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Studies on polyembryony in citrus



Studies on polyembryony in citrus



Seiken Ziho 8: 40-48



From investigations on polyembryony in Citrus, mainly C. unshiu C. natsudaidai and C. sulcata, no correlation was found between the number of seeds contained in a fruit and the mean embryo number per seed. The correlation coefficient fluctuated irregularly between +0.84 and -0.84, from year to year, from tree to tree, and even from branch to branch. Adjacent fruits are similar in seed number and in the variation of embryo number per seed. The mean embryo number varied according to the direction in which the fruiting branches were growing; it was higher on north-side than on south-side branches. But there was no significant difference between the top and the base of tree. The mean embryo number in adult plants (about 30 years old) was higher than that in young plants (about 5 years old). These differences were found in all species investigated, and were in all cases statistically significant. The mean embryo number in each plant tends to be higher in a year of abundant yield than in a year of poor yield. It is concluded that the mean embryo number per seed is considerably influenced by the physiological condition of tree.

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