元谋干热河谷车桑子种子休眠与萌芽的空间变异特征研究

Spatial Variation in Seed Dormancy and Germination of Dodonaea viscose in Yuanmou Dry-hot Valley, China

摘要:

为明确车桑子[Dodonaea viscosa（L.） Jacq.]种子的休眠特性和地理变异特性，测定了云南省元谋县凉山乡（属北亚热带区）和坝区苴林乡（属南亚热带区）车桑子种子形态，观察了种子的休眠特性和萌发特性。结果表明，两地的车桑子种子都具有物理休眠特性，经热水处理的种子萌发率显著高于未处理的种子（P=0.001）。两地种子在长、宽、长/宽以及种子百粒重上十分接近，其萌发特征和幼苗生长特征没有表现出显著差异。因此，坝区苴林乡和凉山乡种子并未发生地理变异，两地均适合车桑子采种，但在播种前应进行种子休眠破除，以提高种子发芽率。

Abstract:

In order to reveal dormancy character and geographical variation of Dodonaea viscose seeds, the seeds were collected from Liangshan and Zuolin Xiang in Yuanmou Xian, Yunnan Province, and their germination character was studied. The results showed that seeds from two places had physical dormancy, and the germination rate of seeds treated by hot water was significantly (P=0.001) higher than that of untreated seeds. The width, length of seed, ratio of length to width, and 100-seed weight between Liangshan and Zuolin were very close. Besides, the seed germination and seedling growth of D. viscose had no significant differences between Liangshan and Zuolin. Therefore, seeds from Liangshan and Zuolin had no geographical variation, the two places are feasible to seed collection. But seed dormancy should be broken before sowing to improve germination rate.