Stability and adaptability of transgenics and no transgenics soybean cultivars in Chapadões region

Abstract

The work purpose was to verify stability and adaptability of transgenic and no transgenic soybean cultivars in Chapadões region at different production environments, considering locals and sowing seasons. Experiments were installed in Chapadão do Sul-MS, Água Clara-MS and Chapadão do Céu-GO, in 2006/07 crop. Were evaluated 20 soybean cultivars, been 0 transgenic (RR) and 0 no transgenic. The production environments were locals and sowing season combinations, been four seasons at Chapadão do Sul, (0/6/06, 0/27/06, /7/06 and /30/06), two at Água Clara (/07/06 and /28/06) and two at Chapadão do Céu (0/27/06 and /23/06). Stability and adaptability analysis were performed by bi-segmented linear regression, proposed by Cruz et al. (989). The results indicated that locals and sowing season influenced strongly grain yield. No transgenic cultivars were more productive at favorable and unfavorable environments average, presenting performance greater than productivity average (3,700.99 kg/ha), when compared to transgenic cultivars, except TMG 5 (RR) and TMG 2 (RR). Transgenic cultivars tend to be more sensitive to environment changes than no transgenic, nevertheless didn’t happen for stability. Early sowing seasons present the best environments index, been indicated for high grain yield. In whole of stability and adaptability parameters, cultivar TG 5 (RR) was the best, been indicated as much for favorable as unfavorable environments. Following classify themselves Msoy 800 and Chapadões cultivars.