Photoperiod Insensitivity in Pigeonpea Introgression Lines Derived from Wild Cajanus Species

Pigeonpea is a photoperiod-sensitive crop; therefore, the introgression of photoperiod insensitivity could increase its adaptability to new environments. We determined the effect of extended daylength (ED; 16 h light) on the phenotypical traits of extra-early, early, and mid-early maturing pigeonpea...

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Bibliographic Details
Published in:Agronomy (Basel) 2022-06, Vol.12 (6), p.1370
Main Authors: Hussain, Mohammad Ekram, Sharma, Shivali, Joel, A. John, Kilian, Benjamin
Format: Article
Language:English
Subjects:
Abiotic stress
Adaptability
Agricultural production
Cajanus
Crops
Cultivars
Daylength
facultative
Flowering
Genetic diversity
Genotypes
Heritability
introgression lines (ILs)
photoperiod
photoperiod insensitivity index
Pigeonpeas
Population
quantitative
Seeds
wild Cajanus species
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Summary:Pigeonpea is a photoperiod-sensitive crop; therefore, the introgression of photoperiod insensitivity could increase its adaptability to new environments. We determined the effect of extended daylength (ED; 16 h light) on the phenotypical traits of extra-early, early, and mid-early maturing pigeonpea introgression lines (ILs) derived from wild Cajanus species belonging to secondary and tertiary gene pools. Plants were grown under natural daylength and extended daylength in a greenhouse. Comparisons of the time of floral bud initiation, days to flowering, plant height, number of branches, and number of leaf nodes on the main stem at flowering revealed photoperiod-insensitive lines. All traits varied widely among the ILs. Analyses of flowering traits revealed large genetic components with low genotype × treatment interactions and high broad-sense heritability. The photoperiod most strongly affected the number of primary branches, followed by plant height. The extended day advanced flowering by approximately four days in extra-early ILs, confirming that these ILs are quantitative, short-day plants. The photoperiod insensitivity index varied from 0.88 in ICPP 171541 (moderately photoperiod sensitive) to 0.99 in ICPP 171546 and ICPP 171561 (photoperiod insensitive). These photoperiod-insensitive extra-early flowering ILs can be used to enrich the genetic diversity of pigeonpea and to develop photoperiod-insensitive cultivars for cultivation in new environments.
ISSN:2073-4395
2073-4395
DOI:10.3390/agronomy12061370