Physiological and sanitary quality of ryegrass seeds submitted to different defoliation frequencies
ABSTRACT: This study determined the effect of different defoliation frequencies in a long-cycle ryegrass cultivar on yield components and the physiological and sanitary quality of seeds. Four defoliation frequencies were applied (without, one, two, and three defoliations). The time between defoliati...
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| Format: | Article |
| Language: | English |
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Universidade Federal de Santa Maria
2021-11-01
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| Series: | Ciência Rural |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782022000600152&tlng=en |
| _version_ | 1818730995607666688 |
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| author | Ricardo Pereira da Cunha Joice Fernanda Lübke Bonow Andréa Mittelmann Manoel de Souza Maia Alberto Bohn Roberto Caetano de Oliveira Jéssica Dias Gomes da Silva Carlos Eduardo da Silva Pedroso |
| author_facet | Ricardo Pereira da Cunha Joice Fernanda Lübke Bonow Andréa Mittelmann Manoel de Souza Maia Alberto Bohn Roberto Caetano de Oliveira Jéssica Dias Gomes da Silva Carlos Eduardo da Silva Pedroso |
| author_sort | Ricardo Pereira da Cunha |
| collection | DOAJ |
| description | ABSTRACT: This study determined the effect of different defoliation frequencies in a long-cycle ryegrass cultivar on yield components and the physiological and sanitary quality of seeds. Four defoliation frequencies were applied (without, one, two, and three defoliations). The time between defoliations was 350 degree-days. At the first, second, and third defoliation time, the plants were 15 cm, 20 cm, and 35 cm, respectively, and were lowered to half their height. The yield components and plant structure were evaluated through the tillers, along with the physiological quality of the seeds, which was verified by germination tests, first germination count, accelerated aging, tetrazolium test, field emergence, and weight of a thousand seeds. For the sanitary quality analysis, the percentage (%) of fungi incidence in the seeds was verified. The second defoliation determined the seeds’ high physiological and sanitary quality due to the higher amount of primary and secondary tillers produced concerning the other treatments. However, there was no significant difference for the third defoliation since the aerial tillers issued the same quality of seeds originated from primary and secondary tillers. The average incidence of fungi such as Colletotrichum sp., Fusarium sp., Phoma sp., and Dreshslera spp. was lower in ryegrass plants subjected to three defoliations. |
| first_indexed | 2024-12-17T23:10:38Z |
| format | Article |
| id | doaj.art-b87e365552b74d748be896df097daa25 |
| institution | Directory Open Access Journal |
| issn | 1678-4596 |
| language | English |
| last_indexed | 2024-12-17T23:10:38Z |
| publishDate | 2021-11-01 |
| publisher | Universidade Federal de Santa Maria |
| record_format | Article |
| series | Ciência Rural |
| spelling | doaj.art-b87e365552b74d748be896df097daa252022-12-21T21:29:08ZengUniversidade Federal de Santa MariaCiência Rural1678-45962021-11-0152610.1590/0103-8478cr20200719Physiological and sanitary quality of ryegrass seeds submitted to different defoliation frequenciesRicardo Pereira da Cunhahttps://orcid.org/0000-0002-2728-2488Joice Fernanda Lübke Bonowhttps://orcid.org/0000-0002-0419-2594Andréa Mittelmannhttps://orcid.org/0000-0003-1845-4273Manoel de Souza MaiaAlberto Bohnhttps://orcid.org/0000-0001-6406-6816Roberto Caetano de Oliveirahttps://orcid.org/0000-0002-9916-4464Jéssica Dias Gomes da Silvahttps://orcid.org/0000-0001-6224-4025Carlos Eduardo da Silva Pedrosohttps://orcid.org/0000-0003-3253-6152ABSTRACT: This study determined the effect of different defoliation frequencies in a long-cycle ryegrass cultivar on yield components and the physiological and sanitary quality of seeds. Four defoliation frequencies were applied (without, one, two, and three defoliations). The time between defoliations was 350 degree-days. At the first, second, and third defoliation time, the plants were 15 cm, 20 cm, and 35 cm, respectively, and were lowered to half their height. The yield components and plant structure were evaluated through the tillers, along with the physiological quality of the seeds, which was verified by germination tests, first germination count, accelerated aging, tetrazolium test, field emergence, and weight of a thousand seeds. For the sanitary quality analysis, the percentage (%) of fungi incidence in the seeds was verified. The second defoliation determined the seeds’ high physiological and sanitary quality due to the higher amount of primary and secondary tillers produced concerning the other treatments. However, there was no significant difference for the third defoliation since the aerial tillers issued the same quality of seeds originated from primary and secondary tillers. The average incidence of fungi such as Colletotrichum sp., Fusarium sp., Phoma sp., and Dreshslera spp. was lower in ryegrass plants subjected to three defoliations.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782022000600152&tlng=engerminationfungiLolium multiflorumaerial tillers |
| spellingShingle | Ricardo Pereira da Cunha Joice Fernanda Lübke Bonow Andréa Mittelmann Manoel de Souza Maia Alberto Bohn Roberto Caetano de Oliveira Jéssica Dias Gomes da Silva Carlos Eduardo da Silva Pedroso Physiological and sanitary quality of ryegrass seeds submitted to different defoliation frequencies Ciência Rural germination fungi Lolium multiflorum aerial tillers |
| title | Physiological and sanitary quality of ryegrass seeds submitted to different defoliation frequencies |
| title_full | Physiological and sanitary quality of ryegrass seeds submitted to different defoliation frequencies |
| title_fullStr | Physiological and sanitary quality of ryegrass seeds submitted to different defoliation frequencies |
| title_full_unstemmed | Physiological and sanitary quality of ryegrass seeds submitted to different defoliation frequencies |
| title_short | Physiological and sanitary quality of ryegrass seeds submitted to different defoliation frequencies |
| title_sort | physiological and sanitary quality of ryegrass seeds submitted to different defoliation frequencies |
| topic | germination fungi Lolium multiflorum aerial tillers |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782022000600152&tlng=en |
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