Absorption and translocation of imazethapyr as a mechanism responsible for resistance of Euphorbia heterophylla L. biotypes to acetolactate synthase (ALS) inhibitors
<p class="MsoNormal" style="margin-bottom: .0001pt; text-align: justify; line-height: normal;"><span style="font-size: 10.0pt; font-family: ";Cambria";,";serif";; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; m...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Centro Editorial of Facultad de Ciencias Agrarias, Universidad Nacional de Colombia
2006-12-01
|
| Series: | Agronomía Colombiana |
| Online Access: | http://www.revistas.unal.edu.co/index.php/agrocol/article/view/20043 |
| _version_ | 1828789987040034816 |
|---|---|
| author | Plaza Guido A. Osuna María Dolores De Prado Rafael Heredia Antonio |
| author_facet | Plaza Guido A. Osuna María Dolores De Prado Rafael Heredia Antonio |
| author_sort | Plaza Guido A. |
| collection | DOAJ |
| description | <p class="MsoNormal" style="margin-bottom: .0001pt; text-align: justify; line-height: normal;"><span style="font-size: 10.0pt; font-family: ";Cambria";,";serif";; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-ansi-language: EN-US;" lang="EN-US">The effect of weeds on reduction of agricultural production is estimated between 30% and 50%. Imazethapyr is a herbicide of imidazolinone group that inhibits activity of enzyme acetolactate synthase (ALS), the first common enzyme in the biosynthetic pathway of valine, leucine, and isoleucine. Euphorbia heterophylla is common specie in soybean fields of Brazil. The study reports about a population of Euphorbia heterophylla resistant to imazethapyr. The objectives of the present work were to quantify the level of sensitivity to this herbicide in imazethapyr-resistant and -susceptible E.<span style="mso-spacerun: yes;"> </span>heterophylla populations evaluate the role of differential penetration into leaves as determining plant resistance to imazethapyr, and compare the waxy cells of R and S populations. The R population had a lower penetration rate compared with that of S population during the six first hours of incubation with the herbicide. Further studies indicated that R population was not different from S population in terms of translocation, metabolism, or target site (ALS enzyme) of imazethapyr action. Analysis of the leaf cuticle surface by scanning electron microscopy revealed higher wax density in the leaf cuticles of population R than that in S population. Thus, it is suggested that R population is resistant<span style="mso-spacerun: yes;"> </span>to imazethapyr because increased wax content of its cuticle permits less penetration of herbicide into the plant.</span></p> |
| first_indexed | 2024-12-12T01:22:25Z |
| format | Article |
| id | doaj.art-de991ff147694c1b9028bf99c226f624 |
| institution | Directory Open Access Journal |
| issn | 0120-9965 |
| language | English |
| last_indexed | 2024-12-12T01:22:25Z |
| publishDate | 2006-12-01 |
| publisher | Centro Editorial of Facultad de Ciencias Agrarias, Universidad Nacional de Colombia |
| record_format | Article |
| series | Agronomía Colombiana |
| spelling | doaj.art-de991ff147694c1b9028bf99c226f6242022-12-22T00:43:12ZengCentro Editorial of Facultad de Ciencias Agrarias, Universidad Nacional de ColombiaAgronomía Colombiana0120-99652006-12-01242302305Absorption and translocation of imazethapyr as a mechanism responsible for resistance of Euphorbia heterophylla L. biotypes to acetolactate synthase (ALS) inhibitorsPlaza Guido A.Osuna María DoloresDe Prado RafaelHeredia Antonio<p class="MsoNormal" style="margin-bottom: .0001pt; text-align: justify; line-height: normal;"><span style="font-size: 10.0pt; font-family: ";Cambria";,";serif";; mso-ascii-theme-font: major-latin; mso-hansi-theme-font: major-latin; mso-ansi-language: EN-US;" lang="EN-US">The effect of weeds on reduction of agricultural production is estimated between 30% and 50%. Imazethapyr is a herbicide of imidazolinone group that inhibits activity of enzyme acetolactate synthase (ALS), the first common enzyme in the biosynthetic pathway of valine, leucine, and isoleucine. Euphorbia heterophylla is common specie in soybean fields of Brazil. The study reports about a population of Euphorbia heterophylla resistant to imazethapyr. The objectives of the present work were to quantify the level of sensitivity to this herbicide in imazethapyr-resistant and -susceptible E.<span style="mso-spacerun: yes;"> </span>heterophylla populations evaluate the role of differential penetration into leaves as determining plant resistance to imazethapyr, and compare the waxy cells of R and S populations. The R population had a lower penetration rate compared with that of S population during the six first hours of incubation with the herbicide. Further studies indicated that R population was not different from S population in terms of translocation, metabolism, or target site (ALS enzyme) of imazethapyr action. Analysis of the leaf cuticle surface by scanning electron microscopy revealed higher wax density in the leaf cuticles of population R than that in S population. Thus, it is suggested that R population is resistant<span style="mso-spacerun: yes;"> </span>to imazethapyr because increased wax content of its cuticle permits less penetration of herbicide into the plant.</span></p>http://www.revistas.unal.edu.co/index.php/agrocol/article/view/20043 |
| spellingShingle | Plaza Guido A. Osuna María Dolores De Prado Rafael Heredia Antonio Absorption and translocation of imazethapyr as a mechanism responsible for resistance of Euphorbia heterophylla L. biotypes to acetolactate synthase (ALS) inhibitors Agronomía Colombiana |
| title | Absorption and translocation of imazethapyr as a mechanism responsible for resistance of Euphorbia heterophylla L. biotypes to acetolactate synthase (ALS) inhibitors |
| title_full | Absorption and translocation of imazethapyr as a mechanism responsible for resistance of Euphorbia heterophylla L. biotypes to acetolactate synthase (ALS) inhibitors |
| title_fullStr | Absorption and translocation of imazethapyr as a mechanism responsible for resistance of Euphorbia heterophylla L. biotypes to acetolactate synthase (ALS) inhibitors |
| title_full_unstemmed | Absorption and translocation of imazethapyr as a mechanism responsible for resistance of Euphorbia heterophylla L. biotypes to acetolactate synthase (ALS) inhibitors |
| title_short | Absorption and translocation of imazethapyr as a mechanism responsible for resistance of Euphorbia heterophylla L. biotypes to acetolactate synthase (ALS) inhibitors |
| title_sort | absorption and translocation of imazethapyr as a mechanism responsible for resistance of euphorbia heterophylla l biotypes to acetolactate synthase als inhibitors |
| url | http://www.revistas.unal.edu.co/index.php/agrocol/article/view/20043 |
| work_keys_str_mv | AT plazaguidoa absorptionandtranslocationofimazethapyrasamechanismresponsibleforresistanceofeuphorbiaheterophyllalbiotypestoacetolactatesynthasealsinhibitors AT osunamariadolores absorptionandtranslocationofimazethapyrasamechanismresponsibleforresistanceofeuphorbiaheterophyllalbiotypestoacetolactatesynthasealsinhibitors AT depradorafael absorptionandtranslocationofimazethapyrasamechanismresponsibleforresistanceofeuphorbiaheterophyllalbiotypestoacetolactatesynthasealsinhibitors AT herediaantonio absorptionandtranslocationofimazethapyrasamechanismresponsibleforresistanceofeuphorbiaheterophyllalbiotypestoacetolactatesynthasealsinhibitors |