IFEVA   02662
INSTITUTO DE INVESTIGACIONES FISIOLOGICAS Y ECOLOGICAS VINCULADAS A LA AGRICULTURA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
EFFECT OF SEED WATER CONTENT DURING STRATIFICATION ON DORMANCY RELEASE IN Polygonum aviculare L. SEEDS.
Autor/es:
CRISTIAN MALAVERT; DIEGO BATLLA; ROBERTO LUIS BENECH-ARNOLD
Lugar:
Changsha, Hunan
Reunión:
Congreso; The 11th Conference of the International Society for Seed Science (ISSS); 2014
Institución organizadora:
International Society for Seed Science (ISSS)
Resumen:
p { margin-bottom: 0.21cm; direction: ltr; color: rgb(0, 0, 0); }p.western { font-family: "Times New Roman",serif; font-size: 12pt; }p.cjk { font-family: "Droid Sans Fallback"; font-size: 12pt; }p.ctl { font-family: "Lohit Hindi"; font-size: 12pt; }a.western:link { }a.ctl:link { } Dormancy in seeds of many weed species determines the existence of seed banks that tends to perpetuate in the soil. The number of established seedlings and time of weed emergence is strongly related to the dynamics of dormancy release of the seed population. Changes in the level of dormancy in the seed bank are mainly regulated by temperature, but it is not known exactly how this effect is modulated by the seed hydration level determined by soil water content. The aim of this work was to study the effect of water content during stratification on dormancy release rate in P. aviculare seeds. To measure the effect of water content, seeds of Polygonum aviculare were stored at 5°C for a period of 100 days (thermal stratification conditions for dormancy release) under controlled conditions of relative humidity (RH%) of 5, 11, 61, 75, 88, 96 and 100 RH%; under these conditions moisture content values in the seeds of 6.7, 7.6, 11.4, 13.4, 15.8, 22 and 29.8% were obtained. Obtained results showed the existence of a lower water content threshold of 16 % in the seed below which no dormancy release takes place. Seed water content values above this threshold promoted the effect of stratification temperature on dormancy release, showing an increase in the dormancy loss rate with increasing seed water contents. The results obtained in this study are among the first to quantify the effect of seed moisture content during the period of stratification on the dormancy release rate. This obtained results could be incorporated into existing predictive models to take into account the effect of soil water content on the dormancy loss process.