Seeds of Albizia chinensis（Osb.） Merr. in addition to water were also treated with different treatments by incubating in ethyl alcohol, acetone, and petroleum ether at room temperature for different durations. Seed ...Seeds of Albizia chinensis（Osb.） Merr. in addition to water were also treated with different treatments by incubating in ethyl alcohol, acetone, and petroleum ether at room temperature for different durations. Seed heat treatment was done at temperatures of 30, 40 and 60℃ for different durations up to 24 h. To overcome dormancy caused by the impermeable seed coat, seeds were nicked and also treated with concen- trated sulphuric acid for different durations. Seeds responded to treat- ments with sulphuric acid and nicking only. Treatment with sulphuric acid for 20 and 30 min showed maximum germination at all incubation temperatures as compared to untreated controls and seeds treated with sulphuric acid for 10 min and nicking. Seedling length was greatest from seeds treated with sulphuric acid for 20 and 30 min and incubated at 30 ℃. Seedling dry weight was highest from nicked seeds incubated at 20℃ The most favourable incubation temperature was 30 ℃ as evidenced from GR （germination rate index） and Gv （germination value）. After ascertaining the seed response and performance we recommend that seeds ofAlbizia chinensis be treated with sulphuric acid for 20 or 30 min and incubation temperature of 25 to 30℃.展开更多
Abstract： We investigated the effect of provenance variation on cone and seed morphology and germination behaviunr under different pretreatments in Picea smithiana. Three categories of cones were recognized： large ...Abstract： We investigated the effect of provenance variation on cone and seed morphology and germination behaviunr under different pretreatments in Picea smithiana. Three categories of cones were recognized： large （13.18 cm×3.30 cm-15.42 cm × 4.35 cm）, medium （10.85 cm × 3.93 cm-12.18 cm× 3.98 cm） and small （7.69 cm× 3.06-10.98 cm× 3.39 cm）. Significant variation was observed for various cone and seed characteristics. Seeds moisture content varied from 44.48% to 56.91%, seed size from 0.64 cmx 0.31 cm （largest seed） to 0.49 cm× 0.10 cm （smallest seed）, and the seed weight from 2.45 g per 100 seeds to 1.36 g per 100 seeds on fresh weight basis of P. smithiana. The highest seed germination （72.0±7.53%） at 10℃ was observed under chilling treatment in Tapovan provenance, while the minimum （15.0±5.71%） seed germination was recorded at 25℃ under control set in Tapovan provenance. Further among all the sources Pandukeshwar consistently had the highest average （38%） percent germination across all treatments. Compared to other temperature regimes and pretreatments, seeds subjected to 10℃ and chilling treatment had the highest germination and took the least time for germination irrespective of provenance effects. Altitude （provenance） had little or no relationship with germination following laboratory treatments. Seeds from Tapovan provenance subjected at 10℃ following chilling treatment may be suggested for further multiplication of this species.展开更多
文摘Seeds of Albizia chinensis（Osb.） Merr. in addition to water were also treated with different treatments by incubating in ethyl alcohol, acetone, and petroleum ether at room temperature for different durations. Seed heat treatment was done at temperatures of 30, 40 and 60℃ for different durations up to 24 h. To overcome dormancy caused by the impermeable seed coat, seeds were nicked and also treated with concen- trated sulphuric acid for different durations. Seeds responded to treat- ments with sulphuric acid and nicking only. Treatment with sulphuric acid for 20 and 30 min showed maximum germination at all incubation temperatures as compared to untreated controls and seeds treated with sulphuric acid for 10 min and nicking. Seedling length was greatest from seeds treated with sulphuric acid for 20 and 30 min and incubated at 30 ℃. Seedling dry weight was highest from nicked seeds incubated at 20℃ The most favourable incubation temperature was 30 ℃ as evidenced from GR （germination rate index） and Gv （germination value）. After ascertaining the seed response and performance we recommend that seeds ofAlbizia chinensis be treated with sulphuric acid for 20 or 30 min and incubation temperature of 25 to 30℃.
文摘Abstract： We investigated the effect of provenance variation on cone and seed morphology and germination behaviunr under different pretreatments in Picea smithiana. Three categories of cones were recognized： large （13.18 cm×3.30 cm-15.42 cm × 4.35 cm）, medium （10.85 cm × 3.93 cm-12.18 cm× 3.98 cm） and small （7.69 cm× 3.06-10.98 cm× 3.39 cm）. Significant variation was observed for various cone and seed characteristics. Seeds moisture content varied from 44.48% to 56.91%, seed size from 0.64 cmx 0.31 cm （largest seed） to 0.49 cm× 0.10 cm （smallest seed）, and the seed weight from 2.45 g per 100 seeds to 1.36 g per 100 seeds on fresh weight basis of P. smithiana. The highest seed germination （72.0±7.53%） at 10℃ was observed under chilling treatment in Tapovan provenance, while the minimum （15.0±5.71%） seed germination was recorded at 25℃ under control set in Tapovan provenance. Further among all the sources Pandukeshwar consistently had the highest average （38%） percent germination across all treatments. Compared to other temperature regimes and pretreatments, seeds subjected to 10℃ and chilling treatment had the highest germination and took the least time for germination irrespective of provenance effects. Altitude （provenance） had little or no relationship with germination following laboratory treatments. Seeds from Tapovan provenance subjected at 10℃ following chilling treatment may be suggested for further multiplication of this species.
