GENETIC STUDIES ON SOWING-TO-HEADING AND HEADING-TO-RIPENING PERIODS IN BARLEY AND THEIR RELATION TO YIELD AND YIELD COMPONENTS

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Abstract
The inheritance of life-cycle periods was studied in the F2 of 10-parent (2-rowed and 6-rowed varieties) and 6-parent (6-rowed varieties) diallel crosses. Both crosses were analysed by Hayman''s method, with the 6-parent cross being re-analyzed by a more-discriminating single-array technique. An analysis of 6-rowed recurrent x (set of 2-rowed + self) arrays was also made on a single array basis. It was found that short sowing-to-heading period was dominant over long, and that long heading-to-ripening period was dominant over short. In a given parent a long 1st (sowing to heading) period was associated with a short 2nd period, and vice versa. These relations were broken, but very rarely, in the progenies. Long 1st period was positively associated with high yield and high number of kernels per spike. In spite of these relations, it was possible to show that each character was controlled by different genes. Rare breakdown of parental character associations among the progeny provided good evidence for close linkage.

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