UNIVERSITY OF CALIFORNIA PUBLICATIONS 



IN 



BOTANY 



Vol. 5, No. 7, pp. 233-248 Issued June 25, 1915 



NOTES ON THE GERMINATION OF TOBACCO 



SEED, II 



BY 



THOMAS HAEPER GOODSPEED 



In a previous report (Goodspeed, 1913) an outline was given of 

 the possibly important supplementary results to be obtained by com- 

 paring the rates of germination and the amount of germination of the 

 seed used in breeding experiments to produce the pedigreed plants. 

 The results of the germination tests therein tabulated indicated that 

 there were, in the first place, distinctions between the rates of germi- 

 nation of the seed of reciprocal hybrids and, in the second, that the 

 rates and possibly also the amounts of germination of the seed of F^ 

 and F2 hybrids were significantly differentiated. The present paper 

 aims to present further evidence in support of these previous sug- 

 gestions and conclusions. The relation between the age of the seed 

 of certain of our pure-line cultures, and of the seed of hybrids made 

 between them, and the viability of this seed, was also taken up in the 

 previous communication. It will be further considered in what follows. 



The tables below give the amount and time of germination of the 

 seed of various pure lines and hybrids of Nicotiana under their num- 

 bers in the University of California Botanical Garden (U. C. B. G.). 

 A list of the species employed, together with the hybrids between them, 

 follows in the order in which they appear in the various tabulations. 



30/06— "White Tobacco" (ef. Setchell, 1912, p. 7). 

 17/07 — Nicotiana rustica var. texana {ibid., p. 15). 

 16/07 — A'', rustica var. scabra (ibid., p. 14). 

 68/07— iV. angmtifolia (ibid., p. 9). 

 22/07 — N. Tabacum var. marrophyJIa (ibid., p. 8). 

 78/05— iV. Tabacum "Maryland" (ibid., p. 5). 

 72/05— "Cavala" (ibid., p. 5). 

 H 23—30/06 X 22/07. 



•OTANIC'L 



