Seeding density in wheat genotypes as a function of tillering potential

Abstract

Seeding density adjustments is one of the practices that most influence grain yield, as well as other agronomic traits. Therefore, the objective of this study was to determine the ideal plant stand to achieve the maximum grain yield in genotypes showing differential tillering ability. Also, to establish the associations between the genotypes used with tillering and other agronomically important traits as weight of a thousand grains. Two experiments were conducted in 2005 and 2006 in Capão do Leão, Rio Grande do Sul state, Brazil. Five low (JURITI, BR 18, CEP 29, BR 18 and CD 108) and five high (CD 114, SAFIRA, FIGUEIRA, BRS 177 and UMBU) tillering potential wheat cultivars were tested for two years on a split-plot design. The results indicate the need for recommending cultivars based on more than one year of cultivation, especially when dealing with contrasting genotypes for the trait fertile tillers. Regarding the ideal plant stand, seeding density of low tillering ability genotypes ranges from 417 to 555 seeds m -2 , in order to obtain maximum yield and grain weight. On the other hand, for high tillering ability genotypes, the ideal stand ranges from 221 to 422 seeds m -2. These results were year independent. Furthermore, low tillering ability genotypes showed a closer association of number of fertile tillers with grain yield. However, an inverse association was found between number of fertile tillers and weight of a thousand grains.

Effect of seeding rate on grain quality of winter wheat

“…They established that with seeding rate of 600 in compare to 480 seeds m -2 increased number of spikes m -2 , number of grains per spike, but 1000 grain weight and coefficient of productive tillering decreased. Valério et al (2009) established that low tillering ability genotypes showed a closer association of number of fertile tillers with grain yield. However, an inverse association was found between number of fertile tillers and weight of 1000-grains.…”

“…Numerous studies have documented how N fertilization (Campillo et al, 2010;Hirzel et al, 2010;Zecevic et al, 2010;Nikolic et al, 2012), seeding rate, planting date, row spacing, and seeding depth affect yield and yield components of wheat (Wajid et al, 2004;Guberac et al, 2005;Schillinger, 2005;Kristó et al, 2007;Maric et al, 2008;Otteson et al, 2008;Valério et al, 2009). Seeding rates for winter wheat can vary widely due to differences in seed quality, planting conditions, planting dates and planting equipment (Lloveras et al, 2004).…”

Tolerance to preharvest sprouting and yield of wheat genotypes from different breeding programs

“…Genetically distant genotypes with high performance per se are very promising to increase the genetic variability of superior recombinant genotypes (Bertan et al, 2009). The simultaneous analysis is an efficient tool to identify superior genotypes for the selection of high potential combinations for many traits.…”

Perfilhamento do trigo em função da aplicação de regulador vegetal

“…Médias seguidas da mesma letra na coluna não diferem entre si pelo teste F (p < 0,05) emitidos nos primeiros dias após a aplicação do produto, com efeito residual reduzido. O balanço entre auxinas e citocininas é determinante para emissão de perfilhos, tendo efeito direto sobre a definição dos componentes da produção de grãos (Valério et al, 2009a). Contudo, a alteração no balanço hormonal das plantas pela aplicação de Ax+GA+CK, exerceu pouco efeito sobre a emissão de perfilhos, principalmente no período em que a emissão de perfilhos é maior (Figura 1).…”

“…O desenvolvimento e a participação de perfilhos têm sido apontados como de extrema importância para a produção final de plantas de trigo (Alves et al, 2000;Alves et al, 2005, Valério et al, 2009a. A grande diversidade no padrão de perfilhamento dos genótipos de trigo determina que não exista uma relação direta entre número de perfilhos férteis e rendimento de grãos (Sparkes et al, 2006).…”