The Effect of Chitosan Hydrolysate on Solanum Lycopersicum Plant Growth

Chitosan is a well-known subjectof researchbecause of its beneficial properties, including its antibacterial and fungicidal activity, as well as its effect on plant physiology. One of the maindifficulties in agricultural chitosan implementation is the poor solubility of high molecular chitosan in water. Reducing themolecular weight of chitosan by acid hydrolysis increases its solubility. This research studied the effect of chitosan hydrolysate on the germination and development ofSolanum lycopersicum L. plants. Theeffects of chitosan hydrolysate on seed germination, shoot development in the first week of development and in the first month of development were evaluated. According to the results, high concentrations of chitosan hydrolysate completely inhibited seed germination. However, short-term treatment by high concentrations of chitosan hydrolysate stimulatedthe development of seedlings, leading to substantially longerroots. Regular root application of high concentrations of chitosan hydrolysate inhibited plant development. Keywords: chitosan hydrolysate, chitosan, plant growth regulators, plant germination

Plant exposure to glyphosate-based herbicides and how this might alter plant physiological and structural processes

Chemical weed control is essential to ensure high levels of productivity in agricultural areas, and glyphosate-based herbicides (GBHs) are the most widely used herbicides at a global scale. GBHs inhibit the 5-enolpyruvyl-shikimate-3-phosphate synthase (EPSPS) enzyme, which impairs the shikimate pathway and often leads to plant death. However, indirect effects of GBHs on plant physiology can also lead to plant death. The objectives of this review are to discuss the biochemical, physiological and structural changes GBH application produces in plant species, in addition to inhibiting EPSPS (EC 2.5.1.19), and to reveal how these changes contribute to plant death. We conclude that GBHs promote plant death not only because of EPSPS inhibition but also due to biochemical, physiological and structural changes. Some changes are recurrent and can be used as biomarkers of GBH sensitivity, which can contribute to future works that monitor the presence of these herbicides in plant communities near agricultural areas.

Development of Plant Physiology E-Modules Based on Contextual Teaching and Learning (CTL) on Photosynthesis and Metabolism Materials Nitrogen Using Software Appypie of Results Student Learning Biology

The strategy and implementation of learning is strongly influenced by the development of science and technology. So the technology that is currently developing must be integrated into the learning process to improve the quality of learning. One of the technology integration is E-Modul. E-Modul is a form of presentation of self-study materials that are arranged systematically into the smallest learning units to achieve certain learning objectives which are presented in an electronic format for each learning activity. E-Modules developed using a contextual approach will This causes students to get more meaningful learning, because they can relate the material to real everyday life. E-Modules are presented systematically so that they contain relevant text, images and videos. Therefore, Appypie Software is used in the development of the Plant Physiology E-Module. The purpose of this research is to produce an E-Module of Plant Physiology based on CTL on the material of Photosynthesis and Nitrogen Metabolism using Appypie Software which is valid, practical and effective. This type of research is development research using the Plomp model. The development phase of this model begins with the Preliminary Research Phase , Development or Prototyping Phase, and the Assessment Phase. The instruments in this study were in the form of a validity assessment sheet, a practicality assessment sheet, a skill and attitude competency assessment sheet and multiple choice questions to assess knowledge competence. The data analysis technique is validity, practicality using modified Likert scale scoring and effectiveness data using t-test using SPSS version 17. The results showed that the CTL-based Plant Physiology E-Module on the materials of Photosynthesis and Nitrogen Metabolism was very valid with a value of 92.21%. The practicality assessment by the lecturers scored 95% with very practical criteria and the student assessment with a score of 82.17% with very practical criteria. The results of the effectiveness test showed that the class that used the CTL-based Plant Physiology E-Module had a higher score than the class that did not use the CTL-based Plant Physiology E-Module, so the use of the E-Module equipped with pictures, animations and videos could help students understand material. It can be concluded that the CTL-based Plant Physiology E-Module that has been developed is in the very valid, very practical, and very effective category in improving student learning outcomes.

Functional Studies of Plant Latex as a Rich Source of Bioactive Compounds: Focus on Proteins and Alkaloids

Latex, a sticky emulsion produced by specialized cells called laticifers, is a crucial part of a plant’s defense system against herbivory and pathogens. It consists of a broad spectrum of active compounds, which are beneficial not only for plants, but for human health as well, enough to mention the use of morphine or codeine from poppy latex. Here, we reviewed latex’s general role in plant physiology and the significance of particular compounds (alkaloids and proteins) to its defense system with the example of Chelidonium majus L. from the poppy family. We further attempt to present latex chemicals used so far in medicine and then focus on functional studies of proteins and other compounds with potential pharmacological activities using modern techniques such as CRISPR/Cas9 gene editing. Despite the centuries-old tradition of using latex-bearing plants in therapies, there are still a lot of promising molecules waiting to be explored.