Lateral root initiation

Mepiquat chloride (MC) is a plant growth regulator widely used in cotton (Gossypium hirsutum L.) production to suppress excessive vegetative growth, increase root growth and avoid yield losses.

14p viharuno2711 24-04-2020 20 1   Download

Development of SNPs (Single Nucleotide Polymorphisms) marker is an important step to initiate the molecular breeding and genetic based studies. Identification and validation of polymorphic SNP will be valuable resource for gene tagging through linkage mapping/QTL mapping. In present study, two ecological ecotypes of Arabidopsis thaliana i.e. Col-0 and Don-0 exhibited variation at phenotypic level (leaf, flower, siliques and root related traits) and genotypic level (SNPs). Out of 500 SNPs, total 365 polymorphic SNPs were validated on Sequenome MassARRAY.

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The apical meristem and zone of cell extension of impeded roots is shorter (Barley, 1962; Souty, 1987), and root hairs develop closer to the tip of impeded roots (Goss & Russell, 1980). Lateral initiation occurs nearer the tip and laterals occur together along the impeded axis (Goss & Russell, 1980; Barley, 1962). Where mechanical deflection causes roots to curve around an obstacle, the initiation of laterals generally occurs on the convex side of the root (Goss & Russell, 1980). Root hair development is greater on the opposite (concave) side and, in...

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Mechanical impedance is experienced to varying degrees by virtually all roots growing through soil. If continuous pores of sufficiently large diameter do not already exist, a root tip must exert a force to deform the soil. This process may considerably decrease root elongation rates, increase the root diameter and change the pattern of lateral root initiation (Russell, 1977). In this paper, the effects of mechanical impedance on root morphology are reviewed and some direct comparisons between soil resistance to root growth and resistance to a penetrometer are discussed.

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