| The average values of four characters taken as indications of competitive
ability were compared on the basis of three replications in pure stands
and as many from mxied stands. As shown in Table 2,
almost all of the values of five resynthesized wheat strains in pure stands
are high comparing to those in mixed stands. Therefore, it is clear that
the competitive abilities of five resynthesized strains tested are generally
lower than that of Chinese Spring. Results of analyses of variance of the
above mentioned data are presented in Table 3.
Competitive effects were observed in three characters, i.e. weight of whole
plant (including root weight), weight of ears, number of ears in comparison
with those of pure stand. The differences in decrements between the strains
were not so striking, but it will be found commonly as a general tendency
that competitive ability of Canthatch is greater than resynthesized hexaploid
wheats. Among the resynthesized hexaploid wheats, the lowest competitive
ability was observed in ABD 5003. These results indicated that DD genome of Canthatch contributed to the adaptability of its strain more than DD genome of Aegilops squarrosa. The reproductive abilities of the strain such as grain yields must affect the survival rate, even though total grain yields produced by certain tested strains was not modified significantly according to their competitive abilities, but in ABD 5003. Competitive effects would rather be observed in vegetative characters such as weight of whole plant. Because competitive effects in total grain yield in four resynthesized hexaploid wheat strains were not observed, but in vegetative character (weight of whole plant), more allocation of photosynthate into reproductive character will represent in resynthesized wheat than in common wheat in competitive condition. Literature Cited KERBER, E.R. 1964. Wheat: reconstitution of the tetraploid component (AABB) of hexaploids. Science 143: 253-255. |
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