Early growth, development and allometry of glyphosate-resistant and susceptible Amaranthus palmeri in response to current and elevated temperature and CO2-Reference-Cited by-同舟云学术

Early growth, development and allometry of glyphosate-resistant and susceptible Amaranthus palmeri in response to current and elevated temperature and CO2

Published:2023-05-12 Issue: Volume: Page:
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Author:

Rodrigues Juliana de Souza¹,Shilling Donn¹,Tishchenko Viktor¹,Bowen Samantha¹,Deng Shiyugan¹,Hall Daniel¹,Grey Timothy¹

Affiliation:

1. University of Georgia

Abstract

Abstract This study aimed to evaluate the main factor(s) influencing Amaranthus palmeri (Palmer amaranth) biotypes growth, development, and what parameters were affected. Seeds of two glyphosate resistant (GA2017 and GA2020) and one susceptible (GA2005) Palmer amaranth biotypes were collected in Georgia, US during those growing seasons. These seed were used to grow plants and then evaluate response to scenarios of normal and elevated CO2 (410± 25 ppm and 750± 25 ppm) and temperature (23/33o.C and 26/36o.C). CO2 was the main factor affecting Palmer amaranth growth and differences among biotypes were also observed. Plants grown under elevated CO2 showed increases in height (cm), leaf area (cm2), stem dry matter (g) and plant volume (m3) while among susceptible and resistant biotypes, GA2005 had greater number of leaves, height (cm) and plant volume (m3) compared to glyphosate-resistant biotypes. Shoot to root ratio of the biotypes was isomeric, despite the allometry observed at 14 and 28 days after transplant (DAT) with respect to shoot development. The data indicate that Palmer amaranth may perceive and adapt its above-ground development in response to changes in the surrounding environment. These findings have important implications for the management of this weed species under climate change scenarios, since it is estimated that CO2 levels and temperatures will continue to rise throughout the century.

Publisher

Research Square Platform LLC

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