Sunflower response to repeated foliar applications of Paclobutrazol
Paclobutrazol (PBZ), a well-known growth retardant of the triazole family, is mostly used for controlling plant size and growth, resulting in more desirable compact plants for floricultural purposes; however, limited experimental data are available for use of PBZ in field sunflower. The objective of...
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira da Ciência das Plantas Daninhas
2015-03-01
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| Series: | Planta Daninha |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582015000100129&tlng=en |
| _version_ | 1818938000959078400 |
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| author | S.D. KOUTROUBAS C.A. DAMALAS |
| author_facet | S.D. KOUTROUBAS C.A. DAMALAS |
| author_sort | S.D. KOUTROUBAS |
| collection | DOAJ |
| description | Paclobutrazol (PBZ), a well-known growth retardant of the triazole family, is mostly used for controlling plant size and growth, resulting in more desirable compact plants for floricultural purposes; however, limited experimental data are available for use of PBZ in field sunflower. The objective of this study was to evaluate the effect of repeated foliar applications of PBZ at rates of 50 + 50 g ha-1(double application) and 50 + 50 + 50 g ha-1 (triple application) on sunflower morphology and productivity. PBZ applications corresponded to growth stages of four to five, five to six, and six to eight true leaves of sunflower plants, respectively. The double foliar application of PBZ reduced sunflower plant height at maturity by 4.4% (or by 11.7 cm). The triple foliar application of PBZ reduced sunflower plant height at maturity by 14.4% (or by 49.2 cm). However, PBZ either in the double or the triple application reduced achene yield per plant by 25.6% and 22.5% and the 100-achene weight by 11.4% and 25.0%, respectively, compared with the non-treated control. Overall, the repeated foliar applications of PBZ at the rates tested in this study, apart from providing a reduction of sunflower plant height, had major adverse effects on achene yield and weight. Thus, different application schemes of PBZ or perhaps different growth regulators should be investigated to control plant height in sunflower. |
| first_indexed | 2024-12-20T06:00:54Z |
| format | Article |
| id | doaj.art-e422d9d33f5549d09aef60013fc48217 |
| institution | Directory Open Access Journal |
| issn | 0100-8358 |
| language | English |
| last_indexed | 2024-12-20T06:00:54Z |
| publishDate | 2015-03-01 |
| publisher | Sociedade Brasileira da Ciência das Plantas Daninhas |
| record_format | Article |
| series | Planta Daninha |
| spelling | doaj.art-e422d9d33f5549d09aef60013fc482172022-12-21T19:50:55ZengSociedade Brasileira da Ciência das Plantas DaninhasPlanta Daninha0100-83582015-03-0133112913510.1590/S0100-83582015000100015Sunflower response to repeated foliar applications of PaclobutrazolS.D. KOUTROUBASC.A. DAMALASPaclobutrazol (PBZ), a well-known growth retardant of the triazole family, is mostly used for controlling plant size and growth, resulting in more desirable compact plants for floricultural purposes; however, limited experimental data are available for use of PBZ in field sunflower. The objective of this study was to evaluate the effect of repeated foliar applications of PBZ at rates of 50 + 50 g ha-1(double application) and 50 + 50 + 50 g ha-1 (triple application) on sunflower morphology and productivity. PBZ applications corresponded to growth stages of four to five, five to six, and six to eight true leaves of sunflower plants, respectively. The double foliar application of PBZ reduced sunflower plant height at maturity by 4.4% (or by 11.7 cm). The triple foliar application of PBZ reduced sunflower plant height at maturity by 14.4% (or by 49.2 cm). However, PBZ either in the double or the triple application reduced achene yield per plant by 25.6% and 22.5% and the 100-achene weight by 11.4% and 25.0%, respectively, compared with the non-treated control. Overall, the repeated foliar applications of PBZ at the rates tested in this study, apart from providing a reduction of sunflower plant height, had major adverse effects on achene yield and weight. Thus, different application schemes of PBZ or perhaps different growth regulators should be investigated to control plant height in sunflower.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582015000100129&tlng=enAchene yieldgrowth retardantsheightlodging |
| spellingShingle | S.D. KOUTROUBAS C.A. DAMALAS Sunflower response to repeated foliar applications of Paclobutrazol Planta Daninha Achene yield growth retardants height lodging |
| title | Sunflower response to repeated foliar applications of Paclobutrazol |
| title_full | Sunflower response to repeated foliar applications of Paclobutrazol |
| title_fullStr | Sunflower response to repeated foliar applications of Paclobutrazol |
| title_full_unstemmed | Sunflower response to repeated foliar applications of Paclobutrazol |
| title_short | Sunflower response to repeated foliar applications of Paclobutrazol |
| title_sort | sunflower response to repeated foliar applications of paclobutrazol |
| topic | Achene yield growth retardants height lodging |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582015000100129&tlng=en |
| work_keys_str_mv | AT sdkoutroubas sunflowerresponsetorepeatedfoliarapplicationsofpaclobutrazol AT cadamalas sunflowerresponsetorepeatedfoliarapplicationsofpaclobutrazol |