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Singapore Journal of Scientific Research
  Year: 2011 | Volume: 1 | Issue: 2 | Page No.: 164-172
 
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Variation of Floral Abscission and Reproductive Efficiency in Different Cultivated Genotypes of Pigeonpea (Cajanus cajan)

Md. Hasnat Rahman, Md. Azharul Islam and Shahanara Begum

Abstract:
The present study has been undertaken to investigate the genotypic variation in flower and raceme production and floral abscission in four cultivated genotypes of pigeonpea (Cajanus cajan) plants. Genotypic differences in the number of flower production per plant and also in different parts of the canopy were significant. Significant variation existed in the total number of flower production/plant among the genotypes. The degree of flower production/plant is greater in ICPL-87 (1444.06) than in the SD-35 (925.66), ESD-19 (777.33) and ESD-39 (672.66). Total number of pods per plant significantly varied between the genotypes with the magnitude being again high in ICPL-87 (165.30), intermediate in SD-35 and ESD-19 (average of 111.1) and low in ESD-39 (77.80). Results revealed that the total number of reproductive unit (buds + flowers + pods that existed and abscised) varied between 1721.79 and 2753.98 among the genotypes. Total number of racemes per plant varied between 75.66 and 134.21. Percentage of abscission increased linearly with increasing time after first bud initiation and increases with the progression of nodal position. High degree of abscission in pigeonpea develops fewer pods. The abscission was greater in the secondary branch than in the primary branch. Percentage of floral abscission varied between 90 and 96 among the genotypes. It was observed that ICPL-87 is a high yielding genotype due to highest reproductive unit and lowest floral abscission and ESD-39 is a low yielding genotype. Our results suggest that, genotypic variation exists in sink (raceme and flower) production indicating increased sink production and decreased abscission may be used as selection criteria for improved yield in Short Duration (SD) pigeonpea.
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How to cite this article:

Md. Hasnat Rahman, Md. Azharul Islam and Shahanara Begum, 2011. Variation of Floral Abscission and Reproductive Efficiency in Different Cultivated Genotypes of Pigeonpea (Cajanus cajan). Singapore Journal of Scientific Research, 1: 164-172.

URL: https://scialert.net/abstract/?doi=sjsres.2011.164.172

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