000			01601nam a2200253Ia 4500
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100			_aCarron M P
245		0	_aCompared root system architectures in seedlings and in vitro plantlets of Hevea brasiliensis, in the initial years of growth in the field
260			_bPlant and Soil _c2000
300			_a73-85
520			_aIn vitro culture of Hevea was undertaken to propagate selected clones on their own roots. The challenge was to overcome the failure of cuttings due to the poor conformity of regenerated root systems. Trees of several juvenile or mature genotypes were propagated either by in vitro microcutting, or by somatic embryogenesis, and planted in the field. Certain static and dynamic components of the root system were observed at different growth stages, from 0 to 3 years, and compared to those of seedlings of the same age used in the trial as a reference. A simple method was designed for measuring the vigour and balance of the root system. The in vitro plantlets had a well-developed taproot and lateral root system, with an architecture similar to that of plants obtained from seed. Moreover, clear differences occurred between selected clones for the relative vigour of the tap roots, lateral roots and trunk.
650			_aField trial
650			_aHevea brasiliensis
650			_aMicrocutting
650			_aRubber tree
650			_aSomatic embryogenesis
700			_aCaussanel V
700			_aClair J
700			_aDea B G
700			_aKeli J
700			_aLe Roux Y
700			_aTison J
942			_cJS
999			_c55979 _d55979