Azcona, I. (Iñaki)
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- Growth and development of pepper are affected by humic substances derived from composted sludge(Wiley, 2011-11) Aguirreolea, J. (Jone); Fuentes-Ramirez, M. (Marta); Azcona, I. (Iñaki); Pascual-Elizalde, I. (Inmaculada); Sanchez-Diaz, M. (Manuel); García-Mina, J.M. (José María)A greenhouse experiment was conducted to evaluate the effects of humic substances extracted from composted sewage sludge on growth, phenological development, and photosynthetic activity of pepper (Capsicum annuum L. cv. Piquillo) plants. Humic substances derived from composted sludge (HSS) were compared with those derived from leonardite (HSL). Two doses of both humic substances were assayed (200 and 500 mg C [L substrate]–1) and compared with a control (C). HSS showed higher nitrogen content and a higher percentage of aliphatic carbon, as well as a lower content of aromatic and phenolic carbon than HSL. HSS significantly increased plant dry-matter production (up to 560%), plant height (86%–151%), and leaf area (436%–1397%) during the early stages of pepper development. Net photosynthesis and stomatal conductance increased in the treatments with HSS (up to 48% and 63%, respectively) at the vegetative stage. In addition, HSS accelerated the phenological development of pepper plants, reducing significantly the number of days to flowering and ripening, which occurred 12 and 14 d earlier than in control plants, respectively. In general, the treatments with HSS and HSL did not markedly affect chlorophyll and nutrient concentrations in the leaves. At maturity, only small differences in total fruit yield, number of fruits per plant, and fruit size were observed between amended and control plants. The results suggest that the mechanisms through which HSS affected plant growth and development were not associated with an improved nutrient uptake. Although the identity of the growth-promoting factors remains to be found, the results suggest that they may be linked to the chemical structure of the humic substances.
- Photosynthetic response of pepper plants to wilt induced by Verticillium dahliae and soil water deficit.(2010) Morales, F. (Fermin); Aguirreolea, J. (Jone); Azcona, I. (Iñaki); Pascual-Elizalde, I. (Inmaculada); Sanchez-Diaz, M. (Manuel)Greenhouse experiments were conducted to compare stress effects caused by Verticilliumdahliae and drought on gas exchange, chlorophyll (Chl) fluorescence and photosynthetic pigments of pepperplants. Three treatments were compared: Verticillium inoculated plants (+V), non-inoculated well-watered plants (−V) and non-inoculated plants subjected to progressive drought (D). Gas exchange, fluorescence and photosynthetic pigments were measured and represented along a gradient of relative water content (RWC) and stomatal conductance (gs). Net photosynthesis (A) and electron transport rate (ETR) decreased, as RWC and gs declined, similarly in both +V and D plants. However, dark respiration (RD) and photorespiration (RL) tended to increase in inoculated plants compared to those subjected to soil drought, as gs decreased. Photoinhibitory damage was not observed in infected or in droughted plants. Soil drought decreased intrinsic PSII efficiency (Φexc.), which seemed to result in part from enhanced xanthophyll cycle- and/or lutein-related thermal energy dissipation. Nevertheless, the fact that 1−Φexc. increased in D only at high values of the de-epoxidation state of the xanthophyll cycle (DPS) suggests that ΔpH could be the major factor controlling thermal energy dissipation in this treatment. By contrast, antheraxanthin, zeaxanthin and lutein, as well as Φexc., were not markedly affected in +V. Water stress appeared to be the main limitation to photosynthesis in Verticillium infected plants, probably through stomatal closure, together with impaired mesophyll conductance (gm). However, our results indicate differential effects of V. dahliae on dark respiration, photorespiration, gm and on the capability of thermal energy dissipation under low gs values
