6 Types of Inflorescence and Fruits in Tomato 



The results suggest that partial coupling occurs between the factor 

 for simple inflorescence and that for short fruit, but the numbers are 

 not sufficiently large to form any conclusion as to the intensity of the 

 coupling, nor to establish the existence of the same with certainty. 



In F3 182 plants were grown from parents with the compound type 

 of inflorescence, and they were all constant to the compound type. 



The apparent position of 254 inflorescences borne by these plants 

 and the number of nodes that occurred between them were recorded. 

 In 227 the adnation was complete, as in the Text-fig. B, and the 

 remaining 27 were either fused to the axillary growth beyond, or 

 displaced. There was more irregularity in the number of nodes that 

 occurred between the inflorescences: in 12 cases less than six nodes 

 occurred, and in 24 more than six; in the remaining 191 cases the 

 usual six nodes occurred. 



The number of nodes and the position of 611 inflorescences on plants 

 with the simple type of inflorescence were also recorded. 554 were 

 constant, breaking away at an internode as Text-fig. A, and also in 

 the occurrence of three nodes between them. Usually in the exceptions 

 the inflorescences arose at a node, and more than three nodes occurred 

 between them. 



The above records show that although the characters in question 

 are not constant they are very regular, and that they are correlated to 

 the form of the inflorescence. 



F3. Fruit Shape. 



Some interesting cases ha\'e occurred in regard to fruit shape in the 

 F-i generation. The longs all bred true to length, but they are not all 

 constant to shape. Family No. jf (Plate VI, fig. 15) is a case of a full 

 long throwing pyriform longs, the actual numbers being fifteen full 

 longs to three pyriform longs'. 



Family No. y\ (Plate VI, fig. IG) is a pyriform long which has 

 thrown a type with a further constriction at the neck of the fruit. 

 This type I have not previously seen, and owing to its similarity in 

 shape to the calabash g(jurd, I have named it calabash ; it appeared 



' Price and Drinkard found tliat their pyriform types were recessive to uncoustricted 

 types, and they state that pyriform types are correlated with a peculiar structure of the 

 corolla. In the case of my pyriform types this was not evident, and no difference is 

 apparent in the flowers of the calabash and pyriform types, hut there is an anatomical 

 difference in the various types of fruits. 



