IAA is present in seeds during germination as a result of the
breakdown of its conjugated forms with sugars, amino acids and
peptides [26]. Lectins are abundant in seeds, especially in the
protein bodies of cotiledonary cells, although, like ConA, they may
also be present in the cytoplasm [60]. Studies of germination in
some legume seeds demonstrated that the lectin content increases
during germination and early seedling stages [61,62]. Taking these
data into account, as well as the facts described in the previous
paragraph, we hypothesize that the ability of ConM to interact with
IAA may be a strategy to render the phytohormone unavailable to
the cell to protect radicles from its inhibitory activity. Thus, this
new physiological role proposed for legume lectins might be a
novel mechanism, in addition to the destruction and formation of
new complexes, by which IAA levels can be decreased in the later
stages of seed germination [63,64].
IAA is present in seeds during germination as a result of thebreakdown of its conjugated forms with sugars, amino acids andpeptides [26]. Lectins are abundant in seeds, especially in theprotein bodies of cotiledonary cells, although, like ConA, they mayalso be present in the cytoplasm [60]. Studies of germination insome legume seeds demonstrated that the lectin content increasesduring germination and early seedling stages [61,62]. Taking thesedata into account, as well as the facts described in the previousparagraph, we hypothesize that the ability of ConM to interact withIAA may be a strategy to render the phytohormone unavailable tothe cell to protect radicles from its inhibitory activity. Thus, thisnew physiological role proposed for legume lectins might be anovel mechanism, in addition to the destruction and formation ofnew complexes, by which IAA levels can be decreased in the laterstages of seed germination [63,64].
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