中国杂草稻种群的发芽期耐冷性研究  

Cold Tolerance of Seed Germination for Weedy Rice Populations in China

作　　者：杨金玲[1] 强胜[1] 张帮华[1] 宋小玲[1] 石志华[1] 蒋倩[1] 戴伟民[1] YANG Jin-ling QIANG Sheng ZHANG Bang-hua SONG Xiao-ling SHI Zhi-hua JIANG Qian DAI Wei-min(Weed Research Laboratory, Nanjing Agricultural University, Nanjing 210095)

机构地区：[1]南京农业大学杂草研究室,南京210095

出　　处：《植物遗传资源学报》2017年第1期1-9,共9页Journal of Plant Genetic Resources

基　　金：2013公益性行业(农业)科研专项(201303022);转基因生物新品种培育科技重大专项(2016ZX08011-001;2009ZX08012-020B);国家自然科学基金(30800604);国家重点研发计划(2016YFC1201202)

摘　　要：以中国75个杂草稻种群及其对应采样田的水稻品种为试验材料,研究了不同处理(破除休眠与不破除休眠、常温25℃与低温15℃、7 d测定和14 d测定)对种子发芽率的影响。结果表明,杂草稻的发芽率与对应采样点水稻品种的发芽率呈现极显著相关性。杂草稻破除休眠处理的发芽率显著或极显著高于不破除休眠处理。破除休眠与不破除休眠下,15℃处理的杂草稻种子发芽率均显著高于对应采样田的水稻品种,证明杂草稻相对于采样田水稻品种具有更强的耐冷性,可能进化出了新的耐冷性机制。25℃处理下杂草稻和对应水稻品种的发芽率均与纬度呈显著或极显著负相关,表明休眠性有随着纬度的降低而减弱的趋势。75 weedy rice populations and their coexisting cultivars of rice were collected. Seed germination was processed under 8 different treatments including with or without breaking dormancy, normal temperature （25 ℃ ） or low temperature（ 15℃ ） ,7 days or 14 days,respectively. The results showed at germination ratio of weedy rice had extremely significant correlation with that of their coexisting cuhivars without or with breaking dormancy. Germina- tion ratio of weedy rice with breaking dormancy was significantly or extremely significantly higher than that of weedy rice without breaking dormancy. Without or with breaking dormancy, cold tolerance of weedy rice was stronger than that of coexisting cuhivars ,which indicated weedy rice might had evolved a novel mechanism of cold tolerance at 15 ℃. Furthermore, germination ratio of weedy rice and their coexisting cuhivars at 25 ℃ had negative correlation with latitude, which showed weaker dormancy with decreasing latitude.

关 键 词：杂草稻 水稻 种子萌发率 耐冷性 

分 类 号：S451[农业科学—植物保护]