Identification of QTLs for stay green trait in wheat (Triticum aestivum L.) in the ‘Chirya 3’ × ‘Sonalika’ population

Abstract

Stay green or delayed senescence is considered to play a crucial role in grain development in wheat when assimilates are limited. We identified three QTLs for stay green on the chromosomes 1AS, 3BS and 7DS using a recombinant inbred (RI) population developed by making crosses between the stay green parent 'Chirya 3' and non-stay green 'Sonalika'. The RI lines were evaluated in natural field conditions for 2 years in replicated trial. The QTL on chromosome 1A was identified in both the years, while the QTLs on 3BS and 7DS were identified only in 1st and 2nd year, respectively. The QTLs explained up to 38.7% of phenotypic variation in a final simultaneous fit. The alleles for higher stay green values derived from the stay green parent 'Chirya 3'. The QTLs were named as QSg.bhu-1A, QSg.bhu-3B and QSg.bhu-7D. The QTL QSg.bhu-3B and QSg.bhu-7D were placed in the 3BS9-0.57-0.78 and 7DS5-0.36-0.61 deletion bins, respectively.

Comparative analysis of changes in leaf area index in different wheat genotypes exposed to high temperature stress by late sown condition

“…Ihsan et al (2016) also reported that growth and leaf area of all wheat varieties gradually decreased with delay in sowing. Genotypic difference in green leaf area duration and stay green character in response to heat stress is also reported by (Kumar al et., 2010). Grain yield which is the important agronomic traits for a crop is highly effected by the date of sowing or high temperature, Maximum grain yield is obtained by Raj 4101, HI1544 and HW5021 in timely sown condition but in late sown condition Lok54, Raj 4101 and DBW140 were the good performer.…”

Physiological Traits for Improving Heat Tolerance in Wheat

“…This is partly because chlorosis is an integral part of programmed senescence, where there are unavoidable tradeoffs between maintaining photosynthetic area and remobilization of nitrogen to the maturing grain (Vijayalakshmi et al, 2010). Nonetheless, relationships between yield and SG have been shown, and QTLs have been identified in mapping populations (Kumar et al, 2010;Vijayalakshmi et al, 2010; Table I). Since chlorosis is expressed heterogeneously on all aboveground organs, even within a single organ such as a leaf, it is not straightforward to parameterize.…”

Physiological traits associated with heat tolerance in bread wheat (Triticum aestivum L.)

“…Canopy temperature is an ideal trait showing a good genetic association with yield (Saint Pierre et al 2010). The relationship between yield and stay green trait have been discussed and quantitative trait loci (QTL) have been identified in mapping populations (Kumar et al 2010;Vijayalakshmi et al 2010). …”