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在德华坎新石器时代土壤中,玉米化期间根类现象的演变的形分析

Ivan Lopez-Valdivia¹, Miguel Vallebueno-Estrada², Harini Rangarajan¹

¹Department of Plant Science, The Pennsylvania State University, University Park, PA, 16802, USA.

The New phytologist

|May 30, 2025

概括

玉米根的演变表明节点根数 (NRN) 减少,多序列皮质结核病 (MCS) 与CO2的增加一起出现. 种植根数 (SRN) 的增加与农业强化和土壤退化相吻合,有助于适应.

科学领域:

植物生物学植物生物学
进化生物学是进化的生物学.
农业科学农业科学

背景情况:

根系结构对于植物适应环境变化至关重要.
根特征在作物化,特别是玉米中的特定作用尚未完全理解.
了解玉米化中的根进化可以为未来的作物改进提供信息.

研究的目的:

为了研究从theosinte到玉米的过渡期间根表型的进化轨迹.
为了将根特征的变化与德华坎山谷的古气候和农业变化相关联.
阐明玉米进化中的根基修饰的适应意义.

主要方法:

使用古代DNA和古植物学重建古代根类现象.
功能结构建模模拟根系性能在过去的环境条件下.
在古老的玉米样本中分析等位素频率,以推断特征进化的时间.

主要成果:

大气中二氧化碳度的增加 (12,0008,000 yrBP) 有利于减少结节根数 (NRN) 和多序列皮质硬质瘤 (MCS),促进更深的根系.
灌的引入 (6000年前) 通过改变的分布,提高了减少NRN和MCS的适应价值.
增加的种子根数 (SRN) 可能在3,500年前左右出现,与农业强化和土壤退化相关.

结论:

根类表型的演变是为了应对不断变化的环境压力,包括大气中的二氧化碳和的可用性.
特定的根性特征,如减少的NRN和MCS,在Holocene环境转变下提供了适应优势.
增加SRN的演变与农业实践和土壤状况有关,突出显示了玉米在人类改变的景观中的根特征对玉米适应的重要性.

关键词:

这里是Tehuacán.古老的玉米古代的玉米多个序列的皮质皮质硬膜.节点根数的节点根数根的化根的化根的演化是根的演化.种子根数种子根数这就是神圣的Teosinte.

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