I know very little about cotton.  Extrafloral nectar production is
apparently from the bracts on the bottom of the flower head.  See below
("anthesis" is the actual flowering).  This extrafloral nectar production is
apparently controlled by a couple of genes, so not surprised if it has been
bred out.

Bracteal nectar production shows a distinct peak on the day of anthesis,
followed by a prolonged secretion during fruit maturation. This suggests
that bracteal nectaries function in pollination as well as defense.
Constitutive nectar production at the bracteal nectaries exceeds foliar
nectar secretion by a factor of between 80 and 110.  Wäckers, Felix L., and
Claire Bonifay. 2004. HOW TO BE SWEET? EXTRAFLORAL NECTAR ALLOCATION BY
GOSSYPIUM HIRSUTUM FITS OPTIMAL DEFENSE THEORY PREDICTIONS. Ecology
85:1512–1518. [doi:10.1890/03-0422]

Randy Oliver

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