J Integr Plant Biol. ›› 2003, Vol. 45 ›› Issue (10): 1210-1217.

• Research Articles • Previous Articles     Next Articles

Phenotypic Plasticity in Response to the Heterogeneous Water Supply in the Rhizomatous Grass Species, Calamagrostis epigejos in the Mu Us Sandy Land of China

ZHANG Cheng-Yi, YU Fei-Hai , CHEN Yu-Fu , DONG Ming *   

Abstract:

Calamagrostis epigejos (L.) Roth. is a perennial grass with slender and long rhizome segments between interconnected neighbor ramets. To investigate the phenotypic plasticity in response to the heterogeneous soil water supply, ramet pairs of the species were subjected to heterogeneous water supply by which either mother ramets or daughter ramets were in high or low soil water supply, respectively, in the Maowusu (Mu Us) Sandy Land of Nei Mongol. The results showed that the phenotypic characteris- tics of the individual ramets of C. epigejos were greatly influenced by the heterogeneous water supply. The ramets treated with high water supply significantly produced more new rhizomes and more offspring (ramets), and accumulated more shoot biomass, and allocated more biomass to their shoots than those treated with low water supply. In comparison with the daughter ramets in homogeneous soil water supply, phenotypic characteristics, in terms of new rhizome growth, the production of new offspring, and the biomass allocation pattern, of the daughter ramets within the pairs of the species were not significantly changed, no matter that high or low soil water supply to mother ramets. The phenotypic responses of mother ramets to soil water supply were similar to those of daughter ramets. From these results, it is inferred that the interconnected ramets of C. epigejos response phenotypically to their local soil water rather than to the soil water experienced by the interconnected ramets. The interconnected ramets of C. epigejos might be independent of each other in water relationship, although they are physically interconnected with rhizome segments. The physiological independence of interconnected ramets might facilitate the risk spreading and thus enhance the genet survivorship under the frequent drought stresses in Mu Us Sandland.

毛乌素沙地根茎禾草拂子茅对异质性水分供应的表型可塑性
张称意  于飞海  陈玉福 董 鸣

(1. 中国科学院植物研究所植被数量生态学重点实验室,北京 100093;2 .内蒙古农业大学,呼和浩特 010019;
3. 中国气象局国家气候中心,北京 100081; 4. 中国科学院地理科学与资源研究所, 北京 100101)


摘要: 拂子茅(Calamagrostis epigejos (L.) Roth.)为根茎型多年生禾草,具细长根茎。为了探讨拂子茅在异质性水分环境中的表型差异,在内蒙古鄂尔多斯高原的毛乌素沙地对拂子茅由母株、子株组成的分株对给予了高水、低水两种不同的异质性土壤水分处理。实验结果表明:土壤水分状况显著地影响着拂子茅分株的生长表型。在高土壤水分条件下,拂子茅的分株产生的根茎、新生后代分株较多,并使生物量主要分配于地上部分,地上生物量积累多;在低土壤水分条件下,拂子茅分株产生较少的根茎与新生后代分株,并且分配到根系的生物量明显增大。在具有一定对比度的异质性土壤水分环境中,拂子茅分株并不因相连的其他分株所处的土壤水分状况而在根茎生长、新生后代分株的产生和生物量分配等特征上,与同质环境中的具有相同土壤水分状况的分株相比,有明显差异。这些结果揭示:拂子茅仅以分株的形式对异质性水分供应发生表型反应;相连的克隆分株在向顶向和向基向这两个基本方向上,不能对另一分株的土壤水分状况在生长表型上发生反应,它们在水分关系上可能是相互相对独立的。分株的相对独立可能有利于在气候干旱、扰动强烈的沙地环境中实现风险分摊,提高基株的存活几率。
关键词: 表型可塑性;异质性土壤水分;拂子茅;分株对;根茎;克隆植物;毛乌素沙地

通讯作者。E-mail: <dongming@95777.com>。

Key words: phenotypic plasticity, heterogeneous soil water, Calamagrostis epigejos , ramet pairs, rhizome,  clonal plants, Maowusu (Mu Us) Sandy Land

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