scholarly journals Mechanistic Association of Quantitative Trait Locus with Malate Secretion in Lentil (Lens culinaris Medikus) Seedlings under Aluminium Stress

Plants ◽  
2021 ◽  
Vol 10 (8) ◽  
pp. 1541
Author(s):  
Chandan Kumar Singh ◽  
Dharmendra Singh ◽  
Shristi Sharma ◽  
Shivani Chandra ◽  
Ram Sewak Singh Tomar ◽  
...  
Keyword(s):  
Organic Acids ◽  
Quantitative Trait ◽  
Lens Culinaris ◽  
Recombinant Inbred Lines ◽  
Inbred Lines ◽  
Al Toxicity ◽  
Root Cells ◽  
Trait Locus ◽  
Ssrs Markers ◽  
Simple Sequence

Aluminium (Al) toxicity acts as a major delimiting factor in the productivity of many crops including lentil. To alleviate its effect, plants have evolved with Al exclusion and inclusion mechanisms. The former involves the exudation of organic acid to restrict the entry of Al3+ to the root cells while latter involves detoxification of entered Al3+ by organic acids. Al-induced secretion of organic acids from roots is a well-documented mechanism that chelates and neutralizes Al3+ toxicity. In this study, F6 recombinant inbred lines (RILs) derived from a cross between L-7903 (Al-resistant) and BM-4 (Al-sensitive) were phenotyped to assess variation in secretion levels of malate and was combined with genotypic data obtained from 10 Al-resistance linked simple sequence repeat (SSRs) markers. A major quantitative trait loci (QTL) was mapped for malate (qAlt_ma) secretion with a logarithm of odd (LOD) value of 7.7 and phenotypic variation of 60.2%.Validated SSRs associated with this major QTL will be useful in marker assisted selection programmes for improving Al resistance in lentil.

scholarly journals Quantitative trait locus mapping of gravitaxis behaviour in Drosophila melanogaster

2010 ◽  
Vol 92 (3) ◽  
pp. 167-174 ◽  
Author(s):  
CHRISTIE E. DESROCHES ◽  
MACARENA BUSTO ◽  
CRAIG A. L. RIEDL ◽  
TRUDY F. C. MACKAY ◽  
MARLA B. SOKOLOWSKI
Keyword(s):  
Drosophila Melanogaster ◽  
Candidate Genes ◽  
Quantitative Trait ◽  
Gravitational Force ◽  
Recombinant Inbred Lines ◽  
Inbred Lines ◽  
Chordotonal Organ ◽  
Trait Locus ◽  
Sense And Respond ◽  
Locus Mapping

SummaryDrosophila melanogaster, like other organisms, move and orient themselves in response to the earth's gravitational force. The ability to sense and respond to gravity is essential for an organism to navigate and thrive in its environment. The genes underlying this behaviour in Drosophila remain elusive. Using 88 recombinant inbred lines, we have identified four quantitative trait loci (QTLs) that contribute to adult gravitaxis (geotaxis) behaviour in Drosophila. Candidate genes of interest were selected from the QTLs of highest significance based on their function in chordotonal organ formation. Quantitative complementation tests with these candidate genes revealed a role for skittles in adult gravitaxis behaviour in D. melanogaster.

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