Some Genotypic Variation in Sorghum (Sorghum Bicolor (L.) Moench) Seed Related to Germination Temperature and Water Absorption PDF Download
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Author: C.P. Camargo Publisher: ISBN: Category : Languages : en Pages : 74
Book Description
Seed of 36 sorghum (Sorghum bicolor (L.) Moench) geneotypes selected on the basis of high physiological quality were evaluated to determine genotypic differences in response to germination temperatures ranging from 10 to 42C. Seed of high, medium, and low quality were evaluated to investigate seed quality-germination-tempearture relationships. Seed of 24 genotypes were dimensionally sized and permitted to imbile water to evaluate both genotypic variation in speed of water uptake and the influence of seed size on water imbibition. Sorghum seed of near maximum phusiological quality germinated equally well at temperatures between 20 and 30C. Among the range of genotypes evaluated, constant germination temperatures of 14 and 42C were the best for screening genotypes for their to germinate at low and high temperatures, respectively. Two genotypes, IS 1166C and SC 175-14, were equal to or better than all other genotypes at all germination temperatures evaluated. Five genotypes, E 35-1, MN 1958, MN 4508, IS 12685C and TPDXB1388 (9256) were very sensitive to germination temperatures outside the optimal range. Seed of lower physilogical quality were more sensitive to germination temperatures than those of high quality. However, there was a differential response among the genotypes. Regardless of genotype, small seed increased in moisture content more rapidly than large seed when water supply was not limited. Within the same size. there was genotypic varation both in the rate of moisture absorption and the time (...).
Author: C.P. Camargo Publisher: ISBN: Category : Languages : en Pages : 74
Book Description
Seed of 36 sorghum (Sorghum bicolor (L.) Moench) geneotypes selected on the basis of high physiological quality were evaluated to determine genotypic differences in response to germination temperatures ranging from 10 to 42C. Seed of high, medium, and low quality were evaluated to investigate seed quality-germination-tempearture relationships. Seed of 24 genotypes were dimensionally sized and permitted to imbile water to evaluate both genotypic variation in speed of water uptake and the influence of seed size on water imbibition. Sorghum seed of near maximum phusiological quality germinated equally well at temperatures between 20 and 30C. Among the range of genotypes evaluated, constant germination temperatures of 14 and 42C were the best for screening genotypes for their to germinate at low and high temperatures, respectively. Two genotypes, IS 1166C and SC 175-14, were equal to or better than all other genotypes at all germination temperatures evaluated. Five genotypes, E 35-1, MN 1958, MN 4508, IS 12685C and TPDXB1388 (9256) were very sensitive to germination temperatures outside the optimal range. Seed of lower physilogical quality were more sensitive to germination temperatures than those of high quality. However, there was a differential response among the genotypes. Regardless of genotype, small seed increased in moisture content more rapidly than large seed when water supply was not limited. Within the same size. there was genotypic varation both in the rate of moisture absorption and the time (...).
Author: Raymond Ngao Mutava Publisher: ISBN: Category : Languages : en Pages :
Book Description
Sorghum (Sorghum bicolor L. Moench) is the fifth most economically important cereal crop grown worldwide and adapted to a wide range of climatic conditions. Drought stress has been ranked as one of the most significant causes of crop yield loss with its effects on yield and yield components. Conservative water use by plants is one of the strategies that can be used as a drought coping mechanism. The slow wilting trait has been associated with conservative water use and has been found in some sorghum genotypes. The purpose of this study was to use canopy temperature to screen for drought tolerance in sorghum, evaluate water use efficiency for slow wilting sorghum genotypes and determine variability in root morphology and response to drought among sorghum genotypes. Canopy temperature studies were conducted under field conditions using infrared (IR) sensors while water use efficiency and root studies were conducted under greenhouse conditions. Our results showed a distinct separation in canopy temperature among genotypes under field conditions at 2:00 pm to 6:00 pm. Midday canopy temperature depression (CTD) was positively correlated to yield (R2 = 0.19) and harvest index (R2 = 0.11). CTD was also stable for all the genotypes during the period from 1:00 pm to 7:00 pm. There was a negative correlation between CTD and crop water stress index (CWSI) (R2 = 0.34) and a positive one between canopy temperature and CWSI (R2 = 0.50). Evaluation of genotypes for water use efficiency revealed significant variability among sorghum genotypes in the amount of water used (10.48 - 13.52 kg) and transpiration efficiency (TE) (2.64 - 7.11 g kg−1) among genotypes. Slow wilting genotypes were high in TE. Rooting depth increased for some genotypes under drought stress with genotype SC1124 recording the largest increase (180%). Total root length for some genotypes increased by 11 - 113% with genotypes SC224 and SC1019 recording the greatest increase. There was a positive correlation between water used and root length (R2 = 0.21). These results show that there is potential for selection of drought tolerance in sorghum and that genotypes with the slow wilting traits are efficient in water use.
Author: C.P. Camargo
Author: C.P. Camargo![Some Genotypic Variation in Sorghum [Sorghum Bicolor (L.) Moench] Seed Related to Germination Temperature and Water Absorption PDF](https://books.google.com/books/content/images/frontcover/qx8FYAAACAAJ?fife=w80-h100)
Author: Cilas Pacheco Camargo![Germination and Emergence of Sorghum [Sorghum Bicolor (L.) Moench] Genotypes Under Varying Levels of Soil Water and Osmotic Potential PDF](https://books.google.com/books/content/images/frontcover/3GboNwAACAAJ?fife=w80-h100)
Author: Gary A. Reusche![Germination and Emergence of Grain Sorghum [Sorghum Bicolor (L.) Moench] at Low and High Temperatures PDF](https://books.google.com/books/content/images/frontcover/zVYKOAAACAAJ?fife=w80-h100)
Author: Brian Clark Mustain
Author: John Arthur Mann![Genotypic Variability for Agronomic and Physiological Traits in Sorghum (Sorghum Bicolor [L.] Moench) with Optimum and Suboptimum Water Levels PDF](https://books.google.com/books/content/images/frontcover/zMAeOAAACAAJ?fife=w80-h100)
Author: Abdalla I. Sheikh-Mohamed
Author: Alfred Gilbert Olonjubeh Dixon![Genotypic Variability for Rate and Duration of Grain Fill in Sorghum (Sorghum Bicolor [L.] Moench) Grown Under Two Levels of Water Availability PDF](https://books.google.com/books/content/images/frontcover/EHoitwAACAAJ?fife=w80-h100)
Author: Sebastine Obi Onwuka
Author: Raymond Ngao Mutava
Author: Mauricio Riccelli-Mattei