草地学报2026，Vol.34Issue(7)：2393-2402,10.DOI:10.11733/j.issn.1007-0435.2026.07.005
少花蒺藜草异型种子对光照和水分条件的差异化适应策略研究
Divergent Adaptation of Cenchrus spinifex Heteromorphic Seeds to Light and Water Conditions
摘要
Abstract
Seed heteromorphism is a critical adaptive strategy for invasive plants to cope with environmental het-erogeneity.To investigate the response mechanisms of heteromorphic seeds of Cenchrus spinifex,we examined germination characteristics of its two seed types(M-type:larger;P-type:smaller)under varying light(com-plete darkness vs.12 h light/12 h dark)and moisture conditions(simulated by PEG gradients).Subsequent seedling growth,biomass allocation,and phenotypic plasticity were analyzed in response to the interaction between water availability(normal,mild,and severe drought)and light intensity(high and low intensity).The results showed that germination was unaffected by light but strongly inhibited by water stress;under severe drought,M-type seeds outperformed P-types in root length,bud length,and biomass.As seedlings,M-type plants showed higher phenotypic plasticity in morphological traits(plant height,tiller number,leaf area),favor-ing increased aboveground resource investment for rapid life cycle completion,whereas P-type plants exhibited greater plasticity in biomass allocation,enhancing stress tolerance through increased root biomass proportion.In summary,the complementary germination and growth strategies of heteromorphic seeds in C.spinifex repre-sent an effective"bet-hedging"mechanism,which is crucial for its successful invasion and spread across envi-ronmentally stressful and variable habitats.关键词
入侵植物/少花蒺藜草/种子异型性/表型可塑性/生物量分配Key words
Invasive plants/Cenchrus spinifex Cav./Seed heteromorphism/Phenotypic plasticity/Biomass allocation分类
农业科技引用本文复制引用
曹婧,王文慧,李振松,戎郁萍..少花蒺藜草异型种子对光照和水分条件的差异化适应策略研究[J].草地学报,2026,34(7):2393-2402,10.基金项目
山东省自然科学基金青年项目(ZR2025QC246) （ZR2025QC246）
国家现代农业产业技术体系(CARS-34)资助 （CARS-34）
