拉雅松 新种 图1 Pinus crassicorticea Y. G. Zhong et K. X. Huang, sp. nov. (subgen. Pinus; Sect. Pinus). Species affinis P. massonianae, sed cortice multo crassiore, foliis rigiioribus; canalibus resiniferis 8—13, mar...拉雅松 新种 图1 Pinus crassicorticea Y. G. Zhong et K. X. Huang, sp. nov. (subgen. Pinus; Sect. Pinus). Species affinis P. massonianae, sed cortice multo crassiore, foliis rigiioribus; canalibus resiniferis 8—13, marginalibus et prope fascicule vasorum positis; ramulis glaueis; squamis strobili hornotini apice 3-spinulosis differt. Arbor 18—35 na alta, trunco ad 60—90 cm; cortex persistens,展开更多
After subjecting the seeds to GA3 and H2O2 treatments for 24 h and chilling at 2-3℃ for a period of 15 days, we conducted the seed germination tests for 21 different seed sources ofPinns roxburghii from western-centr...After subjecting the seeds to GA3 and H2O2 treatments for 24 h and chilling at 2-3℃ for a period of 15 days, we conducted the seed germination tests for 21 different seed sources ofPinns roxburghii from western-central Himalaya under laboratory conditions at various temperatures viz., 20℃, 25℃ and 30℃ inside a seed germinator. The results reveal that the soaking of seeds in H2O2 （1% v/v） and GA3 （ 10 mg.L^-1） solutions manifested 82.39% and 78.19% germination, respectively whereas untreated seeds exhibited 70.79% average germination. Both GA3 and H2O2 treatments caused an appreciable shortening of the germination period by 8 days and 10 days, respectively. Moist-chilling did improve the rate and percentage of germination when germinated at 20℃ over 21 days; however total germination was not affected at temperatures 25℃ and 30℃, Although the seeds of P. roxburghii germinate well due to lack of dor- mancy, the increasing demand for large quantities of seeds of P. roxburghii for reforestation programmes make pre-sowing treatments useful in improving the rate and percentage of gemaination.展开更多
文摘拉雅松 新种 图1 Pinus crassicorticea Y. G. Zhong et K. X. Huang, sp. nov. (subgen. Pinus; Sect. Pinus). Species affinis P. massonianae, sed cortice multo crassiore, foliis rigiioribus; canalibus resiniferis 8—13, marginalibus et prope fascicule vasorum positis; ramulis glaueis; squamis strobili hornotini apice 3-spinulosis differt. Arbor 18—35 na alta, trunco ad 60—90 cm; cortex persistens,
基金suportted by the Indian Council of Forestry Research and Education (ICFRE) Dehradun
文摘After subjecting the seeds to GA3 and H2O2 treatments for 24 h and chilling at 2-3℃ for a period of 15 days, we conducted the seed germination tests for 21 different seed sources ofPinns roxburghii from western-central Himalaya under laboratory conditions at various temperatures viz., 20℃, 25℃ and 30℃ inside a seed germinator. The results reveal that the soaking of seeds in H2O2 （1% v/v） and GA3 （ 10 mg.L^-1） solutions manifested 82.39% and 78.19% germination, respectively whereas untreated seeds exhibited 70.79% average germination. Both GA3 and H2O2 treatments caused an appreciable shortening of the germination period by 8 days and 10 days, respectively. Moist-chilling did improve the rate and percentage of germination when germinated at 20℃ over 21 days; however total germination was not affected at temperatures 25℃ and 30℃, Although the seeds of P. roxburghii germinate well due to lack of dor- mancy, the increasing demand for large quantities of seeds of P. roxburghii for reforestation programmes make pre-sowing treatments useful in improving the rate and percentage of gemaination.
