Influence on the exicision of cotyledons on the content of indole-3-acetic acid, growth and flowering of Lupinus albus plants [IAA].
1980
Elinawy M.
Excision of both cotyledons of Lupinus albus L. (L. termis Forssk.) seedlings at different morphological stages during the first 8 days after sowing, retarded significantly the growth of 16-day-old seedlings and decreased the content of IAA in the shoots. The effect was more obvious at the early excision (4 days after sowing). A pattern similar to that of control plants with intact cotyledons was attained when cotyledons were excised latter than 8 days after sowing. Iis believed that the cotyledons control the IAA content of the shoot during the early stages of development. At day 36 flower primordia were observed in controls but not only in cotyelon-less plants. At this time the IAA content of the shoot apices and the growth of cotyledon-less plants were the same as in controls except for plants that lost cotyledons 4 days after sowing, which showed similar values at week 11, but did not produce flower primordia. The other cotyledon-less plants produced flower primordia 4-11 days after controls. It is postulated that the cotyledons convey certain factor(s) to the developing axis at an early stage of the development which promote flowering.
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