摘要
采自地中海地区的非幅射状花型欧洲千里光(Senecio vulgaris L.)种子有很强的原发性休眠。英国产的欧洲千里光则可在20℃条件下达到80％的发芽率。地中海居群的欧洲千里光种子的休眠可以被下列处理打破:15℃的长期贮藏;短时间的低温层积;流水冲洗;赤霉酸处理和破除果皮与种皮。新采收种子的石油醚提取液具有强烈的抑制作用,这意味着胚或种皮含有抑制剂是休眠的原因。种子原发性休眠是对地中海气候类型的一种适应,即植物在冬季也生长。
Fresh seed derived from a Mediterranean population of non-radiate Senecio vulgaris L. showed strong innate dormancy over a wide temperature range. In contrast, fresh seed of British S. vulgaris exhibited > 80 per cent germination at 20℃.Dormancy in Mediterranean seed was overcome by: prolonged storage at 15℃ and above; a short stratification treatment (two weeks at 4℃); prolonged leaching with water; treatment with gjbberellic acid (GA3) alone (and with kinetin); and to a lesser extent, by wounding (i.e.removal of a small portion of the fruit and seed coat). A petroleum ether extract from fresh Mediterranean seed strongly inhibited the germination of previously non-dormant seed (of British origin). This implies that dormancy may be caused by an inhibitor present in the embryo or seed coat which might act by preventing the synthesis or liberation of gibberellins required for germination. The innate dormancy exhibited by seed of non-radiate Mediterranean S. vulgaris, enables the species to adopt a winter annual life cycle which is typical of Mediterranean ephemerals.
出处
《云南植物研究》
CSCD
1992年第1期80-86,共7页
Acta Botanica Yunnanica
关键词
欧洲千里光
种子休眠
发芽
千里光
Senecio vulgaris
Seed dormancy
Germination
Ecotypic variation
