Avaliação dos efeitos de doses de triadimenol e de tebuconazole sobre o crescimento do mesocótilo em plântulas de trigo

• Autor(a) principal: Cavariani, Cláudio [UNESP]
• Data de Publicação: 1994
• Outros Autores: Velini, Edivaldo Domingues [UNESP], Bicudo, Silvio José [UNESP], Nakagawa, J.
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://seer.sct.embrapa.br/index.php/pab/article/view/4145; http://hdl.handle.net/11449/32956
• topic: TRITICUM-AESTIVUM; CULTIVAR; SEEDS; ROOTS

Wheat (Triticum aestivum L.), Anahuac cultivar, were treated with six triadimenol (0,0; 12,5; 25,0; 37,5; 50,0 and 62,5 g of a.i./100 kg of seeds) and tebuconazole (0,0; 7,5; 15,0; 22,5 30,0 and 37,5 g of a.i./100 kg of seeds) dosis to reduce the subcrown internode length and then to deep the point of emission of adventitious roots. Seeds were seeded in pots with soil, with 5 cm of depth and after two weeks the seedlings number was counted and the subcrown internode length (CM) was evaluated. The CM may be represented by the equations: a) CM = 4,49 - 0,1779 x + 0,002161 x2 (r2 = 0,9247); b) CM = 4,62 - 0,29948 y + 0,006480 y3 - 0,00004622 y3 (r2 = 0,9551), where ''x'' and ''y'' represent tebuconazole and triadimenol dosis, respectively. The CM showed minimum values for triadimenol dosis equal to or higher than 37,5 g a.i./100 kg of seeds and for tebuconazole decreased continuously with the increase of the product dosis, showing values near to 1 cm for the maximum dosis. The triadimenol allowed, at suitable dosis, almost total inhibition of the wheat seedlings subcrown internode with no effects on seedling emergence and initial growth.