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植物研究 ›› 2022, Vol. 42 ›› Issue (4): 688-693.doi: 10.7525/j.issn.1673-5102.2022.04.018

• 生理与生态 • 上一篇    下一篇

苦槠传播体的萌发特性与种子休眠类型

乐新贵1, 王正伟2, 宁馨2, 孙锡青2,3, 宋以刚2()   

  1. 1.江西阳际峰国家级自然保护区管理局,贵溪 335400
    2.上海辰山植物园,华东野生濒危资源植物保育中心,上海 201602
    3.闵行区青少年实践教育基地,上海 201111
  • 收稿日期:2021-09-03 出版日期:2022-07-20 发布日期:2022-07-15
  • 通讯作者: 宋以刚 E-mail:ygsong@cemps.ac.cn
  • 作者简介:乐新贵(1973—),男,硕士研究生,林业高级工程师,主要从事森林保护与管理方面的研究。
  • 基金资助:
    国家自然科学基金项目(31901217);国家重要野生植物种质资源库上海辰山植物园分库建设项目(ZWGX2005)

The Germination Characteristics and Dormancy Type of the Seed of Castanopsis sclerophylla

Xingui LE1, Zhengwei WANG2, Xin NING2, Xiqing SUN2,3, Yigang SONG2()   

  1. 1.Jiangxi Yangjifeng National Nature Researve,Guixi 335400
    2.Eastern China Conservation Centre for Wild Endangered Plant Resources,Shanghai Chenshan Botanical Garden,Shanghai 201602
    3.Youth practice education Base of Minhang District,Shanghai 201111
  • Received:2021-09-03 Online:2022-07-20 Published:2022-07-15
  • Contact: Yigang SONG E-mail:ygsong@cemps.ac.cn
  • About author:LE Xingui(1973—),male,postgraduate,senior forestry engineer,mainly engaged in forest protection and management.
  • Supported by:
    National Natural Science Foundation of China(31901217);National Important Wild Plant Germplasm Resource Bank,Shanghai Chenshan Botanical Garden Branch(ZWGX2005)

摘要:

种子的萌发特性是植物在长期进化过程中形成的一种适应环境变化的固有属性。对种子萌发特性的研究有助于我们理解物种的种群更新和种子育苗。本文旨在阐明我国重要资源植物苦槠(Castanopsis sclerophylla)的种子休眠类型和萌发特性。研究结果发现:①苦槠种子在其果实中占比非常高;②苦槠的果皮限制了种子对水分的吸收;③苦槠果皮阻碍了种子的萌发,除去果皮以后种子能够在较大温度范围内萌发;④除去果皮以后,苦槠种子在低温(15/5 ℃、20/10 ℃)下萌发困难,在25/15 ℃、30/20 ℃和35/25 ℃这3个温度梯度下均能迅速萌发。结果表明,苦槠的传播体(果实)具有物理休眠的特性。因此,壳斗科(Fagaceae)是具有物理休眠和脱水敏感性的一个新纪录科。结合壳斗科的系统发育位置,本研究支持物理休眠是一种较为进化的性状这一假说。

关键词: 顽拗性种子, 物理休眠, 壳斗科, 种子休眠解除

Abstract:

The seed germination is an inherent property that plant adopt to environmental changes and the study of seed germination would help us to understand the population regeneration and seedling nursery. This study aimed to elucidate the type of seed dormancy and seed germination characteristics of Castanopsis sclerophylla, an important resource plant in China, the results showed that ①a very high proportion of the fruits was the seeds; ②the water absorption of the seeds was limited by the pericarp; ③seed germination was impeded by the pericarp, and seeds germinated in a wide temperature range after the pericarp removed;④the germination of seeds was difficult at15/5℃ or 20/10℃, but the germination was rapid at 25/15 ℃, 30/20 ℃ and 35/25 ℃ respectively. The results indicate that the diaspore(fruit) of C. sclerophylla had physical dormancy(PD), Fagaceae is a new recorded family with PD and dehydration sensitivity. The results also support the hypothesis that PD is a relatively evolved trait.

Key words: recalcitrant seeds, physical dormancy, fagaceae, seed dormancy release

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