Inheritance of Deformed Leaves in Pharbitis Nil

• Published in: Botanical gazette (Chicago, Ill.) Ill.), 1925-11, Vol.80 (3), p.276-287
• Main Author: Imai, Yoshitaka
• Format: Article
• Language: English
• Subjects: Genetic inheritance; Leaves; Medical genetics; Mortality; Plant growth; Plants; Segregation
• ISSN: 0006-8071
• DOI: 10.1086/333537

Under the heading of "Deformed leaves" the writer dealt with the genetic behavior of the variegated and the deficient leaves. Summing up, the results are: 1. The variegation is transmitted as a simple recessive to the wholly colored condition. 2. In some crosses of the variegated and the wholly colored leaves there appread unexpectedly a new type of variegation, called "Gejigeji," a faint variegated pattern. 3. The Gejigeji type is caused by a recessive factor, its dominant allelomorph being a normal variegation on the common basis of the double v. 4. The representation of the Gejigeji pattern is limited to the variegated individuals, the effect not being apparent in the self-colored leaves. 5. The ratio in the dihybrid segregation is a 12:3:1 with reference to the wholly colored, the commonly variegated, and the Gejigeji leaves. 6. The effect of the deficient leaf factor appears in both cotyledons and leaves. 7. The deficient leaf looks just like a symptom of some disease, yet it is caused by a genetic factor. The abnormality behaves as a simple recessive to the normal. 8. The representation of the deficient feature is not manifested on all leaves of the plant, only a few leaves in on individual being affected. 9. For this reason there may sometimes be found deficient leaves which are quite normal, failing to show the proper characteristic throughout their plant growth. 10. The false normals may either breed true or produce again a few normals among the deficient offspring. 11. The failing proportion of the deficient leaves is about 13 per cent in the direct calculation, while it attains about 40-70 per cent in the indirect process. 12. The difference of two values may perhaps be mainly due to the unequal mortality of the deficient leaves. If this is the case, the so-called indirect value is of absolute frequency plus a. 13. We except the value to fluctuate depending on the condition of the plant growth.