, Volume 112, Issue 1, pp 69–78 | Cite as

Molecular marker assisted tagging of morphological and physiological traits under two contrasting moisture regimes at peak vegetative stage in rice (Oryza sativa L.)

  • G.S. Hemamalini
  • H.E. Shashidhar
  • Shailaja Hittalmani


Root morphology under well-watered conditions sampled on two occasions and under low-moisture stress was studied in a randomly chosen subset of 56 doubled haploid lines derived from a cross between IR64 and Azucena at two growth stages during the vegetative stage. A molecular map of the same population served as the basis for locating QTLs controlling root morphology and associated traits. The region flanking the RFLP markers RZ730 and RZ801 on chromosome 1 were associated with plant height in all three sampling environments. This position corresponds to sd-1 a semi-dwarfing gene. A total of 15 QTL were detected at the two developmental stages, of which only three QTL were common. Region flanked by RG157 and RZ318 (chromosome 2) contained QTL for root thickness under two different developmental stages. In total, 21 QTL for different traits were detected under low-moisture stress condition. While two QTL for plant height on chromosomes 1 and 3 were common, none of the loci for root morphological traits was common between the two different moisture regimes. The chromosomal segment between RG171 and RG157 contained QTL controlling tiller number per plant, total root length, root volume and total root number per plant. Absence of common QTL for root traits between two developmental stages and two moisture regimes suggests the existence of parallel genetic pathways operating at different growth stages and moisture regimes. Root volume and total root number per plant decreased significantly under stress, whereas maximum root length and plant height exhibited non-significant increases under stress.

drought resistance QTL mapping RFLP markers rice root traits vegetative stage 


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Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  • G.S. Hemamalini
    • 1
  • H.E. Shashidhar
    • 1
  • Shailaja Hittalmani
    • 1
  1. 1.Department of Genetics and Plant Breeding, College of AgricultureUniversity of Agricultural Sciences, GKVKBangaloreIndia

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