SOME FACTOR RELATIONS IN MAIZE WITH 

 REFERENCE TO LINKAGE 



D. F. JONES AND C. A. GALLASTEGUI 

 Connecticut Agricultural Experiment Station 



In viow of the many distinct Mendelizing characters 

 known in maize {Zea waijs L.) it has been rather sur- 

 ])risinp: tliat so few cases of linkage have been reported in 

 this plant to the ])resent time. The number of chro- 

 mosome ])airs, al)out ten, is not large for plants and about 

 twenty distinct contrasting factors are known of which 

 the inheritance can be easily followed and about as many 

 more whicli offer some difficulty in following in transmis- 

 sion but which can be used more or less satisfactorily in 

 cari-ying on experiments on linkage. The writers have 

 made no systematic search for cases of linkage hi maize, 

 hut having found, almost a.videntally, what seems to be 

 a faii-ly good cas(> of linkage between the tunicate factor 

 which d('t(M-niin('s iho production or inhibition of the 

 glum.- .M.Nciin- the MM-<N and the factor f<.r Maivhy ..r 

 sweet .■nd<.-~|MTni. the rcilt^ arc reported here ii, the 

 ho])e tliat they ma\ be of use to others wlio may be pnr>u- 

 ing investigations alony this line. 



Collins and Kemptou (11)11) were the tir>t to record a 

 case of linkage in maize. Their re>nlt< involved the re- 

 lation of endos]xu"ni texture, as contrasted in our ordi- 

 nary starchy varieties with the waxy condition found in 

 Chinese vai'ieties, to the color of the aleurone layer. They 

 did not determine which of the several factors concerned 

 with alcnrone color wa-^ involved in thU litdcao-o. More 

 recenti.N r,re-^cr lia^ -iveii a<]diti<.nai proof of 



thi> .-jwe nf li„ka-e. lb- lia^ deternrnicd tlu" amount of 

 cro»ino--ovcr and lia^ aUo ^Imun tliat it i^ the (' aleurone 

 factor (Ka>t and lla>c^. IIMI : KnierMMi. 1!Mm which i^ 

 the one involved. At about the -anie time LiiuUtn^ni 

 (1917) reported the Mvond ca^' <.f linkage, that <.f one of 

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