《植物生理学报》 2009, 45(11): 1089-1092

极度濒危植物大果木莲种子的休眠与萌发

潘睿^1,2, 孙卫邦^1,*

1 中国科学院昆明植物研究所昆明植物园, 昆明650204; 2 中国科学院研究生院, 北京100039

通信作者：孙卫邦；E-mail: wbsun@mail.kib.ac.cn；Tel: 0871-5223622

摘　要：

大果木莲种子具吸水性, 胚未完全发育。新鲜种子25 ℃下的萌发率仅2%, 在30/20 ℃和20/10 ℃的条件下30 d内分别有27%和36%种子萌发。在20/10 ℃下, 1 000 mg·L-1浓度的GA3 可以有效打破种子休眠。冷层积120 d的种胚生长不显著, 大果木莲种子具有条件休眠特性, 属于浅度简单型形态生理休眠。种子经冷层积60 d的萌发率最高, 而后下降, 提示其可能有休眠循环现象。

关键词：大果木莲; 种子; 条件休眠; 形态生理休眠; 休眠循环

收稿：2009-09-17   修定：2009-09-30

资助：国际植物园保护联盟中国木兰科项目(6206/R4331)和云南省中青年学术与技术带头人项目(2006PYo1-48)。

Seed Dormancy and Germination of the Critically Endangered Manglietia grandis Hu et Cheng

PAN Rui^1,2, SUN Wei-Bang^1,*

¹Kunming Botanical Garden, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204, China; ²Graduate University of Chinese Academy of Sciences, Beijing 100039, China

Corresponding author: SUN Wei-Bang; E-mail: wbsun@mail.kib.ac.cn; Tel: 0871-5223622

Abstract:

The seeds of Manglietia grandis Hu et Cheng had good water-absorption and the embryos were underdeveloped. Only 2% fresh seeds germinated at 25 ℃, while the germination rate could reach 27% and 36% under the condition at 30/20 ℃ and 20/10 ℃ during 30 days, respectively. Seeds dormancy could be broken by 1 000 mg·L^-1GA₃ effectively at 20/10 ℃. Embryos did not grow markedly during 120 days cold stratification, indicating the seeds were conditionally dormant, which belonged to morphophysiological simple dormancy. When the seeds had been in cold stratification for 60 days the germination rate was maximum and then decreased, indicating that the seeds could have dormancy cycles.

Key words: Manglietia grandis Hu et Cheng; seeds; conditional dormancy; morphophysiological dormancy; dormancy cycle