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Photoperiod Insensitivity in Pigeonpea Introgression Lines Derived from Wild Cajanus Species

OAR@ICRISAT

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Relation http://oar.icrisat.org/12381/
https://www.mdpi.com/2073-4395/12/6/1370
https://doi.org/10.3390/agronomy12061370
 
Title Photoperiod Insensitivity in Pigeonpea Introgression Lines
Derived from Wild Cajanus Species
 
Creator Hussain, M E
Sharma, S
Joel, A J
Kilian, B
 
Subject Pigeonpea
 
Description 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.
 
Publisher MDPI
 
Date 2022-06-06
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Rights cc_by
 
Identifier http://oar.icrisat.org/12381/1/Agronomy_12_1-14_2022.pdf
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