tailieunhanh - Báo cáo lâm nghiệp: "Effect of gibberellic acid and ethephon on the germination of European beech dormant and chilled beechnuts"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Effect of gibberellic acid and ethephon on the germination of European beech dormant and chilled beechnuts. | JOURNAL OF FOREST SCIENCE 56 2010 9 389-396 Effect of gibberellic acid and ethephon on the germination of European beech dormant and chilled beechnuts P. Kolár OVA L. Bezdeckova Z. Prochazkova Forestry and Game Management Research Institute Strnady Kunovice Research Station Kunovice Czech Republic ABSTRACT The effect of ethephon 80 100 and 120 mg-l-1 and gibberellic acid GA3 40 300 and 1 000 mg-l-1 on the germination capacity GC and mean germination time MGT of European beech Fagus sylvatica L. dormant beechnuts or beechnuts pre-chilled for four weeks was determined. Compared to the control dormant untreated seeds or beechnuts treated with tap water no significant increase in mean GC was detected after the application of ethephon or GA3 to dormant seeds. Conversely both ethephon and GA3 treatments reduced ethephon significantly GC when applied to beechnuts chilled for four weeks prior to treatment. The effect of the treatments on germination speed MGT and dormancy release significantly improved when beechnuts were chilled for four weeks prior to the application of ethephon or GA3. However the effect of GA3 on MGT of chilled beechnuts was not so distinct compared to dormant untreated seeds. Reduction in MGT was most obvious in seeds hydrated with 1 000 mg-l-1 GA3 prior to germination. Their cold requirement time was reduced by three weeks compared to beechnuts hydrated in tap water. Keywords ethephon Fagus sylvatica germination gibberellic acid European beech Fagus sylvatica L. is one of the most widely-grown deciduous forest trees in Czech forests. It takes up 182 thousand ha of the total Czech forest land and this area is slowly increasing. Although natural beech regeneration is successful artificial reforestation is still needed. In 2008 beech was planted on 3 865 ha which represents 19 of the reforested area in that year Report on the state of forests and forestry in the Czech Republic in 2008 . As such it is necessary to ensure that sufficient beechnuts are