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岷江柏与巨柏种子萌发及生理指标比较

Comparison of Sprouting and Physiological Indicators between Cupressus chengiana and Cupressus gigantea

  • 摘要: 岷江柏(Cupressus chengiana)与巨柏(Cupressus gigantea)属于国家重点保护植物,是我国横断山区主要经济、生态多用途造林树种,研究其种子特性、萌发规律以及环境条件对种子萌发的影响,在生态恢复,生物多样性保护、资源保护等方面具有重要意义。本研究选择亲缘关系较近的岷江柏和巨柏为研究对象,进行种子萌发试验。研究结果表明:1)岷江柏种子的横径、纵径、厚度以及千粒质量等指标均高于巨柏种子,种子形态差异显著;2)岷江柏和巨柏种子可溶性蛋白质含量差异显著,巨柏(0.0687±0.0204 mg·g−1高于岷江柏(0.0459±0.0100 mg·g−1);3) 岷江柏和巨柏种子营养物质含量相关性表现一致,可溶性蛋白与可溶性糖含量呈负相关、与粗脂肪含量呈正相关,可溶性糖与粗脂肪含量呈负相关;4)岷江柏与巨柏种子萌发最适温度均为25℃,发芽率差异不显著,巨柏发芽率略高;低温(−10℃)处理有利于岷江柏种子萌发。

     

    Abstract: Cupressus chengiana and Cupressus gigantea belong to the national key protected plants and are the main economic and ecological multi-purpose afforestation species in Hengduan Mountain region of our country. The seed characteristics, germination laws and effects of environmental conditions on seed germination are studied. Biodiversity protection and resource protection are of great significance. In this study, Cupressus chengiana and Cupressus gigantea were selected as the research objects for seed germination test. The results showed as follows: 1) The transverse diameter, longitudinal diameter, thickness and 1000-grain weight of Cupressus chengiana seeds were higher than those of Cupressus gigantea seeds, and the seed morphology was significantly different. 2) There was significant difference in seed soluble protein content between Cupressus chengiana and Cupressus gigantea. Cupressus gigantea seed soluble protein content (0.0687±0.0204 mg·g−1) was higher than Cupressus chengiana (0.0459±0.0100 mg·g−1). The content of soluble protein was negatively correlated with soluble sugar, positively correlated with crude fat, and the content of soluble sugar was negatively correlated with crude fat. 3) The optimum temperature for seed germination was about 25℃, and there was no significant difference in germination rate, while the germination rate was slightly higher. Low temperature (−10℃) treatment was beneficial to seed germination of Cupressus chengiana.

     

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