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Salinity tolerance in pigeonpea (Cajanus cajan (L.) Millsp.) and its wild relatives

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Title Salinity tolerance in pigeonpea (Cajanus cajan (L.) Millsp.) and its wild relatives
 
Creator Subbarao, G V
 
Subject Pigeonpea
 
Description In pigeonpea genetic variation for salinity tolerance appeared to be confined to a narrow range of salinity levels (6 to 7 ds/m). In wild relatives of pigeonpea (Atylosia, Rynchosia and Dunbaria sp.), there is a wider range of variation (4 to 12 ds/m) in salinity tolerance. A. albicans and Atylosia platycarpa were the two most tolerant wild types that could grow up to 12 ds/m. Salinity tolerance seems to be associated with exclusion of sodium and chloride from the shoot system, high potassium/sodium selectivity and high retention of sodium and chloride in the root system. These physiological traits, which are believed to be responsible for the higher level of tolerance to salinity in A. albicans, were uniformly expressed in the F1 hybrids (reciprocal crosses of A. albicans (tolerant) X pigeonpea genotype ICP 3783 (sensitive) suggesting that salinity tolerance is a dominant genetic factor. There was a positive growth response in pigeonpea genotypes with increasing calcium levels in the medium during salinity. The differences between tolerant and sensitive genotypes were maintained irrespective of the external calcium and sodium levels within a given salinity level (6 or 8 ds/m). The symbiotic ability of pigeonpea under saline conditions varied depending on the rhizobial strains, with IC 3087 and IC 3506 being more efficient than IC 3024, IC 3484 and IC 3195.
 
Date 1988
 
Type Thesis
NonPeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/2707/1/59095.pdf
Subbarao, G V (1988) Salinity tolerance in pigeonpea (Cajanus cajan (L.) Millsp.) and its wild relatives. PhD thesis, Indian Institute of Technology, Kharagpur, West Bengal.