Photoperiod Insensitivity in Pigeonpea Introgression Lines Derived from Wild Cajanus Species

Hussain, M E and Sharma, S and Joel, A J and Kilian, B (2022) Photoperiod Insensitivity in Pigeonpea Introgression Lines Derived from Wild Cajanus Species. Agronomy (TSI), 12 (6). pp. 1-14. ISSN 2073-4395

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Abstract

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 X 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.

Item Type:	Article
Divisions:	Global Research Program - Accelerated Crop Improvement
CRP:	CGIAR Research Program on Grain Legumes and Dryland Cereals (GLDC)
Uncontrolled Keywords:	photoperiod, photoperiod insensitivity index, introgression lines (ILs), facultative, quantitative, wild Cajanus species, pigeonpea
Subjects:	Mandate crops > Pigeonpea
Depositing User:	Mr Nagaraju T
Date Deposited:	18 Jan 2024 05:28
Last Modified:	18 Jan 2024 05:30
URI:	http://oar.icrisat.org/id/eprint/12381
Official URL:	https://www.mdpi.com/2073-4395/12/6/1370
Projects:	UNSPECIFIED
Funders:	Government of Norway, Global Crop Diversity Trust, CGIAR Research Program on Grain Legumes and Dryland Cereals (GLDC).
Acknowledgement:	We thank Jennifer Smith for editing the English text of a draft of this manuscript.
Links:	Google Scholar

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