Chinese Fir Improved Varieties Breeding of Qianshan Hybird Seed Orchard Seeds
Qianshan Hybird Seed Orchard Seeds are the third-generation excellent breeds of Chinese fir(Cunning-hamia lanceolata)produced by the bi-clonal and poly-clonal seed orchards in the Guizhou National Chinese Fir Breeding Improved Variety Base.The excellent combinations of parents are selected to fully utilize the special mating and the optimal fruiting characteristics after second-generation breeding.The high and stable yields have been a-chieved in the seed orchards.In this study,a dual-series seed orchard was constructed to graft the shoots from four parents,according to the correlation and fixed arrangement of breeding combination in the mating parents.A multi-series seed orchard was constructed by grafting shoots from 11 parents.A series of investigations were carried out to verify the flowering and fruiting characteristics of the introduced asexual lines.The seed yield of bi-clonal and poly-clonal seed orchards during full bearing period was 3.9 to 6.3 times that of the conventional.The rate of 5 to 6-year-old free-pollinated fresh strobilus to dry seed was about 4.0%,and the seed germination rate was as high as 49%.The bi-clonal and poly-clonal seed orchards were used to only produce the excellent seeds without breeding.The free-pollination progenies failed to be chosen.These progeny plus-trees were excluded from the next generation breeding population.The free-pollination progenies test was further validated to realize the optimal gains of seeds.The finding can provide a scientific basis for the thinning and registration of improved varieties breeding.
Chinese fir(Cunninghamia lanceolata)bi-clonal seed orchardpoly-clonal seed orchardimproved va-rieties breeding
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NSTL
万方数据
维普
