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作 者 ：李桂双;白成科*

期 刊 ：植物研究 2013年 33卷 5期 页码：610-615

关键词：松科；C值；种子千粒重；回归分析；进化；

Keywords:Pinaceae, C-value, 1000-seed weight, linear regression analysis, evolution,

摘 要 ：在检索C值数据库和种子数据库的基础上，对松科具有完整C值和种子千粒重等数据信息的5个属108种植物进行统计分析，并利用线性回归模型分析了二者之间相关性。结果显示，松科植物C值从9.5~36 pg呈正态分布，种子千粒重从1.2~1 269 g呈偏态分布,种间千粒重相差悬殊，高达1058倍。ANOVA分析表明，松属C值平均为25.79 pg，显著高于其它4个属;落叶松属C值最低（12.53 pg)，显著低于云杉属（18.44 pg），而云杉属、冷杉属和雪松属C值间却无显著性差异。结合前人研究结果，从C值的角度分析，松科5属间的演化顺序为：松属→云杉属→雪松属→冷杉属→落叶松属。松科5属间种子千粒重均值差异显著，松属种子均值最大（123.7 g），其次为雪松属（84.5 g）和冷杉属（26.4 g），最后为落叶松属（5.5 g)和云杉属(3.9 g)。除松属外，其它4个属ANOVA分析，雪松属种子千粒重显著高于云杉属、冷杉属和落叶松属（P<0.01)，而云杉属和落叶松属种子千粒重间无显著差异(P>0.05)。对数回归分析和线性相关性分析表明，松科108种植物的C值和种子千粒重回归方程为：y=3.145x-7.248，决定系数（R²）为0.346，存在显著正相关性（P<0.000 1），线性相关系数(γ)高达58.8%，这说明松科植物随着C值增大，其种子千粒重呈明显增加趋势。综上所述，松科属间种子千粒重差异显著，且随着属间进化程度的提高，C值和种子千粒重均呈明显下降趋势，其具体机理尚有待于结合其它功能性状做深入分析。

Abstract:It has been a very interesting study for international scientists to research the evolutional relationship between plant C-value and traits in families or genera. The data of C-value and 1000-seed weight were searched from Plant C-value Database and Seed Mass Information Database, respectively. The relationship was analyzed by ANOVA and regression model for 5 genera 108 species in Pinaceae. The results showed the C-value ranged from 9.5 to 36 pg in a reasonably normal distribution, and the 1000seed weight had a widest distribution from 1.2 to 1269 (approximate 1058 times). The ANOVA analysis results showed the Pinus had the highest mean C-value (25.79 pg) in 5 genera and was significantly higher than those of the other 4 genera. The mean C-value of Larix was the lowest (12.53 pg) and was significant lower than that of Picea (18.44 pg). There was no significant difference among C-values of Picea, Abies and Cedrus. For 5 genera in Pinaceae, there was an evolutional sequence: Pinus→Pieca→Cedrus→Abies→Larix, combining previous research results and our C-values analysis results. The differences of average 1000-seed weight in 5 genera was larger, and it was in the sequence of Pinus (123.7 g), Cedrus (84.5 g), Abies (26.4 g), Larix (5.5 g) and Picea (3.9 g). The 1000-seed weight of Pinus were remarkable higher than those of the others, and the 1000-seed weight of Cedrus were significant higher than those of Abies, Larix and Picea. However, there was no significant difference between Larix and Picea. Linear correlation analysis showed that there was a higher significantly positive correlation between C-value and 1000-seed weight (y=3.415x-7.248, R²=0.346, t-test, P<0.001) and the correlation coefficient was 58.8%, suggesting 1000-seed weight was increased with the C-value increasing in Pinaceae. In conclusion, all the results indicated that the C-value and 1000-seed weight would decline with the improving of evolutionary status, which were closely related to the geographic distribution and spread in Pinaceae. The specific mechanisms need to be further researched.

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