INTRAESPECIFIC VARIABILITY AND MATERNAL ENVIRONMENT EFFECTS ON SUNFLOWER (Helianthus annuus) DORMANCY TRAITS

BATLLA, DIEGO; LÓPEZ, ESTEBAN; ARATA GONZALO JOAQUÍN; RIVEIRA RUBIN MAILÉN; RODRÍGUEZ, M. VERÓNICA

Monterrey, CA

Congreso; ISSS Conference 10-14 September 2017; 2017

ISSS (International Society for Seed Science)

Dormancy (D!) in sunflower fruits is an usual problem to the seed industry, information on intraspecific variability and maternal environmental effects is scarce. The aim of the present work was to define dormancy phenotypes in a collection of sunflower genotypes, and their interaction with the maternal environment. Twenty two sunflower genotypes were sown in different dates during two consecutive years. Dormancy phenotypes were defined according to dormancy expression along the thermal range and rate of dormancy release at optimal temperature. Delayed sowing dates promoted lower achene and embryo dormancy at harvest and a faster dormancy release compared to early sowing dates. Achene germination correlated with seed/embryo sensitivity to ABA when combining data from different genotypes, maternal environments and afterripening times.