MATERNAL EFFECTS ON Lithospermum arvense L. SEED DORMANCY I. SOIL WATER REGIME

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

Buenos Aires

Congreso; XXII Congreso Latinoamericano de Malezas ALAM y I Congreso Argentino de Malezas ASACIMI; 2015

ASACIM-ALAM

Different ecological strategies are developed by weed species to improve their fitness under unpredictable environmental conditions. Seed dormancy is an important ecological trait which is known to be influenced by environmental factors during seed development on the mother plants. Lithospermum arvense L. is a weedy annual species of winter cereal crops of the semiarid temperate region of Argentina. The objective of this work was to evaluate the effect of the soil water regime as a maternal factor on the level of primary dormancy of the progeny. Mother plants were grown under two contrasting irrigation regimes (water-stress vs. non-restrictive soil water supply) and their progeny was evaluated over a range of temperatures at different after-ripening times. A thermal-time approach based on after-ripening thermal-time accumulation was used to evaluate seed germinability. L. arvense seeds obtained from stressed plants showed higher mean maximum germination temperature (Tc(50)) values during the after-ripening period and also lower suboptimal thermal-time (sub) requirements after 271 days of after-ripening compared to the progeny of non water restricted plants.