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种子类型和根源依赖的苗木出现模式在种子类型和根源依赖的苗木出现模式

S Holden Jones1, Paul B Reed2, Bitty A Roy3

  • 1School of Life Sciences University of Hawai'i at Mānoa Honolulu Hawaii 96822 USA.

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概括

在修复实验中,Danthonia californica的单双种子在修复实验中表现优于单双种子,没有显示本地适应,但表现更好. 这些发现表明,单双种子对草原生态系统的恢复有价值.

关键词:
气候变暖 气候变暖共同的花园 共同的花园地方适应 地方适应非地方的非地方.

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科学领域:

  • 生态生态学 生态生态学
  • 恢复生态学 恢复生态学
  • 植物生物学 植物生物学

背景情况:

  • 加利福尼亚麦 (Danthonia californica) 对于美国西部草原的恢复至关重要.
  • 这种物种生产的种子既是半交叉的 (超越) 和单交叉的 (自我受精).
  • 恢复通常使用杂交种子,由于遗传多样性,期望在新环境中表现更好.

研究的目的:

  • 评估种子类型 (杂交 vs. 杂交) 和源种群对Danthonia californica. 种子出现的影响.
  • 为了确定种子类型中是否存在局部适应.
  • 为了告知有关种子选择的恢复实践.

主要方法:

  • 在俄勒冈州威拉梅特山谷的两个地点进行了一项共同花园实验.
  • 对八个Danthonia californica种群的种子出现进行了评估,这些种群来源于沿一个度梯度.
  • 种子类型,种子来源及其相互作用被分析为它们对生长的影响.

主要成果:

  • 对于 chasmogamous 或 cleistogamous 种子,没有发现本地适应的证据.
  • 单双种子在出现时始终超过单双种子,无论种子来源 (本地或非本地).
  • 幼苗的出现与平均种子重量有积极的相关性,尽管混杂种子的重量更大.

结论:

  • 克莱斯托加姆种子在普通花园实验中表现优越,用于Danthonia californica的恢复.
  • 这些发现挑战了假设只有交叉种子适合新环境的假设.
  • 修复从业者应该考虑在Danthonia californica修复项目中增加 cleistogamous 种子的使用.