In the experiments the frost resistance of eight T. durum wheat varieties of various origins and of sixteen T. durum genotypes bred in Martonvásár was evaluated in the phytotron after freezing at -13°C and -15°C. In order to determine the degree of frost resistance the number of plants surviving freezing was recorded and each plant was scored on a 0-5 scale. For some of the T. durum genotypes tested in the freezing experiment the grain yield was also determined in field experiments. The bread wheat variety Mv 15, which has excellent frost resistance and was used as the control, exhibited approx. 94% survival at both freezing temperatures. When frozen at -15°C the varieties Odmadur 1, Odmadur 2 and Martondur 1 and many of the T. durum lines bred in Martonvásár showed survival rates approaching that of Mv 15. None of the T. durum genotypes tested was found to have frost resistance worse than that of the poorly resistant bread wheat variety NS Rana 2 at either freezing temperature. The grand mean of the survival percentages after freezing for all the genotypes tested was 80.96% at -13°C and 54.45% at -15°C, while the grand mean of the individual plant scores was 2.53 at -13°C and 1.58 at -15°C. It can thus be seen that freezing at the lower temperature led to an increase not only in the killed plant rate, but also in the number of surviving, but severely damaged plants. The degree of correlation between the grain yield and the scores obtained after freezing at both temperatures was determined for genotype pairs where was a significant difference in the scores, but not in the survival percentages. A close positive significant correlation (r=0.871) was found between the scores and the grain yields of the genotype pairs tested. In general genotypes with better scores gave higher grain yields, i.e. among the genotypes with similar killed plant rates, those which suffered a greater extent of individual plant damage during freezing also had lower productivity than the more resistant types.
|Translated title of the contribution||Frost resistance testing on Triticum durum (Desf.) genotypes in the Martonvásár phytotron|
|Number of pages||8|
|Publication status||Published - Apr 1 1998|
ASJC Scopus subject areas
- Agronomy and Crop Science