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seed traits and taxonomic relationships determine the occurrence of mutualisms versus seed predation in a tropical forest rodent and seed dispersal system

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Integrative Zoology 2014年第3期9卷 309-319页

作者： Zhenyu WANG Lin CAO Zhibin ZHANG State Key Laboratory of Integrated Management of Pest Insects and Rodents in Agriculture Institute of ZoologyChinese Academy of SciencesBeijingChina University of Chinese Academy of Sciences BeijingChina

Although many studies have been carried out on plant-animal mutualistic assemblages,the roles of functional traits and taxonomy in determining both whether interactions involve mutualisms or predation and the structure of such assemblages are *** used semi-natural enclosures to quantitatively assess the interaction strengths between seeds of 8 sympatric tree species and 4 rodent species in a tropical forest in Xishuangbanna,Yunnan,Southwest *** found 2 clusters of species in the seed-rodent network represented by 2 genera in the Fagaceae(Castanopsis,Lithocarpus).Compared to seeds of 3 Castanopsis species,seeds with heavy weight,hard coat or caloric content(including 3 Lithocarpus species)were eaten less and more frequently hoarded by *** turn,hoarded seeds showed less predation and more mutualism with *** results suggest that seed traits significantly affected the hoarding behavior of rodents,and,consequently,the occurrence of mutualisms and predation as well as assemblage structure in the plant-animal seed dispersal ***nomically-related species with similar seed traits as functional groups belong to the same substructures in the *** results indicate that both seed traits and taxonomic relationships may simplify thinking about seed dispersal systems by helping to elucidate whether interactions are likely to be dominated by predation or mutualism.

关键词： hoarding behavior mutualism predation seed dispersal seed trait

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Index selection on seed traits under direct,cytoplasmic and maternal effects in multiple environments

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Journal of Genetics and Genomics 2009年第1期36卷 41-49页

作者： Wenying Zhang Haiming Xu Jun Zhu Institute of Bioinformatics College of Agriculture and Biotechnology Zhefiang University Hangzhou 310029 China Institute of Plant Genetics and Breeding College of Agriculture Yangtze University Jingzhou 434025 China

Crop seeds are important sources of protein, oil, and carbohydrates for food, animal feeds, and industrial products. Recently, much attention has been paid to quality and functional properties of crop seeds. However, seed traits possess some distinct genetic characteristics in comparison with plant traits, which increase the difficulty of genetically improving these traits. In this study, diallel analysis for seed models with genotype by environment interaction （GE） effect was applied to estimate the variance-covariance components of seed traits. Mixed linear model approaches were used to estimate the genetic covariances between pair-wise seed and plant traits. The breeding values （BV） were divided into two categories for the seed models. The first category of BV was defined as the combination of direct additive, cytoplasmic, and maternal additive effects, which should be utilized for selecting stable cultivars over multi-environments. The three genetic effects, together with their GE interaction, were included in the second category of BV for selecting special lines to be grown in specific ecosystems. Accordingly, two types of selection indices for seed traits, i.e., general selection index and interaction selection index, were developed and constructed on the first and the second category BV, respectively. These proposed selection indices can be applied to solve the difficult task of simultaneously improving multiple seed traits in various environments. Data of crop seeds with regard to four seed traits and four yield traits based on the modified diallel crosses in Upland cotton （Gossypium hirsutum L.） were used as an example for demonstrating the proposed methodology.

关键词： index selection seed trait mixed linear model approach genotype by environment interaction

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Cultivated walnut trees showed earlier but not final advantage over its wild relatives in competing for seed dispersers

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Integrative Zoology 2017年第1期12卷 12-25页

作者： Hongmao ZHANG Wei CHU Zhibin ZHANG Institute of Evolution and Ecology School of Life SciencesCentral China Normal UniversityWuhanChina State Key Laboratory of Integrated Management of Pest Insects and Rodents in Agriculture Institute of ZoologyChinese Academy of SciencesBeijingChina

Little is known about seeding regeneration of cultivated trees compared to wild relatives in areas where seed dispersers are ***,we investigated the differences in seed fates of cultivated walnut(Juglans regia)and wild Manchurian walnut(Juglans mandshurica)trees under rodent predation and *** seeds have higher nutritional value(large size,mass and kernel mass)and lower mechanical defensiveness(thin endocarp)than *** *** tracked seeds of *** and *** under both enclosure and field conditions to assess differences in competing for seed dispersers of the two co-occurring tree species of the same *** found that rodents preferred to harvest,eat and scatter-hoard seeds of *** as compared to those of *** of *** were removed and scatter-hoarded faster than those of *** of *** were more likely to be rediscovered by rodents than those of *** results suggest that *** showed earlier dispersal fitness but not the ultimate dispersal fitness over *** in seeding regeneration under rodent mediation,implying that *** has little effect on seeding regeneration of *** in the *** effects of seed traits on seed dispersal fitness may vary at different dispersal stages under animal mediation.

关键词： cultivation plant-rodent mutualism seed dispersal seed trait stage-dependent dispersal

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