المؤلفون: Makoto Watanabe, Toshihiro Watanabe, Yoko Watanabe, Satoshi Kitaoka, Qu Laiye, Takayoshi Koike

المصدر: Plants
Plants, Vol 9, Iss 1278, p 1278 (2020)
Volume 9
Issue 10

مصطلحات موضوعية: 0106 biological sciences, Canopy, heterophyllous shoots, Psat–N relation, year-to-year variation, Plant Science, Photosynthesis, 010603 evolutionary biology, 01 natural sciences, Article, nitrogen remobilization rate, Japanese larch (Larix kaempferi), Water content, Ecology, Evolution, Behavior and Systematics, Jmax–N, J(max)-N, Vcmax–N, Ecology, biology, P-sat-N relation, fungi, Botany, food and beverages, biology.organism_classification, Photosynthetic capacity, V-cmax-N, Horticulture, Deciduous, QK1-989, Shoot, Larix kaempferi, Larch, 010606 plant biology & botany

الوصف: Japanese larch (Larix kaempferi = L. leptolepis) is often characterized by its high growth rate with heterophyllous shoots, but the functional differences of heterophyllous shoots still remain unclear. Recently, abrupt high temperature and drought during spring induced high photosynthetic rate via change in leaf morphology of the deciduous habit. In order to reveal the photosynthetic characteristics of both short and long-shoot needles of sunny canopy of the larch trees using a canopy tower, we calculated the seasonal change of gas exchange characters and leaf mass per area (LMA) and foliar nitrogen content (N) of heterophyllous needles: short and long-shoot needles over 3 years. No marked difference in light-saturated photosynthetic rates (Psat) was observed between short and long shoots after leaf maturation to yellowing, although the difference was obvious in a specific year, which only shows that seasonal change in temperature and soil moisture determines the in situ photosynthetic capacity of needles. The large annual and seasonal variations in Psat in both shoots were found to be mainly determined by climatic variations, while shoot types determined the strategy of their photosynthetic N utilization as well as the stomatal regulation.

وصف الملف: application/pdf

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fde7b107649ecdcf97f09e848a4d5c84Test
http://europepmc.org/articles/PMC7601333Test

المؤلفون: Kyla A. Stigter, William C. Plaxton

المصدر: Plants
Plants, Vol 4, Iss 4, Pp 773-798 (2015)

مصطلحات موضوعية: Senescence, leaf senescence, nutrient remobilization, Review, Plant Science, Biology, Sink (geography), Phosphorus metabolism, Crop, lcsh:Botany, Botany, purple acid phosphatase, phosphate transport, Ecology, Evolution, Behavior and Systematics, Phosphate transport, 2. Zero hunger, chemistry.chemical_classification, Developmental stage, geography, geography.geographical_feature_category, Ecology, fungi, phosphorus metabolism, food and beverages, 15. Life on land, lcsh:QK1-989, (ribo)nuclease, chemistry, phosphorus-use efficiency, Plant species, Essential nutrient, phosphodiesterase

الوصف: Leaf senescence, being the final developmental stage of the leaf, signifies the transition from a mature, photosynthetically active organ to the attenuation of said function and eventual death of the leaf. During senescence, essential nutrients sequestered in the leaf, such as phosphorus (P), are mobilized and transported to sink tissues, particularly expanding leaves and developing seeds. Phosphorus recycling is crucial, as it helps to ensure that previously acquired P is not lost to the environment, particularly under the naturally occurring condition where most unfertilized soils contain low levels of soluble orthophosphate (Pi), the only form of P that roots can directly assimilate from the soil. Piecing together the molecular mechanisms that underpin the highly variable efficiencies of P remobilization from senescing leaves by different plant species may be critical for devising effective strategies for improving overall crop P-use efficiency. Maximizing Pi remobilization from senescing leaves using selective breeding and/or biotechnological strategies will help to generate P-efficient crops that would minimize the use of unsustainable and polluting Pi-containing fertilizers in agriculture. This review focuses on the molecular mechanisms whereby P is remobilized from senescing leaves and transported to sink tissues, which encompasses the action of hormones, transcription factors, Pi-scavenging enzymes, and Pi transporters.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::65c169ec3873e10f7f29db93110106beTest
https://doi.org/10.3390/plants4040773Test

المؤلفون: Jean-Christophe Avice, Marie-Françoise Niogret, Alain Bouchereau, Philippe Etienne, Marine Poret, Françoise Le Cahérec, Alexandra Girondé, Jacques Trouverie, Laurent Leport

المساهمون: Ecophysiologie Végétale, Agronomie et Nutritions (EVA), Institut National de la Recherche Agronomique (INRA)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU), Institut de Génétique, Environnement et Protection des Plantes (IGEPP), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-AGROCAMPUS OUEST, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université de Rennes 1 (UR1), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Amélioration des Plantes et Biotechnologies Végétales (APBV), Institut National de la Recherche Agronomique (INRA)-Université de Rennes 1 (UR1), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut National de la Recherche Agronomique (INRA), Institut National de la Recherche Agronomique (INRA)-Université de Rennes (UR)-AGROCAMPUS OUEST

المصدر: Plants, Vol 5, Iss 1, p 1 (2015)
Plants
Plants, MDPI, 2016, 5 (1), pp.1. ⟨10.3390/plants5010001⟩
Plants; Volume 5; Issue 1; Pages: 1
Plants, 2016, 5 (1), pp.1. ⟨10.3390/plants5010001⟩

مصطلحات موضوعية: 0106 biological sciences, Proteases, proteolysis, medicine.medical_treatment, Proteolysis, Plant Science, Vacuole, Biology, Protein degradation, Brassica napus, N remobilization, genotypic variability, acidic proteases, 01 natural sciences, Article, Serine, 03 medical and health sciences, Abscission, lcsh:Botany, Botany, medicine, [SDV.BV]Life Sciences [q-bio]/Vegetal Biology, Plant breeding, ComputingMilieux_MISCELLANEOUS, Ecology, Evolution, Behavior and Systematics, 030304 developmental biology, 2. Zero hunger, 0303 health sciences, Protease, Ecology, medicine.diagnostic_test, food and beverages, lcsh:QK1-989, Biochemistry, 010606 plant biology & botany

الوصف: Winter oilseed rape is characterized by a low N use efficiency related to a weak leaf N remobilization efficiency (NRE) at vegetative stages. By investigating the natural genotypic variability of leaf NRE, our goal was to characterize the relevant physiological traits and the main protease classes associated with an efficient proteolysis and high leaf NRE in response to ample or restricted nitrate supply. The degradation rate of soluble proteins and D1 protein (a thylakoid-bound protein) were correlated to N remobilization, except for the genotype Samouraï which showed a low NRE despite high levels of proteolysis. Under restricted nitrate conditions, high levels of soluble protein degradation were associated with serine, cysteine and aspartic proteases at acidic pH. Low leaf NRE was related to a weak proteolysis of both soluble and thylakoid-bound proteins. The results obtained on the genotype Samouraï suggest that the timing between the onset of proteolysis and abscission could be a determinant. The specific involvement of acidic proteases suggests that autophagy and/or senescence-associated vacuoles are implicated in N remobilization under low N conditions. The data revealed that the rate of D1 degradation could be a relevant indicator of leaf NRE and might be used as a tool for plant breeding.

وصف الملف: application/pdf

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3c43b1993cb97d1197f5bac4a316a2fcTest
http://www.mdpi.com/2223-7747/5/1/1Test