Effect of thiamethoxam on photosynthetic pigments and primary photosynthetic reactions in two maize genotypes (

Abstract

Neonicotinoid insecticides are used against the wide range of pests to protect plants. The influence of neonicotinoids on target and non-target insects is well understood. Hence, there are controversial opinions about the effect of neonicotinoids on the plants. We investigated pigments and photosynthetic primary reactions in two maize genotypes (the inbred line zppl 225 and hybrid zp 341) under thiamethoxam (TMX) treatment by root irrigation. It was found that the effect of TMX depended on pesticide application techniques and selection of maize genotype. TMX was added to the soil by root irrigation on the 4th and 8th days after planting, and photosynthetic characteristics monitored on the 10th and 12th days after planting. The primary photochemical reactions in PSII (Fv/Fm) of both maize genotypes were not affected under two variants of TMX treatment during all growing period. The hybrid zp341 was shown to be more susceptible to both TMX treatments, demonstrating a decrease in photosynthetic characteristics (JIP-test parameters) as well as changes in the content of pigments and in the conformation of the carotenoid molecule. Our findings suggest that the combination of fluorescence method and Raman spectroscopy is a perspective tool for monitoring plant state under pesticide application.

Knocking Out the Transcription Factor OsNAC092 Promoted Rice Drought Tolerance

“…Photosynthesis is the most fundamental and intricate physiological process occurring in plants. Photosynthetic mechanisms include photosynthetic pigments, different types of which are present in varying abundances in photosynthetic systems [ 31 , 32 , 33 ]. In the present study, osanc092 plants showed a higher chlorophyll content after drought treatment ( Figure 3 ), which might be partly responsible for the observed higher Pn under drought conditions in the mutant lines.…”

Vibrational Spectroscopy as a Tool for Bioanalytical and Biomonitoring Studies

“…Based on the ν 1 /ν 2 , ν 1 /ν 3 , and ν 2 /ν 3 peak ratios as well as on other methods, it was shown that pH changes in algal cells did not cause changes in the content of chlorophyll a and b [ 48 ], whereas the content and conformation of carotenoids seemed to be changed. Studies intended to evaluate the effect of a thiamethoxam insecticide on maize leaves showed this compound caused changes in the photosynthetic activity of plants [ 50 , 51 ]. Based on the analysis of ν 1 /ν 2 , ν 1 /ν 3 , and ν 4 /ν 3 ratios, authors concluded this effect is accompanied by changes in the conformation of carotenoids but not in their content.…”

ИСПОЛЬЗОВАНИЕ ИНФРАКРАСНОЙ СПЕКТРОСКОПИИ И СПЕКТРОСКОПИИ КОМБИНАЦИОННОГО РАССЕЯНИЯ ДЛЯ АНАЛИЗА СОСТОЯНИЯ БИОМОЛЕКУЛ У ЛИНИЙ КУКУРУЗЫ Zea mays L.

“…По мнению авторов, совместное использование ИК-и КР-спектроскопии фракции хлоропластов листа можно рекомендовать в качестве малоинвазивного для растения метода контроля за содержанием и возможными различиями в конформации биологических молекул при тестировании линий и гибридов кукурузы (28)(29)(30).…”