摘要
Guar [Cyamopsis tetragonoloba （L.） Taub.] is one of the most important industrial crops due to its richness in gum. Understanding the inheritance of gum content is a key to its successful genetic improvement. Gum content expression is reported to be controlled by additive, dominant, and epistatic effects, and modified by the environment, fg%, a relative gum content calculated by comparing with the gum content of Kinman was used as gum content （%） in this experiment. Reciprocal crosses of two lines of guar, PI 217923 and Lewis, were made to study the heritability of gum content （fg%）. fg% of four plant introductions and four commercial varieties were studied in Lubbock in 1999-2002. Estimates of broadsense heritability （h^2 b,s.） of fg% in Lewis x PI 217923 and PI 217923 x Lewis were 75.53 and 52.74%, respectively. Estimates of narrow-sense heritability （h2 n.s.） of fg% were 40.00 and 29.00% thr Lewis x PI 217923 and PI 217923 x Lewis, respectively. At least one pair of genes were estimated to control the fg% expression in these two crosses, Significant differences of fg% were found among these eight entries. PI 217923 was found to have the highest fg% among the eight entries.
Guar [Cyamopsis tetragonoloba （L.） Taub.] is one of the most important industrial crops due to its richness in gum. Understanding the inheritance of gum content is a key to its successful genetic improvement. Gum content expression is reported to be controlled by additive, dominant, and epistatic effects, and modified by the environment, fg%, a relative gum content calculated by comparing with the gum content of Kinman was used as gum content （%） in this experiment. Reciprocal crosses of two lines of guar, PI 217923 and Lewis, were made to study the heritability of gum content （fg%）. fg% of four plant introductions and four commercial varieties were studied in Lubbock in 1999-2002. Estimates of broadsense heritability （h^2 b,s.） of fg% in Lewis x PI 217923 and PI 217923 x Lewis were 75.53 and 52.74%, respectively. Estimates of narrow-sense heritability （h2 n.s.） of fg% were 40.00 and 29.00% thr Lewis x PI 217923 and PI 217923 x Lewis, respectively. At least one pair of genes were estimated to control the fg% expression in these two crosses, Significant differences of fg% were found among these eight entries. PI 217923 was found to have the highest fg% among the eight entries.
基金
supported by the Halliburton Energy Services,Inc.,USA
