Prospects for improving the grain protein content of oats by intra- and interspecific hybridization
1984
Clamot, G. (Station d'amelioration des plantes, Gembloux (Belgium))
Field tests were carried out in 1981, 1982 and 1983 on a certain number of F5, F6, F7 and F8 lines derived from crosses between the high-protein genotypes SA 257, SA 503 (Avena sativa) and ST 8 (Avena sterilis) and the normal-protein varieties Anita, Leanda, Selma, Ondine, Gambo and H 229.7. A high negative correlation (-0.62 to -0.88 depending on the test) between grain yield and grain protein content was found. The grain protein yield is mainly determined by the grain yield, and there can even be a negative correlation between grain protein percentage and grain protein yield. A large part of the variability of grain protein content (38 % to 77 % depending on the test) was attributable to variations in grain yield. The average of the linear regression coefficients of grain protein content on grain yield showed that each variation in grain yield of 1000 kg per ha corresponded to an opposite variation in protein of 1 +- 0.2 percentage point. In order to make a valid comparison of the grain protein content of lines differing in grain yield, the protein values were adjusted to the mean yield of the check varieties used for each test. These adjusted values were used to predict the improvement in grain protein percentage which can be achieved without reducing yield compared to the best cultivars of oats presently available. This improvement should not be greater than 2 percentage points. The amount of protein per grain cannot be a valid selection criterion for oats. There is indeed a negative correlation between this trait and grain yield, and a nil or even negative correlation with the grain protein yield.
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