Stability and Variability of Male Infertility of Wheat BNS Line

BNS is a type of thermo-sensitive wheat male-sterile line.Years of observation had made sure that the sterile line could express stable sterility and convertibility.But in 2012,we observed in seven sowing dates that BNS' fertile-pollen rate and self-seeds rate increased 0.46%-19.94% and 2.74%-34.59%,respectively,comparing with that of in 2008 and 2009,and the difference between them were significant.It was also found from correlation analysis between the sliding accumulated temperatures of per 4 days of 32 days before anthesis and fertile-pollen rate and self-seeds rate that the BNS fertility conversion on the temperature could be affected significant in most days of anther differentiation and pollen development,including until four days before anthesis.The meteorological data investigation to near 5 years showed that the year of 2012 was a relative higher temperature one in the area.The lowest temperature in April of 2012 was higher than that of past five years.It was the higher temperature that resulted in BNS' infertility reduce and self-seeds rate increase in 2012.These results suggested that,for the security usage,the advisement of BNS infertile sowing date must take into account to special temperature climate to happen in the area of BNS planting.