摘要
Peltophorum dubium seeds were set to imbibe with four treatments, soaked with solution Captan 0.2% under 10and 27℃,PEG 6000 -1.0 MPa under 10 and 27℃. For each treatment there were four replicates with 40 seeds incubated in 9-cm Petri dishes with double filter paper moistened with testing solution. The imbibition curves showed that the final weight increase were from 70% to 150% in the treatments when imbibition entered a lag phase. Seeds were tested for effects on germination of five treatments: control group (nonprimed), primed with PEG6000 -1.0 MPa at 10 and 27℃, primed with Captan 0.2% at 10 and 27℃. For each treatment, there were three sub-treatments: seeds were soaked in distilled water for 12, 24 and 36h before the energy test. Germination percentages of nonprimed seeds and primed in PEG 27℃ soaked in distilled water during 12 h were the highest, reaching 100%. The lowest germination percentage occurred primed seeds with PEG6000 27℃ and soaked in distilled water during 36 h, which was only 52%. Germination mean time of primed seeds in PEG at 10℃, soaked 24 h was 1.08 days, mean time of primed seeds in PEG at 27℃ soaked 12 h was 2.42 days. Accelerated ageing results showed low or no germination after ageing 72 h. Control group had a higher germination percentage and seeds were more resistant to deterioration than those in primed groups, both in Petri dish (27℃) and vermiculate (room temperature).
Peltophorum dubium seeds were set to imbibe with four treatments, soaked withsolution Captan 0.2% under 10 and 27 ℃, PEG 6000 -1.0 MPa under 10 and 27 ℃. For each treatmentthere were four replicates with 40 seeds incubated in 9-cm Petri dishes with double filter papermoistened with testing solution. The imbibition curves showed that the final weight increase werefrom 70% to 150% in the treatments when imbibition entered a lag phase. Seeds were tested foreffects on germination of five treatments: control group (non-primed), primed with PEG6000 -1.0 MPaat 10 and 27 ℃, primed with Captan 0.2% at 10 and 27 ℃. For each treatment, there were threesub-treatments: seeds were soaked in distilled water for 12, 24 and 36h before the energy test.Germination percentages of nonprimed seeds and primed in PEG 27 ℃ soaked in distilled water during12 h were the highest, reaching 100%. The lowest germination percentage occurred primed seeds withPEG6000 27 ℃ and soaked in distilled water during 36 h, which was only 52%. Germination mean timeof primed seeds in PEG at 10 ℃, soaked 24 h was 1.08 days, mean time of primed seeds in PEG at 27℃ soaked 12 h was 2.42 days. Accelerated ageing results showed low or no germination after ageing72 h. Control group had a higher germination percentage and seeds were more resistant todeterioration than those in primed groups, both in Petri dish (27 ℃) and vermiculate (roomtemperature).
基金
This work is supported by CAPES, Brazil. Open research laboratory of forest plant ecology, Northeast Forestry University and The State's tenth five-year "211 Project"-supported key academic discipline program of ECNU
