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Articles by John K. Hemphill
Total Records ( 2 ) for John K. Hemphill
  John K. Hemphill , Huseyin Basal and C. Wayne Smith
  Abiotic stress conditions such as drought, salt and high temperature reduce yields of crop plants by as much as 70%. Therefore, advancement of salt-tolerance in cotton requires the identification of plant genetic diversity that exists, theoretically, in cultivars, which are adapted to arid growing regions. The exotic race stock accessions should possess salt-tolerant genes since many of these Gossypium hirsutum germlines were collected in the arid regions of Mexico and Central America. The objective of this project was to develop a screening technique to identify the cultivars and exotic germlines that possessed salt-tolerant genes. Since the early stages of a plant`s life cycle are generally believed to be the most sensitive stages, we screened several conventional cultivars as controls and several exotic race stock accessions for their ability to tolerate increased salt levels during seed germination-radical elongation (growth chamber) and seedling maturation (hydroponic conditions in a greenhouse). It was concluded that this screening technique resulted in the identification of plants that survived these conditions and represent likely candidates for use in our plant-breeding program.
  Huseyin Basal , John K. Hemphill and C. Wayne Smith
  Cotton is considered a moderately salt-tolerant crop, however, cotton varieties differ in the level of salt- tolerance and high salinity reduces growth, yield and fiber quality in a different extent. The objectives of this study were to determine the response of selected CRS accessions to salt stress and to identify salt-tolerant CRS accession(s) or individual plants within these accessions that potentially could be used as parental material for further investigation of salt tolerance in cotton. Seedling of four putative salt-tolerant (M-9044-0031, M-9044-0061, M-9044-0140 and M-9044-0150) and three salt-sensitive CRS accessions (M-9044-0060, M-8744-0091 and M-8744-0175) plus Acala 1517-88, Deltapine 50 and TAM 94-L25 were grown under hydroponic culture with two different salt concentrations (150 and 200 mM NaCl) and control. The study was carried out under completely randomized experimental design. Significant differences were observed among cotton genotypes for Shoot (SL) and Root Length (RL) and Shoot Dry Weights (SDW) and Root Dry Weights (RDW) reduction with the increasing salt levels. It was concluded that CRS lines, M-9044-0060, M-9044-0061 and M-8744-0091, may provide additional insights and parental material for breeding for salt tolerance in upland cotton. In addition, selected single plants from salt-tolerant CRS lines were transferred to pots to obtain seeds for further investigation of salt tolerance in cotton.
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