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- W2133586241 abstract "An investigation was carried out to estimate the number of cell initials in the mature embryo of dormant seeds of cultivated grain Sorghum with mutagenic treatments. Dry seeds of S. subglabrascens (Co. 18) were treated with a wide range of physical and chemical mutagens, X-rays, gamma rays, EMS, MMS, DES, NMU, NEU and MNG and also with combination treatments of gamma rays and EMS, MMS and DES. A total of 317 segregating M1 panicle progenies was studied in the M2 generation for the ratio of normal to chlorophyll mutant seedlings. The mutant phenotypes are albina, xantha, viridis, chlorina, striata, tigrina, xanthalba and alboviridis. A total of 161 M1 plant progenies showed a good fit, while the rest of the progenies (156) deviated significantly in both directions from file expected segregation of 3:1. This was interpreted as being due to the origin of M1 plants from both single cell initials and from multicellular initials following mutagenic treatments, the former segregating for 3:1, while the latter significantly deviating from 3:1. The data on the different mutant phenotypes also revealed the existence of single and multicellular initials in the matured embryo of grain Sorghum. The excess of deficiencies noticed in the mutant phenotypes in the segregating M1 panicle progenies might be due to a large extent to the chimeric nature of multicellular initials and to a less extent also due to factors operating on gametes and zygotes following mutagenic treatments. An assessment of M1 fertility as related to the distribution of chi square deviations on 3:1 ratio indicated that the M1 plants with low fertility are frequently derived from single cell initials and the M1 plants with high fertility may commonly arise from multicellular initials." @default.
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- W2133586241 date "1972-02-01" @default.
- W2133586241 modified "2023-09-24" @default.
- W2133586241 title "An estimation of the number of initials in grain Sorghum using mutagenic treatments" @default.
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- W2133586241 doi "https://doi.org/10.1016/s0033-7560(72)90015-4" @default.
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