珙桐种子如何发芽出苗?
珙桐种子如何发芽出苗,珙桐是我国乃至世界上最著名的木本花卉之一,其种子播种育苗一般需2年时间才能发芽出苗,怎样处理种子才能缩短其发芽过程?珙桐种子具有致密厚实的木质外皮,阻挡着种胚对外界水分的吸收,因而很不容易发芽。
为了促成珙桐种子提前发芽,可通过低温加变温处理的方法,来促进外壳软化、松动、开裂和及早发芽。
其一是雪藏变温处理,将洗净的种子用湿沙混合后,埋藏于雪地里,使其寒冷时冰冻,升温时融化,温度高低变化剧烈,约经2~3个月的时间,利用低温和冰冻促成坚硬的种壳松动、开裂,到了4月份再行播种,可大大加快其发芽速度。
其二是冰箱变温处理,将处理后洗净的种子,用冷水浸泡2~3天,再将其放人冰箱中冰冻一个星期或10天,在有太阳时将种子从冰箱中取出,放在阳光下摊晒,待其冰化后再将种子重新置入冰箱中,如此反复4~5次,同样可有效促进种壳松动、开裂,使种胚能提前发芽,以上就是关于珙桐种子如何发芽出苗的介绍。
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