Two representative cultivars of
Cicer arietinum, the desi-type cv.Annigeri and the kabuli-type cv.ICCV6, were regenerated in vitro and clonally propagated from cotyledonary
nodes and meristem tips. The explants were dissected from 1-wk-old seedlings aseptically germinated on WH medium. In both
cultivars, all nodes cultured on B5 medium supplemented with 4.4
µM 6-benzylaminopurine developed up to seven shoots per node within 3 wk. Meristem tips were much better suited for multiple
shoot formation. Cultured on DKW-C-a medium supplemented with 4.4
µM 6-benzylaminopurine and 0.05
µM indole-3-butyric acid, 96% of the meristem tips produced up to 10 shoots per explant. A new method in improving clonal propagation
was subdividing the meristem tips. Doing so, multiple shoot formation was considerably enhanced: up to 90 shoots per original
explant could be obtained with cv.Annigeri, and up to 50 with cv.ICCV6. Indole-3-butyric acid proved to be the best rooting
factor. From several media tested, the best root induction and development was achieved on WH medium supplemented with 2.5
µ M indole-3-butyric acid: 72% rooting with cv.Annigeri and 68% rooting with cv.ICCV6. With both cultivars there were no differences
in rooting capacity between shoots of nodal origin and those derived from meristem tips. The plantlets obtained were transferred
into soil and kept under greenhouse conditions. The survival frequency was 28% with cv.Annigeri and 23% with cv.ICCV6. R
0 plants remained smaller than seed-grown controls and produced only a few fertile seeds. There was no difference between R
1 plants and controls in growth, development, and seed set.
Key words chickpea -
Cicer arietinum
- cotyledonary nodes - micropropagation - in vitro regeneration - meristem tips