Effect of iron, zinc and manganese shortage-induced change on photosynthetic pigments, some osmoregulators and chlorophyll fluorescence parameters in lettuce

Abstract

Although the beneficial role of Fe, Zn, and Mn on many physiological and biochemical processes is well established, effects of each of these elements on chlorophyll (Chl) a fluorescence and photosynthetic pigment contents is not well studied. The objective of this study was to evaluate effects of Fe, Zn, and Mn deficiency in two lettuce cultivars. The parameters investigated could serve also as physiological and biochemical markers in order to identify stress-tolerant cultivars. Our results indicated that microelement shortage significantly decreased contents of photosynthetic pigments in both lettuce cultivars. Chl a fluorescence parameters including maximal quantum yield of PSII photochemistry and performance index decreased under micronutrient deficiency, while relative variable fluorescence at J-step and minimal fluorescence yield of the dark-adapted state increased under such conditions in both cultivars. Micronutrient deficiency also reduced all parameters of quantum yield and specific energy fluxes excluding quantum yield of energy dissipation, quantum yield of reduction of end electron acceptors at the PSI, and total performance index for the photochemical activity. Osmoregulators, such as proline, soluble sugar, and total phenols were enhanced in plants grown under micronutrient deficiency. Fe, Zn, and Mn deficiency led to a lesser production of dry mass. The Fe deficiency was more destructive than that of Zn and Mn on the efficiency of PSII in both lettuce cultivars. Our results suggest that the leaf lettuce, which showed a higher efficiency of PSII, electron transport, quantum yield, specific energy fluxes, and osmoregulators under micronutrient deficiency, was more tolerant to stress conditions than crisphead lettuce.

Remediated marine sediment as growing medium for lettuce production: assessment of agronomic performance and food safety in a pilot experiment

“…Quality parameters were also influenced by the sediment. Lettuce soluble sugar content is relatively low in comparison with other plant species (about 3 g 100 g −1 FW); nevertheless, they are important as a source of energy for maintaining cell metabolism and for their role in osmoregulation . After harvest, sugars are essential for keeping cells alive and to ensure a long shelf life of the final product .…”

“…Lettuce soluble sugar content is relatively low in comparison with other plant species (about 3 g 100 g −1 FW); 26 nevertheless, they are important as a source of energy for maintaining cell metabolism and for their role in osmoregulation. 29 After harvest, sugars are essential for keeping cells alive and to ensure a long shelf life of the final product. 30 In this study, lettuce sugar concentration was in accordance with those reported by Tesi 26 and Mou 31 and was not affected by the growing medium (Table 3).…”

Pengaruh Media Tanam Hidroponik terhadap Pertumbuhan Bayam (Amaranthus sp.) dan Selada (Lactuca sativa)

“…Dalam penelitian ini, tidak ada perbedaan komposisi nutrisi AB Mix yang digunakan selama kultivasi bayam maupun selada pada ketiga jenis media tanam. Kadar klorofil dapat berbeda secara signifikan apabila komposisi nutrisi hidroponik dijadikan sebagai parameter atau peubah bebas, terutama unsur N (nitrogen) (Warganegara et al, 2015;Wen et al, 2019), S (sulfur) (Skudra & Ruza, 2017), Fe (besi), Zn (seng), dan Mn (mangan) (Roosta et al, 2018).…”

Calcium Carbonate Reduces the Effectiveness of Soil-Added Monosilicic Acid in Cucumber Plants

“…3; Table 2), suggesting that these metabolites, and thereby defence mechanisms of cucumber, are associated with the Si-affected improvement in Fe and Mn availability towards photosynthetic organs. These micronutrients are of importance for photosynthesis and can act as a cofactor for enzymes involved in pathways producing photosynthetic pigments (Roosta et al 2018).…”