-18- 



N. C. The Comparative Cytogenetics of Upland Cottons and Re- 



lated Diploid Species * To (1) maintain collection of wild 

 species of Gossypium in a vigorous condition; (2) assess their 

 value with regard to characters of potential economic value 

 which they may possess; (3) hybridize them with cultivated 

 cottons, giving emphasis to obtaining hybrids with American 

 wild species; (4) synthesize fertile types by colchicine treat- 

 ment of initial hybrids & backcross them to Upland cottons; 

 (5) investigate cyto logical mechanism in such backcrosses mak- 

 ing use of cytological & cytogenetic methods; & (6) develop 

 efficient techniques of transferring characters of potential 

 economic importance based on a more complete understanding of 

 cytological mechanism. 



Agron. 60 (S-l) Coop. ARS 



N. C. Cotton Improvement and Breeding Methodology . To (1) in- 



troduce & transfer desirable germ plasm from various wild cul- 

 tivated Gossypium species into adapted Upland cottons, with 

 emphasis on improved fiber properties; (2) develop & evaluate 

 more efficient cotton breeding techniques; & (3) evaluate 

 current varieties & new strains for N. C. 

 Agron., Statis. 63 Coop. ARS 



N. C. The Internal Mechanism of Species Generation in Cotton . 



To analyze & evaluate internal factors which account for 

 differentiation & genetic isolation of interfertile species, 

 including (l) recombination & transmission of genes in inter- 

 specific hybrid progenies; (2) effects of introgression on 

 gene action, expression & coordination; & (3) comparative 

 studies of homologous genetic loci in related species at bio- 

 chemical level. 

 Genet. H-71 



N. C. An Analysis of Preference Exhibited by Boll-Weevils for 



Certain Varietal Characteristics of Cotton, and an Evaluation 

 of the Possibility of Breeding for Resistance to Boll-Weevil. 

 (Anthonomus Grandis Boh. ) (1) Assemble a collection of simply 

 inherited, morphological & physiological varients in cotton 

 deterrent to boll-weevil. (2) Test if weevils exhibit prefer- 

 ences when offered choice of hosts in replicated tests. (3) 

 Combine into 1 strain all variant physiological & morphological 

 characteristics weevil has exhibited a negative preference for. 

 Genet., Field Crops 73 



Tenn. Production and Improvement of Cotton Varieties Suitable 



to Tennessee Conditions . Improvement by (1) selection of estab- 

 lished varieties, (2) crossing standard upland varieties, & (3) 

 hybridizing between long-staple & upland varieties. 

 Bot. 79 



