buglossoides arvensis L. F2 seed progeny obtained under contrasting maternal nitrogen levels (Sn, 0 kg N ha-1 and Cn, 150 kg N ha-1). A F2 progeny was tested under GA3 and Paclobutrazol gradients at 7, 15 and 20 °C during 30 days. Dose-response curves were fitted and curve parameters compared by ANOVA. F2 fertilized accessions showed higher germination percentages at different incubation temperatures. For both accessions the germination percentages increased with GA3 concentration. However, no statistical differences among Sn and Cn were observed. For both accessions, germination was statistical reduced by paclobutrazol. At 7 °C the fertilized subpopulation expressed an eight-fold higher I50 value (I50cN= 52.15μM, I50sN=6.33 μM). These results suggest that observed differences in final germination were not due to differences in GA3 sensitivity among accessions. The dose-response curves would indicate a tendency for sN to be more sensitive to PAC at sub-optimal temperature. More studies would be necessary to clarify the maternal fertilization effect on germination, its hormonal regulation and its consequences on weed emergence cohorts in the field.