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Environmental and experimental botany
Pergamon Press,
Environmental and experimental botany

Pergamon Press,

0098-8472

Environmental and experimental botany/Journal Environmental and experimental botanySCIISTP
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    Phenotypic plasticity couples with transcriptomic flexibility in Leymus chinensis under diverse edaphic conditions

    Sun, YueZhang, XueWang, ShengnanWu, Xuefeng...
    12页
    查看更多>>摘要：Phenotypic plasticity is widespread in all organisms. This biological property is particularly important for sessile organisms like plants to cope with the ever-changing environmental conditions. Leymus chinensis is a predomi-nantly clonal grass that adapts to diverse stressful habitats including drought, cold and salinity-alkalinity. Pre-vious studies suggest that the remarkable environmental adaption of L. chinensis is probably due to its high degree of phenotypic plasticity; however, the underlying molecular mechanism remains unexplored. In this study, we grew L. chinensis clonal plants in four soil types that differ in nutrient content, nitrate-nitrogen con-centration and pH. We observed plasticity in several phenotypic traits in response to specific edaphic factors. By employing de novo RNA-sequencing assembly, we curated differentially expressed genes (DEGs) under each soil type. We found that DEGs under each edaphic condition were enriched for highly specific as well as common GO or KEGG terms known to be biologically relevant to the respective conditions. Moreover, gene activation or silencing was also highly condition-dependent. Together, our results suggest that the high phenotypic plasticity of L. chinensis is likely rooted in its evolved intrinsic property of expressing specific transcriptome profiles in response to diverse niche conditions.
      原文链接:
    • NSTL
    • Elsevier

    Growth and physiological characteristics of four blueberry cultivars under different high soil pH treatments

    Yang, HaoWu, YaqiongZhang, ChunhongWu, Wenlong...
    10页
    查看更多>>摘要：Blueberry is economically important small pulp shrub that prefers to grow in acidic soil, and soil pH is an important factor affecting blueberry growth and development. In this study, one-year-old seedlings of four blueberry cultivars, namely, 'Primadonna', 'Anna', 'Baldwin' and 'Bluegold', were used as experimental mate-rials to study the changes in physiological and biochemical indexes, such as growth potential, osmoregulatory substance levels, antioxidant enzyme activities and antioxidant capacity, of blueberry cultivars under soil pH values of 5.5 (CK), 6.0 (T1), 6.5 (T2), 7.0 (T3) and 7.5 (T4), and the relationships between various indexes were analyzed. The overall results showed that soil pH stress led to deficiency in green color development in blueberry leaves and inhibited plant growth in terms of the height, main basal diameter and biomass (dry weight). Through determination of the blueberry growth phenotype and growth indexes, it was found that the 'Primadonna', 'Anna', 'Baldwin' and 'Bluegold' cultivars had a certain tolerance to high soil pH, and the tolerance threshold was pH 6.5. Correlation and principal component analyses showed that the MDA content, SOD and CAT antioxidant enzyme activities, DPPH free radical scavenging ability, and SPAD values of blueberry leaves were closely related to the growth and dry matter accumulation of blueberry under high soil pH environments; these values were important reference indexes for assessing the adaptation of blueberry to a high soil pH environment. Our study provides a reference for soil management for blueberry cultivation and for research on the mechanism under-lying blueberry resistance to high soil pH.
      原文链接:
    • NSTL
    • Elsevier

    The beneficial functions of blue light supplementary on the biosynthesis of glucosinolates in pakchoi (Brassica rapa L. ssp. chinensis) under greenhouse conditions

    Mao, PengpengLi, QingmingLi, YaminXu, Yaliang...
    9页
    查看更多>>摘要：Blue light can improve the nutritional value of vegetables grown in greenhouse, while the mechanisms about the biosynthesis and accumulation of glucosinolates regulated by light signaling still unknown. Here, the soluble amino acid and glucosinolate profiles under supplementary different blue light intensities (T50, T100, T150) for 10 days were investigated in green-leaf and red-leaf pakchoi. The results indicated that blue light could significantly increase the contents of glucoalyssin, glucobrassicin, glucobrassicanapin, gluconapin and total glucosinolates, and shown a dose effect. The soluble amino acid profiles and the contents of glucosinolates precursor amino acid were also enhanced to varying degrees. Besides, in green-leaf and red-leaf pakchoi, the expression levels of photoreceptor genes under T100 were significantly higher compared with the CK. Supple-mentary blue light also promoted the expression of key transcription factors and key genes of glucosinolate biosynthesis pathway in two cultivars pakchoi. Therefore, the beneficial functions of blue light supplementary on the biosynthesis of glucosinolates in pakchoi under greenhouse conditions are owing to the promoted in the contents of precursor amino acids and the expressions of glucosinolate-related genes mediated by light signal transduction.
      原文链接:
    • NSTL
    • Elsevier

    Proline-rich protein MdPRP6 alters low nitrogen stress tolerance by regulating lateral root formation and anthocyanin accumulation in transgenic apple (Malus domestica)

    Li, DanyangSu, XinjianLei, ZhaolongLi, Mingjun...
    12页
    查看更多>>摘要：Nitrogen (N) is the main nutrient element limiting plant growth and crop yield. Plant proline-rich proteins (PRPs) are a group of structural proteins that are rich in proline and hydroxyproline. Previously, we identified 9 PRPs from the apple genome and found that they were induced by different stress treatments. In this study, we showed that the expression of MdPRP6 was inhibited by low N stress. Transgenic apple plants with decreased MdPRP6 expression were generated by RNA interference (Ri) to explore the biological role of MdPRP6 under low N stress. Ri transgenic apple plants grew better than wild-type (WT) plants under low N stress, as indicated by their well developed roots; greater height, stem diameter, number of leaves, and biomass; and higher photosynthetic capacity and N content. N and starch metabolism were more active in Ri plants than in WT plants. Ri plants accumulated greater amounts of starch and soluble sugar under low N stress, which was consistent with the higher expression levels of related genes in Ri plants relative to WT plants. The accumulation of anthocyanins was higher in Ri plants than in WT plants under low N stress, which helped plants resist the effects of low N stress. The indole acetic acid (IAA) content was higher in the roots of Ri plants, which strengthened the root system. Overall, our data suggested that MdPRP6 negatively regulates low N stress tolerance by modulating anthocyanin accumulation and IAA metabolism in the roots of apple plants.
      原文链接:
    • NSTL
    • Elsevier