摘要
研究了冬季相对低温（15、4和0℃）湿藏和室温干燥贮藏对亚热带5种马鞭草科植物马缨丹（Lantana camara）、假连翘（Duranta repens）、假马鞭（Stachytarpheta jamaicensis）、牡荆（Vitexnegundo var．cannabifolia）和单叶蔓荆（Vitex trifolia var．simplicifolia）种子萌发的影响。结果表明，5种马鞭草科植物种子扩散时萌发率较低（〈50％）或不萌发，低温层积可以破除部分种子休眠，提高萌发率或加快萌发速度。马缨丹种子扩散时萌发率是10．7％，经过15℃湿藏后萌发率达到45．3％；假马鞭种子扩散时萌发率为10％和49．3％（25℃和25／15℃），经过低温层积和室温干燥贮藏后萌发率分别达到22．7％～34％和55％以上（除0℃贮藏以外）；牡荆种子扩散时萌发率h10％，经过低温层积和室温干燥贮藏后萌发率达到20％～30％；单叶蔓荆种子扩散时不萌发，经过15和4℃湿润贮藏后萌发率达到45．3％和42％；假连翘种子经不同贮藏后萌发率不足6％。亚热带冬季相对低温是5种植物种子萌发的环境暗示，使其在最适宜幼苗存活和生长的春季萌发，增大物种适合度。
This paper studied the effects of wet storage at relatively low temperatures （ 15, 4 and 0 ℃ ） during winter and dry storage at room temperature （ 20-25 ℃ ） for 30 days on seed germi- nation of five Verbenaceae species including Lantana camara , Duranta repens , Stachytarpheta ja- maicensis, Vitex negundo var. cannabifolia, and Vitex trifolia var. simplicifolia from eastern Guangdong, aiming to better understand the seed germination characteristics of these species and how these species adapted to their habitats. The results showed that seed germination percentages of five Verbenaceae species on the conditions of seed dispersal （ incubation at 25 ℃ or 25/15 ℃ for 30 days） were low （〈50%） or with no germination. Cold stratification at 15 ℃ and 4 ℃ sig- nificantly increased their germination percentage and rates. Seeds of L. camara with initial germi- nation of 10.7% had a germination percentage of 45.3% after wet storage at 15 ℃. Seeds of S. ja- maicensis with initial germination of 10% and 49.3% （at 25 ℃, 25/15 ℃, respectively） germi- nated up to 22.7%-34% and 〉55%, following cold stratification （ exception for storage at 0 ℃ ） and dry storage at room temperature, respectively. As for seeds of V. negundo var. cannabifolia with initial germination of 10%, cold stratification and dry storage increased the germination per- centage to 20%-30%. Seeds of V. trifolia var. simplicifolia with no initial germination germinated to 45.3% and 42% following storage at 15 ℃ and 4 ℃, resoectivelv. Germination oercentage of D. repens seeds following various storage treatments was less than 6%. The cold stratification may be an environment cue or trigger of germination for these Verbenaceae species to ensure that ger- mination in spring is most favorable for the survival of seedlings, thus ensuring seedling survival and population establishment.
出处
《生态学杂志》
CAS
CSCD
北大核心
2015年第12期3313-3318,共6页
Chinese Journal of Ecology
基金
国家自然科学基金项目(31470021)
广东韩山师范学院2012年科研团队项目(LT201204)
广东韩山师范学院科研启动项目(QD20131105)资助
关键词
马鞭草科
低温层积
萌发与休眠
更新策略
Verbenaceae
cold stratification
germination and dormancy
regenerative strategy.
