文献类型：期刊文献

英文题名：IRRADIATION DOSE AND EFFECT ON GERMINATION AND GROWTH OF DESERT SHRUB NITRARIA TANGUTORUM BOBR. WITH TWO GAMMA IRRADIATION MODES

作者：Li, Qing-He[1] Wang, Sai-Xiao[1] Zhao, Ying-Ming[2] Xu, Jun[2] Gao, Ting-Ting[1] Ren, Wen-Jiao[1]

第一作者：李清河

通信作者：Li, QH[1]

机构：[1]Chinese Acad Forestry, Res Inst Forestry, State Key Lab Tree Genet & Breeding, Beijing 100091, Peoples R China;[2]Chinese Acad Forestry, Expt Ctr Desert Forestry, Dengkou 015200, Inner Mongolia, Peoples R China

年份：2012

卷号：44

期号：2

起止页码：661-666

外文期刊名：PAKISTAN JOURNAL OF BOTANY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000303278500028)】；

基金：This work was supported by the grants from the Key Project (ZD200915) financed by Research Institute of Forestry, Chinese Academy of Forestry, the National Promotion Program of Forestry Sci. & Tech. ([2011]28) and National Key Technologies R&D Program in the 11th Five-Year Plan of China (2006BAD26B0801), which is gratefully acknowledged.

语种：英文

摘要：The seeds of Nitraria tangutorum were exposed to different doses of gamma radiation from Co-60 gamma rays based on the two irradiation modes of without dose rate and with dose rate of 25Gy/hr. The effects of different irradiation modes and irradiation dose on the seed germination rate, emerged seedling rate and phenotypic characters of seedling have been studied. The semi-lethal dose and critical dose were determined for different irradiation mode. It has been found that there were the differences of irradiation effects between the two irradiation modes. Promotion effect on the seed germination rate, emerged seedling rate, seedling height and ground diameter in lower dose treatment were observed, while inhibition in higher dose. As compared to control, the irradiation effects on the seed germination rate and seedling height and ground diameter present the very remarkable differences at above 1500Gy dose without dose rate mode, while above 2400Gy with dose rate mode. The negative relativity exists between the relative emerged seedling rate and irradiation dose, the emerged seedling rate decreased with increasing dose. The semi-lethal dose based on the emerged seedling rate was 985Gy and 1363Gy for the irradiation without dose rate and with 25Gy/hr dose rate, respectively. The Appropriate Co-60 gamma irradiation dose for the Nitraria tangutorum seeds was ranging from 950 Gy to 1500Gy without dose rate irradiation mode, while 1300Gy to 2400Gy with 25Gy/hr dose rate mode.