Relationships between Some Characters of Wheat Varieties and Strains

[摘要] Coefficient correlations were calculated between the some characters on space planted 36 winter wheat varieties and strains. 1. No correlation was found between the number of tillers and fresh weight, both of which represent the degree of vegetative growth. But this relation is different in the tiller on coleoptile, i.e. the weight and number of tillers are closely related. 2. There was close relation between the plastoclone and the number of tillers on main stalk. Plastoclone may express, in certain extent, the tillering ability of varieties. The difference of tillering ability between the varieties may be mainly due to the degree of growth of leaves governing the plastoclone. 3. However, nearly same degree of correlations between the number of tillers on main stalk and the length of leaf blade, leaf sheath and width of leaf were obtained. But the relation between length of the leaf blade and leaf sheath, and plastoclone, and those between width of the leaf, and recumbence and the number of imperfect spikelets were very high. 4. Associations between investigated characters of vegetative stage were, in general, high, and it was assumed that these characters might be related biochemically. 5. The number of imperfect spikelets, degree of recumbence, width of leaf and the number of tillers on main stalk had close relations between the main character of ripening stage. Besides, the greater part of these characters were correlate with the number of days to heading. 6. The number of tillers on main stalk has significant correlation with grain weight per plant, but non significant correlate was found between number of tillers on main stalk and number of spikes per plant. 7. Coefficient of correlation of the number of days to heading with the grain weight per plant was low. Further, the number of days to heading has no correlation with culm diameter, which correlated with number of grains of main stem, whereas it has high association with number of spikes, number of spikelets and the degree of spike emasculation from booting leaf sheath and others. 8. Thus, it was assumed that there are reproductive physiological associations among various agronomic characters through the growing period of wheat plant, excepted a few characters. 9. Correlation coefficient between the number of imperfect spikelets and the number of days to heading was-. 596, and it is very interesting that the number of imperfect spikelets counted before overwintering had close association with earliness. 10. According to the results of this study, the number of spikes has no relation with grain weight of main stem. Therefore, we are able to increase the yield by means of increase either number of ears or the gain yield per stem. 11. It is interesting that the culm diameter was correlated with number of grains of main stalk. Besides, the degree of spike emasculation from booting leaf sheath was correlated with grain weight of main spike.

[学科分类] 农业科学（综合）