hh 



Okla. The Physiology of Seedling Vigor and Cold Tolerance in Cotton . 

 (1) Develop procedures in cooperation with plant breeders to select 

 for cold tolerance and vigor in germinating seed, seedlings, and 

 maturing plants. (2-5 To learn) (2) metabolic factors controlling 

 the degree of vigor under cold conditions and how related to germ- 

 ination, to post seedling development, and vigor ; (3) how phases 

 of environment and nutrition affect these responses to cold; (U) 

 effects of applied chemicals as growth regulators on cold responses; 

 (5) by cooperating with pathologists, the relationships between seed 

 reactivity and vigor and susceptibility or resistance to seedling 

 disease organisms and see how use of fungicides affect such rela- 

 tionships. 



Agron., PI. Path. 923 Coop. ARS 



Pa. Physiological and Nutritional Investigations of Corn and 



Other Crop Plants. To (1) develop tests to characterize funda- 

 mental interplant difference to aid in selection of inbreds, 

 varieties or species for specific conditions, and in management 

 of crops for production; and (2) evaluate inbred, varietal and 

 species differences in nutritional and water needs. 

 Agron. 1238 Coop. ARS 



Term. Use of Ionizing Radiations in Crop Improvement , (l) Obtain 

 plant material with characteristics giving improved agricultural 

 value by inducing mutations, by inducing chromosome interchanges 

 and other aberrations, by increasing crossing over between tightly 

 linked genes. (2) Produce monosomies in polyploids, by centromere 

 inactivation or asymmetric interchange. (3) Study effects of 

 altering conditions before, during, and after irradiation on 

 genetic effects of the rays. 

 Bot. 78 Coop. AEC 



Texas Inheritance of Sorghum . To (1) learn inheritance of charac- 

 ters in sorghum and their linkage relations as basis for further 

 crop improvement; (2) learn nature and inheritance of certain 

 physiological reactions in sorghum such as those to temperature 

 and photoperiod and evaluate effect of reactions on adaptation 

 of varieties; (3) learn role of certain physiological reactions 

 in expression of heterosis in sorghum; (h) classify varieties 

 and strains for genes important in choice of parents for breeding 

 programs and for use in sorghum hybrids; and (5) make cytogenetic 

 and genetic studies on mechanisms of sterility and relations of 

 perennial to annual legumes. 

 Agron. H°8 Coop. ARS 



Texas Improvement of Bramble Fruits for Texas . Breed and test 



varieties of bramble fruits adapted to home and commerce. Study 

 pathological and physiological diseases of same, with reference 

 to sterility factor of Lawton variety, to learn causes and con- 

 trol methods. Study chemical weed control and methods of appli- 

 cation with brambles. 



Hort., PI. Physiol., PI. Path. 1030 



