PEG和钙离子处理对全缘火棘种子萌发的影响

Effects of PEG and Calcium on the Germination of Pyracantha atalantioides Seeds

摘要:

作为用于防治喀斯特地区石漠化的植物物种，在其种子萌发阶段就必须具有较强的适应干旱和富钙土壤的能力。本文研究了喀斯特地区乡土植物全缘火棘种子萌发过程中对干旱和钙离子的耐受能力，用不同水势的PEG6000溶液和不同浓度的CaCl2溶液分别模拟干旱和富钙土壤环境。结果表明，全缘火棘种子萌发对干旱和钙均具有很强的耐受能力，其耐旱能力强于很多其他喀斯特地区乡土植物的种子，甚至强于一些荒漠植物的种子；其对钙离子的耐受能力也明显强于与其在形态和生态特性上非常相似的同属植物火棘的种子。这或许反映了其对喀斯特地区频发干旱并富钙土壤环境的适应，同时也意味着其具有防治喀斯特地区石漠化的巨大潜力。

Abstract:

As a plant species used to prevent and control rocky desertification in karst area, it is necessary to adapt to drought and calcium-rich soil at the stage of seed germination. The tolerance to drought and calcium ions during seed germination of native plants in karst area was studied in this study. The drought and calciumrich soil environments were simulated by PEG6000 solution with different water potential and different concentration of CaCl2 solution. The results showed that the germination of Pyracantha atalantioides seeds had strong tolerance to drought and calcium, and its drought tolerance was stronger than that of many other native plants in karst area, and even stronger than that of some desert plants. Its tolerance to calcium ions was also stronger than that of the seeds of the same genus plant, P. fortuneana, which was similar to P. atalantioides in morphology and ecological characteristics. These may reflect an adaptation of P. atalantioides to drought and calciumrich soil environment in karst area, and may also means that P. atalantioides has a great potential to be used to prevent and control rocky desertification in karst area.