Inheritance of photo-sensitivity in pigeonpea (original) (raw)
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Saxena, K. B., Wallis, E.S., Chauhan, Y. S. and Byth, D.E. (2021)Inheritance of photo-sensitivity in pigeonpea. Indian Journal of Genetics, 81 (1).
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Abstract
Pigeonpea [Cajanus cajan (L.) Millsp.] is a short-day legume species and the late maturing genotypes are more photosensitive than early types. To generate information about the inheritance of photo-sensitivity, this study was conducted under natural and artificially extended (16 h) photo-periods using F1, F2 and BC1F1 generations. Under natural photo-period, F1 hybrids showed partial dominance of earliness; while in F2, a normal distribution that was skewed towards earliness was observed. In contrast under extended photo-period, the spread of F2 data was wide with discontinuities recorded at day 70, 82 and 103. Chisquare tests, when applied to F2 and BC1F1 data, suggested that three dominant genes (PS3, PS2 and PS1) controlled the expression of photo-sensitivity. These genes were found operating in a hierarchical order with PS2 and PS1 genes failing to express in the presence of PS3 gene. Similarly in the absence of PS3 gene, PS2 expressed but it masked the expression of PS1. Further, PS1 gene expressed only when both PS3 and PS2 were in recessive homozygous state. Hence, the proposed genetic model for photosensitivity in pigeonpea is PS3 > PS2 > PS1 and photoinsensitive genotype being a triple recessive (ps3ps3ps2 ps2ps1ps1).
| Item Type: | Article |
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| Business groups: | Crop and Food Science |
| Additional Information: | Open access |
| Keywords: | Cajanus cajan, chi-square, photoinsensitivity, qualitative inheritance. |
| Subjects: | Science > Botany > GeneticsAgriculture > Agriculture (General) > Agricultural meteorology. Crops and climateAgriculture > Agriculture (General) > Methods and systems of culture. Cropping systemsPlant culture > Field cropsPlant culture > Field crops > Other field crops |
| Live Archive: | 22 Mar 2021 00:18 |
| Last Modified: | 03 Sep 2021 16:46 |
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