How meristem plasticity in response to soil nutrients and light affects plant growth in four Festuca grass species.
How meristem plasticity in response to soil nutrients and light affects plant growth in four Festuca grass species.
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DOI：
10.1111/j.1469-8137.2009.03090.x
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发表时间：
2010-02
期刊：
影响因子：
--
通讯作者：
S. Sugiyama;Minako Gotoh
中科院分区：
文献类型：
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作者：
S. Sugiyama;Minako Gotoh
研究分生组织对环境条件的响应对于理解植物表型可塑性的机制和后果具有重要意义。本文研究了分生组织对光照和土壤养分的可塑性对快速和缓慢生长的羊茅属禾本科植物叶片生长和相对生长率的影响。茎尖分生组织的活性以叶片出现率为指标，叶片分生组织的活性以细胞产生的持续时间和速率为指标，并进一步分为单细胞周期时间和分裂细胞数。光照和土壤养分对茎尖分生组织活性的影响相似。高的营养供给增加了分裂细胞的数量，这是细胞产量提高的原因；阴影条件延长了细胞生产的持续时间。结果表明，在高营养和遮荫条件下，叶片长度增加。在低营养条件下，RGR与茎部总分生组织大小呈正相关，表明在营养限制条件下，细胞生产抑制了RGR。速生树种在细胞生成率和比叶面积（SLA）上的可塑性较强，而在RGR上的可塑性较弱。本研究表明，分生组织的可塑性在表征植物物种的环境响应中起着关键作用。
Investigation of responses of meristems to environmental conditions is important for understanding the mechanisms and consequences of plant phenotypic plasticity. Here, we examined how meristem plasticity to light and soil nutrients affected leaf growth and relative growth rate (RGR) in fast- and slow-growing Festuca grass species. Activity in shoot apical meristems was measured by leaf appearance rate, and that in leaf meristems by the duration and rate of cell production, which was further divided into single cell cycle time and the number of dividing cells. Light and soil nutrients affected activity in shoot apical meristems similarly. The high nutrient supply increased the number of dividing cells, which was responsible for enhancement of cell production rate; shaded conditions extended the duration of cell production. As a result, leaf length increased under high nutrient and shaded conditions. The RGR was correlated positively with the total meristem size of the shoot under a low nutrient supply, implying inhibition of RGR by cell production under nutrient-limited conditions. Fast-growing species were more plastic for cell production rate and specific leaf area (SLA) but less plastic for RGR than slow-growing species. This study demonstrates that meristem plasticity plays key roles in characterizing environmental responses of plant species.