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Phenotypic Plasticities of Thellungiella Salsuginea and Allium Przewalskianum

Author: YaoBuQing
Tutor: LiuJianQuan；DengJianMing
School: Lanzhou University
Course: Ecology
Keywords: Thellungiella Youth sweet leek Phenotypic plasticity Evolution
CLC: Q943
Type: PhD thesis
Year: 2011
Downloads: 96
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Abstract

Phenotypic plasticity is a single genotype or the offspring of the same sources, the ability to produce different phenotypes in response to changing environmental conditions. Some phenotypic plasticity response is adaptive in terms of individual fitness, but some non-adaptive or neutral. Is now generally considered the adaptive plasticity not only help organisms adapt to a variety of environments, but also to promote adaptive evolution of related traits. Phenotypic integration refers to the correlation structure of multiple phenotypic characteristics. The theoretical and experimental studies that to select can act on the the phenotype traits integration evolution. However, relatively few studies of the combination of phenotypic plasticity and phenotypic integration. The papers selected Thellungiella (Thellungiella salsuginea) and the green sweet leek (Allium przewalskianum) for the study of materials, adaptive and evolutionary research they phenotypic plasticity. 1 salt mustard is a salt-tolerant plants, is widely distributed in salted areas of northern China. Under laboratory conditions, measured under salt stress, of Thellungiella growth and physiological ecology traits, phenotypic plasticity and integration of phenotypic characteristics between different populations. The results show that physiological traits is higher than the growth traits plasticity; correlation coefficient of variation for most traits under different salt treatment is relatively large, the lower integration of the plant phenotype. We also measured the different populations of the leaves and roots of the plant phenotypic plasticity. We found that contrary to expectations, showed negative quadratic relationship between leaf length plasticity and environmental heterogeneity, all other traits plasticity level with the changes in the salinity of the habitat growing season did not show a significant change in trend. 2 green sweet leek is a distribution in the Himalayas and the surrounding elevation of 1800m-4500m wild onions genus, including diploid and tetraploid. Tetraploid has a strong adaptability, even distribution of drought, climate variability of the high altitude of the Qinghai-Tibet Plateau region. However, the difference between the information on the nutritional content of the plant as well as the different ploidy has never been reported. In the the green sweet leek study measured the the different ploidy young sweet leek nutrient content and growth characteristics under conditions of homogeneity Park. The diploid nine populations tetraploid 20 populations. The results found that the plant mineral elements and higher than the average content of amino acids belong to other edible leafy plants. Having a faster growth rate and greater biomass compared tetraploid and diploid. And have a high water content and energy, as well as higher cystine and phosphorus content, tetraploid, but a lower cellulose content. Further, located in the high altitude tetraploid than other tetraploid has a larger biomass and protein, fat, crude fat, and mineral elements such as Mg, Fe, Mn and Cu contents are high. Our results show that this ploidy no obvious morphological differences, there are a lot of phenotypic plasticity plants in nutrient content and growth characteristics, these results provide a scientific basis for the further effective utilization of the plant.

Phenotypic Plasticities of Thellungiella Salsuginea and Allium Przewalskianum

Abstract

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