植物种子传播途径与基因组值和千粒重的相关性

Correlations of plant seed dispersal pattern with genome size and 1000-seed mass

种子传播对植物的繁殖、分布和进化至关重要,研究植物基因组、种子千粒重与种子传播途径间相关性,对于揭示植物种子入侵和基因组进化的遗传机制等具有十分重要的意义。本文在前期测定部分植物C值、检索植物C值数据库和种子数据信息库的基础上,对包含完整基因组信息(染色体条数、倍数、C值)、种子千粒重和种子传播途径的235种植物进行了统计和相关性分析。ANOVA结果表明,借助水、鸟、风传播的植物C值(1C水=1.3pg,1C鸟=1.6pg,1C风=2.0pg)和基因组值(1Cx水=1.1pg,1Cx鸟=1.3pg,1Cx风=1.6pg)均显著低于借助动物取食传播植物的(1C动=4.9pg,1Cx动=4.7pg)(P<0.05),但无助力扩散和动物携带与其他4种传播方式间均无显著差异(P>0.05)。235种植物物种间千粒重相差悬殊,就不同传播方式整体而言,以风力和动物携带为传播途径的植物种子千粒重(分别为7.2和13.5g)明显低于以动物取食和水为传播途径的植物种子千粒重(分别为92.5和85.8g),而无助力传播途径与其他5种传播途径的千粒重均没有显著差异(P>0.05)。进一步相关性分析表明,动物取食和水传播方式的植物基因组值和种子千粒重间均呈正相关(相关系数γ=0.33),其中动物取食的植物基因组值与千粒重呈显著正相关性(y=0.67x+3.23,R2=0.11,P=0.04),但在其他传播途径中均无显著相关性。研究结果为揭示植物种子传播、分布和基因组进化等提供参考。

Seed dispersal is essential to the reproduction, distribution, and evolution of plants. To study the correlations of plant seed dispersal pattern with genome size and 1000-seed mass is of significance for revealing the invasion of plant seeds and the mechanisms of genome evolution. In this paper, statistics and correlation analysis were conducted on 235 plant species with corn- plete genome information （chromosomes number, ploidy, seed dispersal patterns, based on the previous estimation and C-value）, 1000-seed mass, and of some plant species C-values and the searching of plant C-value database and seed information database. The ANOVA analysis indica- ted that for the plants whose seeds were dispersed by water, bird, and wind, the C-values （ Cwater =1.3 pg, Cbira=1.6 pg, and Cwina=2.0 pg） and genome sizes （1CXwater=1. 1 pg, 1CXbird=1.3 pg, and 1 Cxwina = 1.6 pg） were significantly lower than those whose seeds were dispersed by ani- mal-eating （ 1 Canimal ： 4. 9 pg, and 1 Cx=ima1 = 4.7 pg） （ P 〈 0.05 ）, but no significant differences were observed among the four dispersal patterns and the unassisted dispersal and animal-carrying pattems （P 〉 0.05 ）. The 1000-seed mass of the 235 species varied greatly. The 1000-seed mass of the plants with seed dispersal by wind and animal-carrying （7.2 g and 13.5 g, respec- tively） were obviously lower than that with seed dispersal by water and animal-eating （85.8 g and 92.5 g, respectively）, but the 1000-seed mass of the plants with unassisted dispersal had no significant differences with that of other dispersal patterns. The further correlation analysisshowed that there existed positive correlations between the genome size and 1000-seed mass of the plants whose seeds were dispersed by animal-eating and water （ γ= 0.33 ）, in which, the correla- tion for the plants whose seeds were dispersed by animal-eating was significant （y = 0.67 x ＋ 3.23, R2 = 0. 11, P = 0.04）. These findings would provide references to reveal the mechanisms of plant seed dispersal, distribution, and genome evolution.