Response of English Oak (Quercus Robur L.) Trees to Biostimulants Application in the Urban Environment

Ferrini, F.; Nicese, F.P.

doi:10.48044/jauf.2002.009

Cited by 13 publications

(5 citation statements)

References 5 publications

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“…Although single leaf measurements are of limited value for assessing the health of an entire tree (Medrano et al 2015), leaf WUE measured on the 'Bartek' oak was similar to values for non-stressed trees (e.g. Renninger et al 2015;Ferrini and Nicese 2002). Thus, based on the measurements of chlorophyll a fluorescence and gas exchange, we conclude that this ancient veteran tree does not show obvious symptoms of photosynthetic and water stress.…”

Section: Discussionsupporting

confidence: 66%

Leaf photosynthetic capacity, trunk wood structure and stem xylem sap flow in 700-years old Quercus robur L.: a pilot study upon oak ‘Bartek’, a natural monument in Poland

Zajączkowska¹,

Dąbrowski²,

Kowalczuk³

et al. 2022

Silva Fenn

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Physiological studies of long-lived trees are particularly important at this time, especially in light of the need for trees to adapt to global climate change. The results of the present studies were obtained on an approximately 700-year-old Quercus robur L. – the ‘Bartek’ oak. The tree has to adapt to changing climatic conditions, starting from the transition between the Medieval Warm Period and the Little Ice Age, up to the present time of rapid global climate change. Tomograph imaging showed decay of the tree trunk interior and revealed that undamaged wood forms a thin layer around the trunk perimeter. Two series of experiments were carried out to assess the physiological state of the tree. The first concerned measurements related to photosynthetic capacity: chlorophyll a fluorescence, gas exchange (CO2 assimilation, transpiration), stomatal conductance and leaf water potential. The second series concerned xylem sap flow velocity and anatomical studies of stem wood. Photosynthetic capacity was within the limits reported for young healthy trees. The diurnal pattern of velocity of xylem sap flow was also typical for young vigorous trees and flow velocity correlated positively with solar radiation and negatively with air relative humidity. Anatomical observations of the outermost wood showed relatively narrow annuals rings with large diameter earlywood vessels. The results indicate that the veteran tree does not show signs of water stress probably due to a good balance of water flow and that leaf area of the canopy needs only the current ring of wood to feed transpiration of the canopy.

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Section: Discussionsupporting

confidence: 66%

Leaf photosynthetic capacity, trunk wood structure and stem xylem sap flow in 700-years old Quercus robur L.: a pilot study upon oak ‘Bartek’, a natural monument in Poland

Zajączkowska¹,

Dąbrowski²,

Kowalczuk³

et al. 2022

Silva Fenn

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“…Whereas lower concentration (0.5, 1, 2 cm 3 /l) increased all the previous traits. Ferreni and Nicese (2003) found no statistical differences in shoot growth of Quercus robur L. plant treated with algae compared to control. These results were for both cultivars in both seasons.…”

Section: The Effect Of Foliar Application With Yeast Extract Humic Ac...mentioning

confidence: 64%

Response of pot marigold plant (Calendula officinalis L.) to spraying with some growth biostimulants

