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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Further evidence that a terminal drought tolerance QTL of pearl millet is associated with reduced salt uptake
Environmental and Experimental Botany, Volume 102, Year 2014
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Description
Earlier, we established that a major drought tolerance QTL on linkage group 2 of pearl millet is also associated with reduced salt uptake and enhanced growth under salt stress. Present study was undertaken to re-assess the performance of drought tolerant (PRLT 2/89-33) and drought sensitive (H 77/833-2) parents along with two QTL-NILs (ICMR 01029 and ICMR 01040), under salinity stress specifically imposed during post-flowering growth stages when plants had developed their ion sinks in full. Time course changes in ionic accumulation and their compartmentalization in different plant parts was studied, specifically to monitor and capture changes conferred by the two alleles at this QTL, at small intervals. Amongst different plant parts, higher accumulation of toxic ion Na+ was recorded in roots. Further, the Na+ concentration in roots of the testcross hybrid of the drought-sensitive parent (H 77/833-2) reached its maximum at ECiw 15dSm-1 within 24h after salinity imposition, whereas it continued to increase with time in the testcross hybrids of the drought tolerant parent PRLT 2/89-33 as well as those of its QTL-NILs (ICMR 01029 and ICMR 01004) and reached at its maximum at 120h stage. Comparison of differential distribution of toxic ions in individual leaves revealed that Na+ ions were not uniformly distributed in the leaves of the drought-tolerant parent and drought-tolerant QTL-NILs; but accumulated preferentially in the older leaves, whereas the hybrid of the drought-sensitive parent showed significantly higher Na+ concentration in all main stem leaves irrespective of their age. Dynamics of chlorophyll and proline concentration variation studied under salt stress at late flowering stages revealed a greater reduction, almost twice, in both leaf chlorophyll and proline concentrations in younger leaves in the hybrids of the sensitive parent as compared to the tolerant parent and QTL NILs. Imposition of salinity stress even at flowering stage affected the yield performance in pearl millet, wherein higher yield was recorded in drought tolerant parent and the two QTL-NILs compared to drought sensitive parent. © 2014 The Authors.
Authors & Co-Authors
Sharma, Parbodh Chander
India, Karnal
Icar - Central Soil Salinity Research Institute, Karnal
Singh, Dhananjay
India, Karnal
Icar - Central Soil Salinity Research Institute, Karnal
Sehgal, Deepmala
United Kingdom, Aberystwyth
Institute of Biological, Environmental and Rural Sciences
Mexico, Texcoco
Centro Internacional de Mejoramiento de Maiz y Trigo
Singh, Gurbachan
India, Karnal
Icar - Central Soil Salinity Research Institute, Karnal
India, New Delhi
Icar - Agricultural Scientists Recruitment Board, new Delhi
Hash, Charles Tom
Niger, Niamey
International Crops Research Institute for the Semi-arid Tropics Sahelian Center Niamey
Yadav, Rattan S.
United Kingdom, Aberystwyth
Institute of Biological, Environmental and Rural Sciences
Statistics
Citations: 33
Authors: 6
Affiliations: 5
Identifiers
Doi:
10.1016/j.envexpbot.2014.01.013
ISSN:
00988472
Research Areas
Environmental