Impact of Meloidogyne incognita (nematode) infection on root tissues and cell wall composition of okra (Abelmoschus esculentus L. Moench, Malvaceae)

Root-knot nematodes are endoparasites whose mature females lodge and grow inside the root of some cultivated plants, leading to losses in productivity. Herein, we investigated if the infection of okra, Abelmoschus esculentus (Malvaceae), promoted by the root-knot nematode Meloidogyne incognita (Meloidogynidae) changes some agronomic traits of the host plant, as well as the cell wall composition of the root tissues. The okra Santa Cruz 47® cultivar was infected with a suspension of 5000 M. incognita juveniles. The inoculated and non-inoculated okra plants were then submitted to morphological analysis at the end of experiment, as well as histological (at 4, 11, 18, 39, ad 66 days after inoculation) and immunocytochemical analysis (control and 66 days after inoculation). Root-knot nematode infection reduced the dry weight of the stem system but, unexpectedly, the number and weight of fruits increased. At 11 days after inoculation, we detected the presence of giant cells that increased in number and size until the end of the experiment, at 66 days after inoculation. These cells came from the xylem parenchyma and showed intense and moderate labeling for epitopes recognized by JIM5 and JIM7. The presence of homogalacturonans (HGs) with different degrees of methyl esterification seems to be related to the injuries caused by the nematode feeding activity and to the processes of giant cell hypertrophy. In addition, the presence of HGs with high methyl-esterified groups can increase the cell wall porosity and facilitate the flux of nutrients for the root-knot nematode.

"It may also have prevented churchgoers from falling asleep": southernwood, Artemisia abrotanum L. (fam. Asteraceae), in the church bouquet, and its contemporary presence as a heritage plant in Sweden

INTRODUCTION

Southernwood, Artemisia abrotanum L., is a plant that has been cultivated for centuries. Most probable is that it has its origin in the eastern Mediterranean area. It has been kept for its fragrance and has a history of being a medicinal and insect-repellent plant. In earlier centuries, the plant was commonly found in peasants' gardens in Sweden and utilised especially as a component in the bouquets brought to church by women. The aim of this article is to bring together data about Artemisia abrotanum and to summarise its cultural history and folk botanical importance. In Sweden, it is still grown in some gardens in the countryside and is esteemed for its fragrance.

METHODS

In the early twentieth century, various folklore archives in Sweden (Lund, Uppsala) distributed questionnaires about the use of church bouquets. These records provided interesting information about the importance of southernwood and other species. We have also used data found in ethnographic records and local historical reports. Between 2007 and 2017, a nationwide inventory organised by the Programme for Diversity of Cultivated Plants (POM) documented and gathered several heirloom varieties of southernwood.

RESULTS AND DISCUSSION

Together with a few other domestic plants of foreign origin (e.g. Lavandula angustifolia Mill., Tanacetum balsamita L., and Tanacetum vulgare L.), Artemisia abrotanum has been cultivated throughout Sweden in peasants' gardens as a medicinal plant and for its fragrance. According to the sources, Artemisia abrotanum was one of the most common species cultivated by the Swedish peasantry. Although used in folk medicine and to some extent as a repellent, it was most esteemed for its fragrance. Peasant women would carry a twig of the plant in the obligatory church bouquet or in the hymnal when attending the services in the Lutheran church on Sundays. In Sweden, this custom with the church bouquet has been known since the time of the Reformation in the sixteenth century and survived until the late nineteenth century, when major changes took place in connection with industrialisation, modernisation, secularisation and urbanisation. Although the custom with the church bouquet disappeared, nationwide inventories conducted by the Programme for Diversity of Cultivated Plants in 2007-2015 revealed that the plant still exists in many gardens on the countryside throughout Sweden as a cultural relict and reminiscence plants. People care for the plant, have sentiments for it and it is spread from person-to-person. Several heirloom varieties have been discovered, which will be preserved ex situ for the future.

CONCLUSIONS

Southernwood was probably the most commonly used herb in the peasant women's church bouquet until the end of the nineteenth century. It had a satisfying fragrance and was easy to grow. Although the custom has disappeared, the plant has survived until the present day in many gardens as a reminiscence of the custom of former times.

Use of cultivated plants and non-plant remedies for human and animal home-medication in Liubań district, Belarus

BACKGROUND

To use any domestic remedy, specific knowledge and skills are required. Simple logic dictates that the use of wild plants in the context of limited interaction with nature requires prior identification, while in the case of non-plant remedies and cultivated plants this step can be omitted. This paper aims to document the current and past uses of non-plant remedies and cultivated plants in the study region for human/animal medication; to analyze the human medicinal and veterinary use areas in the context of the remedy groups; to qualitatively compare the results with relevant historical publications; and to compare the intensity and purpose of use between the remedy groups.

METHODS

During field studies 134 semi-structured interviews were conducted with locals from 11 villages in the Liubań district of Belarus. Currently used home-remedies as well as those used in the past were documented by employing the folk history method. The subject was approached through health-related uses, not by way of remedies. Interview records were digitalized and structured in Detailed Use Records in order to ascertain local perceptions. An Informant Consensus Factor (FIC) was calculated for remedy groups as well as for different use categories.

RESULTS

In the human medication area the use of nearby remedies was neither very diverse nor numerous: 266 DUR for 45 taxa belonging to 27 families were recorded for cultivated plants along with 188 DUR for 58 different non-plant remedies. The FIC values for both remedy groups were lower than for wild plants. In the ethnoveterinary medicine use area there were 48 DUR referring to the use of 14 cultivated plant taxa from 12 families and 72 DUR referring to the use of 31 non-plant remedies. The FIC value for the whole veterinary use area of cultivated plants was relatively low, yet similar to the FIC of wild plants.

CONCLUSIONS

Differences between remedy groups were pronounced, indicating that in domestic human medicine cultivated plants and non-plant remedies are either remarkably less important than wild ones or not considered worth talking about. In ethnoveterinary medicine non-plant remedies are almost equally important as wild plants, while cultivated plants are the least used. People in study area seem to still more often rely on, or are more willing to talk to strangers about, wild plants, as promoted by both official medicine and popular literature.