Taih,

El-Emary,

El-Fawy

2023

Archives of Agriculture Sciences Journal

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Two field experiments were conducted in the farm of the Department of Agricultural Botany, Faculty of Agriculture, Al-Azhar University, Assiut, Egypt. during the two winter seasons 2021/2022 and 2022/2023, in order to study the effect of some growth stimulants such as yeast extract (5, 10, 15 g/l), humic acid (0.5, 1, 1.5 g/l) and algae extract (4, 6, 8 cm 3 /l) on some morphological, physiological and floral characteristics of two cultivars of calendula officinalis plant double flower and single flower compared to control (tap water). The results showed that the double flower cultivar was significantly superior in morphological characteristics (plant height, number of branches / plants, stem diameter, number of leaves, leaf area (cm 2 ) plant -1 , fresh weight and dry weight) except for the characteristics of plant height in the first season and the number of branches in the second season where the opposite happened. Single flower cultivar also caused significant superiority in the physiological characteristics, namely (chlorophyll a, chlorophyll b, total chlorophyll, total carotenoid in the leaves) except for total carotenoid in flowers for both seasons. As for the floral characteristics, which are (diameter of inflorescence, number of rays (flowers) / inflorescence, fresh and dry weight of the inflorescences / plant), the double flower cultivar recorded the highest results compared to the single flower cultivar except for number of inflorescences / plant where the opposite happened. The results also recorded that foliar spraying of yeast extract at (5, 10 and 15 g/l), humic acid at (0.5, 1, 1.5 g/l) and algae extract at (4 cm 3 /L) improved the morphological, physiological and floral characteristics of both cultivars of calendula officinalis during the two study seasons compared to control (tap water). On the contrary, spraying with algae extract at (6, 8 cm/l) caused a noticeable decrease in the morphological, physiological and floral characteristics me ntioned above for both cultivars of calendula officinalis during the two seasons of the study compared to control (tap water). Finally, the study showed that the use of yeast extract at a concentration of 10 g/l followed by humic acid at a concentration of 1 g/l as growth biostimulants sprayed on the calendula officinalis plant has caused a significant improvement in morphological, physiological and floral characteristics, es pecially with the double flower cultivar, and this is confirmed by the results under the same study conditions .

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“…Pascale et al [71] reported that the application of Trichoderma harzianum improved the total amount of polyphenols and antioxidant activity in grapes. Overall, individual positive effects of biostimulants on the biosynthesis of sugar in different plants were reported by several authors [72,73]. They mentioned that the higher biosynthesis of sugar could be associated with the higher chlorophyll content, chlorophyll fluorescence, net photosynthesis, and photosystem II efficiency.…”

Section: Impact Of the Biostimulantsmentioning

confidence: 97%

Biostimulants Promote Plant Development, Crop Productivity, and Fruit Quality of Protected Strawberries

et al. 2022

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Berries such as strawberries are recognized as a significant constituent of healthy human diets owing to their bioactive secondary metabolites. To improve crop sustainability, yield and berry quality, alternative production systems should be proposed such as organic farming and the use of biostimulants. Thus, we have compared within a complete randomized block design seven biostimulant treatments: 1-control, 2-seaweed extract, 3-Trichoderma, 4-mycorrhiza, 5-mixture of three bacteria, 6-combination of mycorrhiza + bacteria, and 7-citric acid. Strawberry plants were grown in conventional high tunnel (CH), conventional greenhouse (CG) and organic greenhouse (OG). Our results showed that biostimulants did not impact the soil microbial activity (FDA) when compared with the control. Leaf chlorophyll content and photosynthetic leaf performance were not affected by any studied biostimulants. Bacteria, citric acid, and the combination of mycorrhiza + bacteria increased the number of flowering stalks compared with the control in CH, while bacteria increased the crown diameter and all biostimulants increased fresh and dry shoot plant biomass. Citric acid increased leaf Ca content in CG, when all biostimulants increased leaf N content in CH. Studied biostimulants increased berry productivity in CH, while citric acid treatment had the highest yield in CG. The anthocyanins content increased with the use of biostimulants in CH, whereas Trichoderma (CG) and the combination of mycorrhiza + bacteria (OG) increased the Brix, total polyphenols, and anthocyanin contents of the berries compared with the control.

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Response of English Oak (Quercus Robur L.) Trees to Biostimulants Application in the Urban Environment

Cited by 13 publications

References 5 publications

Leaf photosynthetic capacity, trunk wood structure and stem xylem sap flow in 700-years old Quercus robur L.: a pilot study upon oak ‘Bartek’, a natural monument in Poland

Leaf photosynthetic capacity, trunk wood structure and stem xylem sap flow in 700-years old Quercus robur L.: a pilot study upon oak ‘Bartek’, a natural monument in Poland

Response of pot marigold plant (Calendula officinalis L.) to spraying with some growth biostimulants

Biostimulants Promote Plant Development, Crop Productivity, and Fruit Quality of Protected Strawberries

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