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Influence of the excision of cotyledons on the content of indole‐3‐acetic acid, growth and flowering of Lupinus albus plants
Author(s) -
ELKINAWY MAHASEN
Publication year - 1980
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1980.tb08653.x
Subject(s) - primordium , cotyledon , lupinus , biology , shoot , sowing , indole 3 acetic acid , botany , horticulture , auxin , biochemistry , gene
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 later than 8 days after sowing. It is 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 in cotyledon‐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.