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根尖分生组织细胞核大小:一个可能用于植物入侵性评估的新指标

DOI: 10.11913/PSJ.2095-0837.2015.10053, PP. 53-60

Keywords: 分生组织,细胞学指标,入侵性,种子产量,世代时间

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Abstract:

?植物的入侵性与DNAC-值之间存在统计学上的负相关关系。在这种关系中,细胞和细胞核大小可能起关键作用,因此我们推测分生组织细胞核大小在评估植物或至少某些分类群的入侵性方面有潜在的应用价值。本研究以豌豆属(Vicia)5种入侵能力不同的植物为材料,观察了它们的分生组织染色体、细胞核和细胞大小以及有丝分裂速率,同时测定了种子产量、单位种子干重产生的幼苗生物量(近似于幼苗相对生长速率)和生活史的长短。结果显示根尖分生区细胞核较小的植物细胞较小,细胞分裂速率快,单位种子干重产生的幼苗生物量高,种子小而数量多,生活史短。这些结果表明5种豌豆属植物中分生组织细胞核较小的倾向于具有较高的入侵性,其原因主要是:(1)能够产生小而多的种子;(2)具有较高的有丝分裂速率、相对较快的幼苗生长速率和短的生活史。分生组织细胞核大小影响植物入侵性与DNAC-值的作用是一致的,在植物入侵性评估模型中,分生组织细胞核大小在评估植物入侵性方面可能具有潜在的应用价值,而且其测定方便、费用低廉。但是,这一指标的应用范围和条件需要进一步筛选。

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