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Effects of drought hardening on the carbohydrate dynamics of Quercus acutissima seedlings under successional drought.
Li, Qiang; Liu, Xiao; Sun, Xinke; Zhao, Mingming; Liu, Lele; Wang, Ning; Gao, Qun; Fan, Peixian; Du, Ning; Wang, Hui; Wang, Renqing.
Afiliação
  • Li Q; Institute of Ecology and Biodiversity, School of Life Sciences, Shandong University, Qingdao, China.
  • Liu X; School of Tropical Medicine, Hainan Medical University, Haikou, China.
  • Sun X; Institute of Ecology and Biodiversity, School of Life Sciences, Shandong University, Qingdao, China.
  • Zhao M; Qingdao Forest Ecology Research Station of National Forestry and Grassland Administration, Shandong University, Qingdao, China.
  • Liu L; Qingdao Key Laboratory of Forest and Wetland Ecology, Shandong University, Qingdao, China.
  • Wang N; Shandong Provincial Engineering and Technology Research Center for Vegetation Ecology, Shandong University, Qingdao, China.
  • Gao Q; Institute of Ecology and Biodiversity, School of Life Sciences, Shandong University, Qingdao, China.
  • Fan P; Institute of Ecology and Biodiversity, School of Life Sciences, Shandong University, Qingdao, China.
  • Du N; Institute of Ecology and Biodiversity, School of Life Sciences, Shandong University, Qingdao, China.
  • Wang H; Qingdao Forest Ecology Research Station of National Forestry and Grassland Administration, Shandong University, Qingdao, China.
  • Wang R; Shandong Provincial Engineering and Technology Research Center for Vegetation Ecology, Shandong University, Qingdao, China.
Front Plant Sci ; 14: 1184584, 2023.
Article em En | MEDLINE | ID: mdl-37692418
Introduction: As precipitation patterns are predicted to become increasingly erratic, the functional maintenance of warm-temperate forests constitutes a key challenge for forest managers. In this study, 2-year-old Quercus acutissima seedlings were selected to elucidate the mechanisms whereby they respond to soil water fluctuations and the drought hardening effects on plant carbohydrate dynamics. Methods: Seedlings were trained under different soil water conditions for 2 months: drought (D), well-watered (W), 1-month drought and then 1-month well-watered (D-W), and 1-month well-watered and then 1-month drought (W-D). The functional traits involved in water- and carbon-use strategies were explored at the end of the hardening period. Compared with seedlings in group W, seedlings in groups D, D-W, and W-D had increased potential for carbon uptake (i.e., light saturated point, maximum ribulose-1,5-bisphosphate (RuBP) saturated rate, and electron transport rate) and water uptake (i.e., fine root-to-coarse root ratio) and downregulated growth and mitochondrial respiration to decrease carbon consumption. After water fluctuation hardening, we performed a successional dry-down experiment for 1 month to detect carbohydrate dynamics and explore the acclimation caused by prior hardening. Results and discussion: Our results revealed that there were more soluble sugars allocated in the leaves and more starch allocated in the stems and roots of seedlings hardened in the D, W-D, and D-W treatments than that of seedlings hardened in the W treatment. No significant changes in total non-structural carbohydrates were found. In addition, we found near-zero (seedlings trained by D and D-W treatments) or negative (seedlings trained by W-D treatment) growth of structural biomass at the end of the dry-down experiment, which was significantly lower than that of W-hardened seedlings. This suggests that there was a shift in allocation patterns between carbon storage and growth under recurrent soil drought, which can be strengthened by drought memory. We conclude that Q. acutissima seedlings adjusted water- and carbon-use strategies in response to water fluctuations, whereas stress memory can enhance their overall performance in reoccurring drought. Therefore, taking advantage of stress memory is a promising management strategy in forest nurseries, and drought-trained seedlings might be more suitable for afforestation practices in sites characterized by fluctuating soil water content, considering the ongoing global climatic changes.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Ano de publicação: 2023 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Ano de publicação: 2023 Tipo de documento: Article