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Utilizing Wild Cajanus platycarpus, a Tertiary Genepool Species for Enriching Variability in the Primary Genepool for Pigeonpea Improvement

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Relation http://oar.icrisat.org/11572/
https://doi.org/10.3389/fpls.2020.01055
doi:10.3389/fpls.2020.01055
 
Title Utilizing Wild Cajanus platycarpus, a Tertiary Genepool Species for Enriching Variability in the Primary Genepool for Pigeonpea Improvement
 
Creator Sharma, S
Paul, P J
Sameer Kumar, C V
Nimje, C
 
Subject Plant Genetics
Plant Breeding
Plant Nutrition
Pigeonpea
 
Description The use of crop wild relatives in the breeding program has been well recognized to
diversify the genetic base along with introgression of useful traits. Cajanus platycarpus
(Benth.) Maesen, an annual wild relative belonging to the tertiary genepool of pigeonpea,
possesses many useful traits such as early maturity, high protein content, photoperiod
insensitivity, and pod borer tolerance for the genetic improvement of cultivated pigeonpea.
Using this cross incompatible wild Cajanus species, an advanced backcross population
was developed following the embryo rescue technique. In the present study, a prebreeding
population consisting of 136 introgression lines (ILs) along with five popular
varieties (used as checks) was evaluated for important agronomic traits during 2016 and
2017 rainy seasons and for grain nutrient content during 2016, 2017, and 2018 rainy
seasons. Large genetic variation was observed for agronomic traits such as days to 50%
flowering, number of pods per plant, pod weight per plant, grain yield per plant, and grain
nutrients [protein content, grain iron (Fe), zinc (Zn), calcium (Ca), and magnesium (Mg)] in
the pre-breeding population. Significant genotype × environment interaction was also
observed for agronomic traits as well as grain nutrients indicating the sensitivity of these
traits to the environments. No significant correlations were observed between grain yield
and grain nutrients except grain Zn content which was negatively correlated with grain
yield. Overall, 28 promising high-yielding ILs with high grain nutrient content were
identified. These ILs, in particular, ICPP # 171012, 171004, 171102, 171087, 171006, and 171050 flowered significantly earlier than the popular mega variety, ICPL 87119 (Asha) and thus hold potential in developing new short-duration cultivars. The comprehensive multi-site assessment of these high-yielding, nutrient-rich accessions would be useful in identifying region-specific promising lines for direct release as cultivars. Moreover, these ILs are expected to replace the popular existing cultivars or for use as new and diverse sources of variations in hybridization programs for
pigeonpea improvement.
 
Publisher Frontiers Media
 
Date 2020-07
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://oar.icrisat.org/11572/1/fpls-11-01055_C%20platycarpus.pdf
Sharma, S and Paul, P J and Sameer Kumar, C V and Nimje, C (2020) Utilizing Wild Cajanus platycarpus, a Tertiary Genepool Species for Enriching Variability in the Primary Genepool for Pigeonpea Improvement. Frontiers in Plant Science (TSI), 11 (1055). pp. 1-11. ISSN 1664-462X