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Germinação de sementes de populações de orelha-de-mula (alisma plantago-aquatica) resistentes e susceptiveis ao bensulfurão-metilo
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Orientador(es)
Resumo(s)
Seed germination of bensulfuron-methyl
resistant (R) and susceptible (S) Alisma
plantagoaquatica biotypes collected in rice
fields from Baixo Mondego (6 samples);
Sorraia river valey (2 samples) and Sado river
valey (2 samples) were compared at 15 ºC and
15/30 ºC. All seed samples were two years old
and an extra sample three years old was also
included to assess the effect of seed age on
germination. Three year seeds reached higher
germination rates than two year seeds at both
temperature conditions. Cumulative germination
characterized for each biotype using non
linear regression (SSlogis) was different
according to geographic origin, resistance trait
and seed age. The model could not fit data from
Sado S biotype and two Baixo Mondego R
biotypes due to immature seed. Samples with
the highest cumulative germination also have
the highest germination rate. Seed germination
of S populations was similar at both temperature
conditions, whilst for R populations seed
germination was favoured by different
temperature depending on geographic origin:
temperature of 15/30 ºC gave the best results
for Mondego river valley (Centre region) and
temperature of 15 ºC for Sorraia and Sado river
valleys (Centre-South region of Portugal). The
resistant trait affects germination of A.
plantago-aquatica seeds and may affect
resistant-weed management strategies implemented
early in the growing season when temperatures are lower
Descrição
Palavras-chave
alisma plantago-aquatica germination herbicide resistance bensulfuronmethyl resistência aos herbicidas bensulfurão-metilo
Contexto Educativo
Citação
"Revista de Ciências Agrárias". ISSN 0871-018X. 31:1 (2008) 117-130
Editora
Sociedade de Ciências Agrárias de Portugal