- Growth, yield, and fruit quality of pepper plants amended with two sanitized sewage sludges.(2010) Morales, F. (Fermin); Aguirreolea, J. (Jone); Palma, J.M. (José Manuel); Corpas, F.J. (Francisco Javier); Azcona, I. (Iñaki); Pascual-Elizalde, I. (Inmaculada); Sanchez-Diaz, M. (Manuel); Rellan-Alvarez, R. (Rubén)Organic wastes such as sewage sludge have been successfully used to increase crop productivity of horticultural soils. Nevertheless, considerations of the impact of sludges on vegetable and fruit quality have received little attention. Therefore, the objective of the present work was to investigate the impact of two sanitized sewage sludges, autothermal thermophilic aerobic digestion (ATAD) and compost sludge, on the growth, yield, and fruit quality of pepper plants (Capsicum annuum L. cv. Piquillo) grown in the greenhouse. Two doses of ATAD (15 and 30% v/v) and three of composted sludge (15, 30, and 45%) were applied to a peat-based potting mix. Unamended substrate was included as control. ATAD and composted sludge increased leaf, shoot, and root dry matter, as well as fruit yield, mainly due to a higher number of fruits per plant. There was no effect of sludge on fruit size (dry matter per fruit and diameter). The concentrations of Zn and Cu in fruit increased with the addition of sewage sludges. Nevertheless, the levels of these elements remained below toxic thresholds. Pepper fruits from sludge-amended plants maintained low concentrations of capsaicin and dihydrocapsaicin, thus indicating low pungency level, in accordance with the regulations prescribed by the Control Board of “Lodosa Piquillo peppers” Origin Denomination. The application of sludges did not modify the concentration of vitamin C (ASC) in fruit, whereas the highest doses of composted sludge tended to increase the content of reduced (GSH) and oxidized (GSSG) glutathione, without change in the GSH/GSSG ratio. There were no effects of sludge on the transcript levels of enzymes involved in the synthesis of vitamin C, l-galactono-1,4-lactone dehydrogenase (GLDH) or in the ascorbate−glutathione cycle, ascorbate peroxidase (APX), monodehydroascorbate reductase (MDAR), and glutathione reductase (GR). Results suggest that the synthesis and degradation of ASC and GSH were compensated for in most of the treatments assayed. The application of sanitized sludges to pepper plants can improve pepper yield without loss of food nutritional quality, in terms of fruit size and vitamin C, glutathione, and capsaicinoid contents.
- Growth, yield and physiology of Verticillium-inoculated pepper plants treated with ATAD and composted sewage sludge(Springer Science, 2009) Morales, F. (Fermin); Aguirreolea, J. (Jone); Azcona, I. (Iñaki); Pascual-Elizalde, I. (Inmaculada); Sanchez-Diaz, M. (Manuel)A greenhouse experiment was conducted to investigate the impact of sanitized sewage sludges, ATAD (aerobic thermophilic autothermic digestion) and composted, on Verticillium-induced wilt in pepper plants (Capsicum annuum L. cv. Piquillo). Two doses of ATAD (15 and 30% v/v) and three of composted sludge (15, 30 and 45% v/v) were applied to a peat-based potting mix. Unamended substrate was included as control. Half of the plants were inoculated with V. dahliae, whereas the other half remained non-inoculated. Result showed that ATAD and composted sludge increased growth and yield of non-inoculated plants. V. dahliae reduced net photosynthesis (P n), mainly as a consequence of stomatal closure, 5 weeks after pathogen inoculation. The actual photosystem II efficiency was also reduced and consequently the electron transport rate (ETR). No photoinhibitory damage was observed at this time in diseased plants. At the end of the experiment, diseased plants showed lower plant biomass and fruit yield. ATAD sludge had little effect on the disease. Compost slightly alleviated Verticillium-induced wilt when applied at lower doses (15% v/v), which resulted in increased P n and ETR, and higher plant biomass and fruit yield. By contrast, higher doses of compost (45% v/v) enhanced the effect of the pathogen, which was related to the high substrate salinity in this treatment.