We used 14C tracers to determine photosynthate distribution in cherrybark oak (Quercus pagoda Raf.) seedling sprouts following release from competing mid-story vegetation. Fall acquisition of labeled photosynthates by seedlings followed expected source-sink patterns, with root and basal stem tissues serving as the primary sinks. Four months after the seedlings had been labeled with 14C, they were clipped to induce sprouting. First-flush stem and leaf tissues of the resulting seedling sprouts were the primary sinks for labeled photosynthates stored in root tissues. Second-flush stem and leaf tissues, and first-flush stem and leaf tissues the following growing season, were not primary sinks for labeled photosynthates stored in root tissues despite the high radioactivity in root tissues. Root tissues appeared to deposit photosynthates in a layering process whereby the last photosynthates stored in new xylem were the first to be depleted during the initiation of a growth flush the following spring. There were more labeled photosynthates in roots of released seedling sprouts compared with non-released seedling sprouts, indicating increased vigor of released seedling sprouts in response to greater light availability. In contrast, stem and source leaf tissues of non-released seedling sprouts contained greater percentages of labeled photosynthates compared with released seedling sprouts, indicating either greater sink strength or poorly developed xylem and phloem pathways that created inefficiencies in distribution to root tissues. The 14C distribution coefficients confirmed the distribution patterns and provided additional information on the important sinks in released and non-released cherrybark oak seedling sprouts.
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http://dx.doi.org/10.1093/treephys/23.16.1137 | DOI Listing |
Braz J Biol
January 2025
Instituto Federal de Educação, Ciência e Tecnologia do Rio Grande do Sul - IFRS, Núcleo de Ciências Biológicas e Ambientais, Sertão, RS, Brasil.
The shrub Rubus erythroclados Mart. ex Hook.f.
View Article and Find Full Text PDFJ Agric Food Chem
January 2025
College of Food Science and Nutritional Engineering, China Agricultural University, No.17 Qinghua East Road, Haidian District, Beijing 100083, China.
An alginate lyase (FsAly7) from sp. was engineered by directed evolution to improve its optimum temperature and thermostability. The optimum temperature of the positive mutant mFsAly7 (FsAly7-Ser43Pro) was increased by 5 °C, and the thermal inactivation half-lives at 40 and 45 °C were 4.
View Article and Find Full Text PDFMolecules
November 2024
Department of Pharmacy and Ecological Chemistry, Institute of Chemistry, University of Opole, Oleska 48, 45-052 Opole, Poland.
Among various environmental factors, light is a crucial parameter necessary for the germination of some seeds. Seed germination is an important phase in the plant life cycle, when metabolic activity is resumed and reserves are mobilized to support initial plant development. Although all nutrients are extremely important for proper physiological and biochemical development of plants, phosphorus (P) seems to play a special role, as it is an essential component of all important structural and functional substances which compose the cells of plants.
View Article and Find Full Text PDFIndian J Microbiol
December 2024
Department of Nanoscience and Technology, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu 641 003 India.
Unlabelled: Volatiles produced by the leaves of medicinal plants are increasingly used as a new plant disease management strategy due to their induction of diverse antimicrobial activities, it is highly essential for the development of a new phyto-fumigant product to sustain crop production. The present study attempted to find the active role of associated volatile formulation in the suppression of the growth of under pot culture and field conditions. Damping off disease-causing is a devastating disease that infects the tomato crop from seed sprouting to the seedling stage.
View Article and Find Full Text PDFFood Chem
March 2025
Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences/Key Laboratory of Agro-Products Processing, Ministry of Agriculture, Beijing 100193, China; Western Agricultural Research Center, Chinese Academy of Agricultural Sciences, Changji, China. Electronic address:
Selenium-enriched peptides (SePPs) were isolated from Se-enriched soybean sprouts as the selenium (Se) supplement. The preparation of SePPs was optimised, and their Se content, stability during drying, and absorption properties, were examined. The maximum in vitro antioxidant activity of SePPs was achieved after 5 h of alcalase, at 50 °C, pH 9, 3 % substrate concentration, and 5 % enzyme concentration.
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