Growth Analysis of Glyphosate-Resistant and Susceptible Biotypes.

This study examined the growth parameters of both glyphosate-susceptible and glyphosate-resistant biotypes of , designated as GA2005 and GA2017, respectively. A two-year microplot field study was conducted to assess their growth characteristics. Scheduled destructive harvests on named harvest days (HD) were conducted to collect measurements for further calculation of net assimilation rate (NAR; g m day), specific leaf area (SLA), leaf weight ratio (LWR), stem-to-leaf ratio (SLR), leaf area index (LAI), leaf area ratio (LAR; cm g), leaf area duration (LAD; days), relative growth rate (RGR; g.

Early growth, development and allometry of glyphosate-resistant and susceptible Amaranthus palmeri in response to current and elevated temperature and CO.

This study aimed to evaluate the influence of CO and temperature on glyphosate-resistant and susceptible biotypes of Amaranthus palmeri (Palmer amaranth) in terms of morphological development. Height (cm), stem diameter (cm), leaf area (cm), number of leaves, leaf, stem, and root dry matter, plant volume (m), as well as shoot-to-root allometry were evaluated. The Palmer amaranth biotypes were grown under four different scenarios: 1-low temperature (23/33 °C) and CO (410 ± 25 ppm); 2-low temperature (23/33 °C) and high CO (750 ± 25 ppm); 3-high temperature (26/36 °C) and low CO (410 ± 25 ppm); and 4-high temperature (26/36 °C) and CO (750 ± 25 ppm).

Effect of subdoses of sugarcane ripeners on lettuce physiology in a drift scenario.

In order to understand the physiological effects of ripeners in sensitive crops, the objective of this work was to evaluate the effect of subdoses of the ripeners glyphosate, trinexapac-ethyl and sulfometuron methyl commonly used in sugarcane, in the growth of lettuce cultivar 'Lucy Brown' and 'Vanda'. To address the effects of the products in the lettuce physiology, analyses of fresh weight, dry weight, number of leaves, chlorophyll content, quantum efficiency of photosystem II, lipid peroxidation (MDA), hydrogen peroxide (HO), glutathione reductase (GR), guaiacol peroxidase (GPOX) were performed. We observed that among the products tested, glyphosate had minor impact on plant growth, compared to trinexapac-ethyl and sulfometuron methyl.