An efficient in vitro regeneration protocol for Tagetes minuta
1998
Mohamed, M.A.H. | Harris, P.J.C. | Henderson, J.
Tagetes minuta is a source of secondary products which are used as pharmaceuticals, pesticides and as flavour components in the food industry. Cotyledons and hypocotyls of T. minuta were cultured on MS medium with combinations of IAA or NAA and BA. Hypocotyl-derived callus developed adventitious shoots which failed to develop further. Cotyledon-derived callus, cultured on medium with IAA, regenerated adventitious shoots which developed into plantlets on MS medium or half-strength MS with 2.85 micromolar IAA. Cotyledons cultured on medium with 5.71 micromolar IAA + 44.4 micromolar BA and transferred to MS medium for shoot growth yielded the highest number of shoots. Nodal segments from developing shoots were micropropagated on half-strength MS medium with 2.58 micromolar IAA and 95% of plantlets produced adapted successfully to greenhouse conditions. In vitro plants micropropagated from nodes had many shoots whereas plants regenerated from shoot tips had only a single main stem. This difference in morphology was retained after two months growth in a greenhouse. There were no significant differences in leaf and shoot fresh and dry weights among the regenerated plants after two months growth. After six subcultures of cotyledon-derived callus on medium with IAA and BA all explants lost their ability to regenerate except those cultured on medium with 17.23 micromolar IAA and 44.4 micromolar BA. The methods of regeneration developed will facilitate selection of T. minuta plants more tolerant of environmental stress, their micropropagation, and the in vitro production of secondary products.
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