Mapping QTLs Linked to Physio-Morphological and Plant Production Traits under Mapping QTLs Linked to Physio-Morphological and Plant Production Traits under
Journal Title: American Journal of Biochemistry and Biotechnology - Year 2006, Vol 2, Issue 4
Abstract
Drought stress is a major constraint for rice (Oryza sativa L.) production and yield stability in rainfed ecosystems. Identifying genomic regions (QTLs) contributing in drought resistance will help to develop rice cultivars suitable for water-limiting environments through marker-assisted breeding. QTLs linked to physio-morphological and plant production traits under drought stress in the field were mapped by evaluating 177 F6 recombinant inbred (RI) lines of Bala × Azucena under rainfed conditions in the target environment (TE). The rice lines were subjected to severe drought stress during reproductive phase due to a natural rainfall failure event. The RI lines showed significant variation in physio-morphological and plant production traits under stress. A total of 24 QTLs were identified for various traits under stress, which individually explained 4.6 to 22.3% phenotypic variation. Composite interval mapping detected three markers viz., RM3894, RG409 and G1073 on chromosomes 3 and 8 linked to grain yield under drought stress in TE, respectively explaining 22..3, 17.1 and 10.9% of phenotypic variation. QTLs for leaf drying, days to 50% flowering and number of productive tillers under drought stress co-located at certain of these regions. Further, QTLs for several root traits overlapped with QTLs for grain yield under stress in these RI lines, indicating the pleiotropic effects of root trait QTLs on rice performance under stress. Correlation coefficients between potential root traits determined in another study and plant production under stress in this study were not significant in these RI lines. Consistent QTLs for drought resistance traits and yield under drought stress in TE were detected and might be useful for rainfed rice improvement.
Authors and Affiliations
S. Michael Gomez
Keywords
Related Articles
- EP ID EP144381
- DOI -
- Views 105
- Downloads 0
The Biology of p21 Waf1/Cip1 - Review Paper
p21 WAF1/Cip1 belongs to the Cip/Kip family of cyclin kinase inhibitors (CKI) (p21 Waf1/Cip1 , p27 Kip1 , p57 Kip1 ). p21 Waf1/Cip1 was first described as a potent and universal inhibitor of cyclin-dependent kinases (C...
Nanoceramic Matrices: Biomedical Applications
Natural bone consisted of calcium phosphate with nanometer-sized needle-like crystals of approximately 5-20 nm width by 60 nm length. Synthetic calcium phosphates and Bioglass are biocompatible and bioactive as they bo...
On Application of Carhart Atom Pairs to Predict Anticonvulsant Activity
About 50 million people in the world suffer from epilepsy, especially in childhood, adolescence and old age. Available treatment fails to control epilepsy in up to 30% of affected people. In developing countries, howev...
Bioceramics for Tissue Engineering Applications – A Review
Three dimensional (3-D) scaffolds have been explored in an attempt to persuade the body to heal or repair tissues that do not do so spontaneously. Considerable advances in tissue engineering and regeneration have been...
Biochemical and Immunological Study on the Effects of Barley and its Components as Hypoglycemic Agents in Diabetic Rats
The present study was carried out to investigate the hypoglycemic effect of barley (Hordeum vulgare L) and some of its components such as amino acids (L-leucine and L-glutamine) and chromium picolinate on some biochemica...