Inheritance of thermo-photoperiod sensitive male sterility in wheat

Abstract

The fertility of a wheat male sterile line 337S was investigated in 4 consecutive years with 18 different sowing dates. Line 337S showed high sterility under both short daylength/low temperature and long daylength/high temperature during ear development. It has 2 time windows to be used as a male sterile line for hybrid seed production. Its fertility rate can be >50% with suitable sowing time; thus, it can be self-maintained as a male sterile line. Line 337S was reciprocally crossed with 7 common wheat varieties and the fertility of their F1, F2, and BC1 hybrids was investigated at different sowing dates. The results showed that recessive nuclear genes controlled male sterility in 337S and no cytoplasmic effect was observed. All common wheat varieties were able to restore its fertility. The male sterility was controlled by a pair of recessive genes under short daylength/low temperature, but was governed by 2 pairs of recessive genes under long daylength/high temperature. This novel male sterile line provides a new tool for using heterosis in wheat.

Relationship of genetic distance and hybrid performance in hybrids derived from a new photoperiod-thermo sensitive male sterile wheat line 337S

“…The studies showed differential gene expression between hybrids and their parents might be responsible for heterosis (Ni et al 2000;Yao et al 2005). Guo et al (2006a) also indicated that differential allele regulation may play an important role in heterosis of 337S. Therefore, it is difficult to accurately predict heterosis based on GD, molecular understanding of the mechanisms of heterosis should be considered.…”

“…This provides two windows for it to be used as a male sterile line for hybrid seed production. The male sterility was controlled by recessive genes and no cytoplasmic effect was observed (Guo et al 2006a). Common wheat varieties carry fertility restoring genes for this male sterile line, which facilitates the selection of heterotic combinations.…”

“…Thus, there are two sowing timing for this line to be used as a male sterile line. Under appropriate sowing time, it becomes fertile with the self-fertility rate [ 50%, thus it can also be used as a maintainer line (Guo et al 2006a). The objectives of our study were to: (1) estimate GD between 337S and 16 cultivars using SSR markers, (2) analyze the relationships between GD and heterosis among the 16 crosses, (3) predict heteroic groups.…”

Inheritance and chromosome location of photoperiod‐thermo sensitive male sterility in wheat line Xinong 291S

“…In addition, Guo et al. () reported that the male sterility of 337S was controlled by a pair of recessive genes under short day‐length/low‐temperature conditions, but governed by two recessive genes under long day‐length/high‐temperature conditions.…”

“…Previous studies indicated that PTSMS in different wheat sources can be classified into three types: male sterility controlled by a recessive major gene and minor genes (Zhao et al 2001, Xing et al 2003, two recessive major genes and minor genes (Zhang et al 2007, Li et al 2009b, Wang 2011) and multiple genes (Yang et al 2000). In addition, Guo et al (2006a) reported that the male sterility of 337S was controlled by a pair of recessive genes under short day-length/low-temperature conditions, but governed by two recessive genes under long day-length/high-temperature conditions. Sears (1954Sears ( , 1966 developed a large array of aneuploid stocks including monosomics, nullisomics and nulli-tetrasomics in wheat cultivar 'Chinese Spring' (CS).…”