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Symbiotic efficiency of pigeonpea (Cajanus cajan (L.) Huth) with different sources of nitrogen

Published online by Cambridge University Press:  31 May 2021

Francina L. Bopape ,
Eastonce T. Gwata Open the ORCID record for Eastonce T. Gwata [Opens in a new window] ,
Ahmed I. Hassen  and
Marvellous M. Zhou
Francina L. Bopape
Affiliation:
Agricultural Research Council, Plant Health and Protection, Private Bag X134, Queenswood0121, South Africa Department of Crop Science, School of Agriculture, University of Venda, Private Bag X5050, Thohoyandou0950, South Africa
Eastonce T. Gwata*
Affiliation:
Department of Crop Science, School of Agriculture, University of Venda, Private Bag X5050, Thohoyandou0950, South Africa
Ahmed I. Hassen
Affiliation:
Agricultural Research Council, Plant Health and Protection, Private Bag X134, Queenswood0121, South Africa
Marvellous M. Zhou
Affiliation:
South African Sugarcane Research Institute, P/Bag X02, Mount Edgecombe4300, South Africa
*
*Corresponding author. E-mail: [email protected]
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Abstract

Pigeonpea is an important grain legume. It contributes to the improvement of soil fertility through biological nitrogen (N) fixation. However, the symbiotic efficiency of pigeonpea with native soil rhizobia has not been determined adequately. This study was designed to determine the variation in the N fixation ability of pigeonpea inoculated with the native rhizobia. Forty soil samples were collected from diverse locations across South Africa and used for inoculating pigeonpea seed. Each pigeonpea genotype was inoculated separately with each soil sample and raised in a nitrogen-depleted growth medium in the greenhouse. A split-plot experimental design was used in the study. Several N fixation variables of pigeonpea were measured. There was >40.0% difference in the number of nodules between genotypes ‘Ex-PP-MD-321’ and ‘Mpuma-B-Spot’ but the nodule dry weight between the two genotypes was >80.0%. In contrast, the heaviest dry shoots (0.4513 g), weighed 52.0% heavier than those that were observed for ‘Mpuma-B-Spot’. Pigeonpea showed differential N fixation ability with the nodules, suggesting that there was potential to select for optimum host × rhizobial isolate combinations for the process and to expand the production area of the crop.

Keywords

: genotypehostnitrogen fixationnodulationrhizobia
Type
Short Communication
Information
Plant Genetic Resources , Volume 19 , Issue 4 , August 2021 , pp. 312 - 315
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of NIAB

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