27 research outputs found

    Water-soluble carbohydrates of root components and activity rhythms at vegetative growth stage of <i>Artemisia scoparia</i> in northeastern grassland of China

    No full text
    <div><p>The root system of perennials is composed of the roots of different growth years. The nutrient storage capacities and activities of roots are an important basis for judging root components and plant senescence. In this research, changes in the contents of water-soluble carbohydrate (WSC) were used as indicators of the nutrient storage and activity of roots of different life years. From the early resprouting stage to the rapid growth stage, <i>Artemisia scoparia</i> L. plants of 1–3 age classes were sampled and measured once every 18 days. The nutrient storage capacities and activity rhythms of plant root components of the three age classes were analysed quantitatively. Among the <i>A</i>. <i>scoparia</i> population in northeast China, the nutrient storage capacities of 1a/2a plant root collars and 2-year old roots were generally large, whereas those of 3a plant root collars and 3-year old roots were significantly reduced. As for changes in the WSC content in the root system at the 18 day resprouting stage, the decline rates in the root collars of the 1a and 2a plants were 102 and 109 times those of the 3a plants, respectively. The decline rate in the 2-year old roots of the 1a plants was 1.8 times that of the 2a plants and 29.6 times that of the 3a plants. When nutrients were most active, all root components of the 1a plants entered into the resprouting stage, but the 2/3-year old roots of the 2a plants lagged behind. All the root components of the 3a plants generally lagged. At the vegetative growth stage, the WSC contents in all root components of the 1a plants declined logarithmically. For the 3a plants, the content in the root collars decreased linearly with that in the 3-year old roots. The older root components (3-year old roots) of the 2a plants and all root components of the 3a plants exhibited signs of aging.</p></div

    Comparison among the <i>Artemisia scoparia</i> plants of three age classes in the contents of water-soluble carbohydrate (WSC) in the root components at different times.

    No full text
    <p>(A, root collars; B, 2-year old root; C, 3-year old root; D, average of same root components of the plants of three age class; In icon from A to C, the letter “a” is age class of the plants which is 1a, 2a, 3a; above the data column(mean±SE), different small letters mean significant difference(p<0.05), NS is no significant difference(p>0.05) in from A to C among three age classes; Am, average of root collars, Bm, average of 2-year old roots, Cm, average of 3-year old roots in D icon; the small letters or NS above the data column(mean±SE) are the same as the meaning from A to C in D among the root components).</p

    Observed values and the logarithmic fitting curves of seasonal changes in the contents of water-soluble carbohydrate (WSC) in the 3-year old roots of 2a and 3a plants of <i>Artemisia scoparia</i>, and the average of total root components.

    No full text
    <p>(C2, 2a plants; C3, 3a plants; Cm, average of 2a and 3a plants; Tm, average of total root components as root collars, 2-yaer old roots and 3-year old roots of the plants of three age classes).</p

    Effect of sowing date on phenological traits and duration of development period (days) of <i>Chenopodium glaucum</i> and <i>Amaranthus retroflexus</i>.

    No full text
    <p>Emergence date, bolting date, flowering date, and death date indicate the date of initiation of each.</p><p>Emergence period, the interval from sowing date to emergence date (emergence date of each sowing was same, here all SE were zero). Vegetative period, the interval from emergence date to bolting date. Flowering period, the interval from bolting date to flowering date. Post-reproductive period, the interval from flowering date to death date. Reproductive period, the interval from bolting date to death date. Life period, the interval from emergence date to death date.</p><p>Values are mean with SE in parentheses.</p><p>Different letters for the same attribute for each plant species indicate significant difference among sowing dates at <i>P</i> < 0.05.</p><p>Effect of sowing date on phenological traits and duration of development period (days) of <i>Chenopodium glaucum</i> and <i>Amaranthus retroflexus</i>.</p

    Biomass and number of seeds of <i>Chenopodium glaucum</i> (y<sub>c</sub>) and <i>Amaranthus retroflexus</i> (y<sub>a</sub>) in relation to the difference in total life period (difference between life period of any given treatment and life period of last sowing date treatment).

    No full text
    <p>Biomass and number of seeds of <i>Chenopodium glaucum</i> (y<sub>c</sub>) and <i>Amaranthus retroflexus</i> (y<sub>a</sub>) in relation to the difference in total life period (difference between life period of any given treatment and life period of last sowing date treatment).</p

    Relationship between biomass of reproductive tissue and total vegetative biomass on a log-log scale for <i>Chenopodium glaucum</i> and <i>Amaranthus retroflexus</i>.

    No full text
    <p>Relationship between biomass of reproductive tissue and total vegetative biomass on a log-log scale for <i>Chenopodium glaucum</i> and <i>Amaranthus retroflexus</i>.</p

    Effect of sowing date on height, crown diameter, biomass accumulation, seed biomass, and seed production (seed number), total biomass, and the slope of the transformed reproductive biomass—vegetative biomass relationship (R-V) of <i>Chenopodium glaucum</i> and <i>Amaranthus retroflexus</i>.

    No full text
    <p>Values are means with SE in parentheses. Different letters for the same attribute within a species indicate statistical difference among sowing date treatmetns at <i>P</i> < 0.05. Slope R-V is the slope of the regression of log transformed reproductive biomass on log transformed vegetative biomass. Intercept values were 0.139 and -0.312 and RMSE values were 0.111 and 0.117 for <i>C</i>. <i>glaucum</i> and <i>A</i>. <i>retroflexus</i>, respectively.</p><p>Effect of sowing date on height, crown diameter, biomass accumulation, seed biomass, and seed production (seed number), total biomass, and the slope of the transformed reproductive biomass—vegetative biomass relationship (R-V) of <i>Chenopodium glaucum</i> and <i>Amaranthus retroflexus</i>.</p

    Biomass of various tissue groups of <i>Chenopodium glaucum</i> (y<sub>c</sub>) and <i>Amaranthus retroflexus</i> (y<sub>a</sub>) in relation to the difference in total life period (difference between life period of any given treatment and life period of last sowing date treatment).

    No full text
    <p>Biomass of various tissue groups of <i>Chenopodium glaucum</i> (y<sub>c</sub>) and <i>Amaranthus retroflexus</i> (y<sub>a</sub>) in relation to the difference in total life period (difference between life period of any given treatment and life period of last sowing date treatment).</p
    corecore