Mechanism of water-logging tolerance in pigeonpea
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Authors
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A. J. Hingane
International Crops Research Institute for the Semi-Arid Tropics, Patancheru 502 324, Andhra Pradesh
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K.B. Saxena
International Crops Research Institute for the Semi-Arid Tropics, Patancheru 502 324, Andhra Pradesh
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S.B. Patil
International Crops Research Institute for the Semi-Arid Tropics, Patancheru 502 324, Andhra Pradesh
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R. Sultana
Bihar Agricultural University, Bhagalpur, Bihar
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S. Srikanth
International Crops Research Institute for the Semi-Arid Tropics, Patancheru 502 324, Andhra Pradesh
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N. Mallikarjuna
International Crops Research Institute for the Semi-Arid Tropics, Patancheru 502 324, Andhra Pradesh
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R. Vijakumar
International Crops Research Institute for the Semi-Arid Tropics, Patancheru 502 324, Andhra Pradesh
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C.V. Sameer Kumar
International Crops Research Institute for the Semi-Arid Tropics, Patancheru 502 324, Andhra Pradesh
Abstract
A study was undertaken to identify the morphophysiological traits associated with water-logging tolerance in pigeonpea [Cajanus cajan L. (Millsp.)].The formation of aerenchyma cells, lenticels, and adventitious roots in the
tolerant genotypes were found to be associated with waterlogging tolerance in pigeonpea. The tolerant genotypes, namely, ICP 5028, ICPH 2431, ICPL 87119, ICPH 2740, ICPL 149, ICPL 20241, and MAL15, exhibited varying responses
to hypoxic conditions. Formation of aerenchymatous cells was common in all the water-logging tolerant genotypes. Besides this, five tolerant genotypes (ICP 5028, ICPH 2431, ICPL 87119, ICPH 2740 and MAL 15) developed lenticels,
while ICPL 149 and ICPL 20241 formed prominent adventitious roots. None of these traits was present in the susceptible genotypes.These traits developed only when exposed to water-logging stress and facilitated oxygen supply from stem to roots helping in respiration of the suffering plants. Potential breeding strategies to develop pigeonpea genotypes with enhanced levels of waterlogging tolerance are discussed.