A half diallel set of crosses among six inbred lines of sweet corn was evaluated to study heterosis and combining ability among plant height, ear height, ear diameter, number of rows per ear and ear yield per plant. The study was carried out at the a
gricultural research center in, GCSAR, Lattakia, Snoubar Jableh, during the 2010, 2011 seasons.
Result showed that almost all crosses expressed a significant positive heterosis effect for ear yield per plant relative to mid parents and better parents; whereas, the highest positive significant percentage of heterosis for ear yield per plant were expressed by the crosses (L4xL6) which gave (198.70%, 176.81%) and (L4xL6) which gave (196.94%, 168.56%), over mid parents and better parents, respectively.
The ratio (σ2GCA/σ2SCA) which was less than (1) showed that the non-additive gene action was more important than the additive gene action in all traits except plant height and ear height. The inbred lines L3 (17.061) and L4 (12.011) seemed to be the best general combiners for ear yield. Also, based on SCA effects, many of single crosses were identified as superior for ear yield, and the best hybrid was L3xL5(50.173).
This research was carried out at the Maize Researches Department of
General Commission of Science Agriculture Research (GCSAR), Damascus,
Syria, During the growing season 2010 to study general and specific combining
ability and the behavior of the
inheritance of plant height, ear height, yield per
unit area, ear length and ear diameter in sweet corn by the use of half diallel
crosses of five selected sweet corn inbred lines (IL.1037-08) P1, (IL.1062-08) P2,
(IL.1049-08) P3, (IL.209-08) P4 and (IL.1065-08) P5
It is well understood that the productivity and thus the final yield of a crop
are the result of several interacted factors, which have different effects on yield.
This requires the determination of all factors affecting yield or other traits, the
relationships among these factors, the value of correlation coefficient and the
degree to which yield is affected by each of these factors.
The relations between genes and their phenotypic effects do not always
ensure the presence of a particular effect, the causes that modify the effect of
particular genes can be traced to the large gap between the genetic material
and the phenotype
of an organism.
Thus, development must also depend upon environmental factors of which
interaction may occur between the environment and the genetype. The
appearance of an organism does not always reflect its genetic constitution and
various environments may affect the same genotype differently.
The objective of the research is to identify the optimal date of
planting when mutual intercropping (line: line) is used in planting
beans Phaseolus vulgaris L. and sweet corn Zea mays rugose L.
