Morpho-histological analysis of tomato (Solanum lycopersicum L.) plants after treatment with juglone

Abstract

Juglone is a substance that limits plant growth and has a toxic effect on plant development. In this study, we analyzed the influence of juglone at two different concentrations (10 −3 M and 10 −4 M), which were applied to different parts of Solanum lycopersicum L. plants (root system, stem after decapitation, and surface of a younger leaf or after autografting) for a short period of time (7 days), on the morphology and histology of stems. At a lower concentration, juglone had positive effects on plant growth, which resulted in an increase in interfascicular cambial cell divisions, faster development of a continuous cambium layer along the stem circumference, and development of fibers. Additionally, under the influence of juglone, the number of developing leaves increased and adventitious roots developed. The results are discussed based on the current literature concerning the reaction of plants to juglone and to stress conditions.

Tomato Graft Union Failure Is Associated with Alterations in Tissue Development and the Onset of Cell Wall Defense Responses

“…Functional grafts 10 DAG showed callus cell clusters (undifferentiated cells), adhesion between scions and rootstocks, and vascular reconnections (Figure S2), all of which were generating the union callus (Figure S2a-d). These findings are compatible with the previous works about tomato graft histology [12,[25][26][27] and the general hypothesis of callus generation in graft unions [14]. Additionally, they shed light on graft tissues development, especially with regard to how vascular connections are made.…”

Allelopathic Influence of Juglans Regia L. Aqueous Extract Germination and Growth of Lettuce and Tomato

“…In their research, they have shown that lower concentrations of juglone (in the range of 10 -4 M to 10 -6 M) stimulate the germination of some species. In most experiments, a concentration of 10 -3 M juglone is very detrimental to plant growth (Rietveld, 1983;Milewska-Hendel, 2017). The same was observed in this paper, i.e.…”