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Effects of phylogeny and climate on seed oil fatty acid composition across 747 plant species in China 

 
论文编号:
作者: Zhang JL
刊物名称: Industrial Crops and Products
所属学科:
论文题目英文: Effects of phylogeny and climate on seed oil fatty acid composition across 747 plant species in China
年: 2015
卷: 63
期:
页: 1-8
联系作者: Zhang JL
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影响因子: 3.208
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摘要:

Seed oil has long been recognized as an important source of food, industry and biodiesel. In biologicalaspect, seed oil fatty acid composition (FAC) affects lipid fluidity and cellular metabolism, depending ontemperature. Hence, the variation of FAC in seeds may reflect adaptive strategies for seed survival andseedling establishment under contrasting climate conditions. In this study, we investigated the relativeeffects of phylogeny and climate on seed oil FAC, testing the hypothesis that the degree of fatty acidunsaturation increases in colder climates. A large seed oil FAC dataset representing 747 species from 207sites across China was compiled and a general linear model was used to partition total variance in FACinto taxonomic ranks (family, genus and species) and environmental components. Multiple regressionanalysis was conducted to examine the relative effects of mean annual temperature (MAT) and meanannual precipitation (MAP). Phylogenetically independent contrast (PIC) analysis was used to test theevolutionary association of FAC with climate at the family level. The results showed that seed oil FACvaried considerably across plant species, with phylogeny explaining a greater proportion of variancethan environment; however, FAC showed obvious large-scale spatial patterns. Total unsaturated fattyacid (UFA) content increased with increasing latitude. The degree of fatty acid unsaturation, as indicatedby the ratio of UFA to saturated fatty acids and iodine value, was negatively correlated with MAT and to alesser extent with MAP. The PIC results indicated that at the family level, nearly all significant phenotypiccorrelations of FAC with spatial and climatic variables were evolutionarily convergent. These resultsindicate that despite strong phylogenetic constraints on FAC, fatty acid unsaturation in seed oil appearsto evolve as an adaptive strategy in colder climates. The affiliation of phylogenetic and climate in seedoil FAC may assist in the search of potential oil plants with particular FAC for food and fuel needs.

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