Pollen-Tube Growth in Intergeneric Pollinations on Datura Stramonium

A model for incongruity in intimate partner relationships

“…This agrees with what has actually been found (SANZ, 1945 ;BELLARTZ, 1956 ;LEWIS & CROWE, 1958 ;GRUN, 1961 ;SMITH, 1968) . The conclusion must be that most populations are bilaterally incongruous .…”

An introduction to the embryology of angiosperms

“…107C), and in Aeginetia indica even on the moist surface of the corolla tube. Frequently pollen grains germinate on a foreign stigma, i.e., stigma of a different species (see Eigsti, 1937;Sanz, 1945). If fertilization takes place, it results in the formation of interspecific and intergeneric hybrids.…”

Overcoming Barriers to Crossability Due to Style Length

“…Such conditions are found not only in interspecific crosses but also in gametophytic elimination of both balanced and unbalanced extra-chromosomal types (Buchholz andBlakeslee, 1929, 1932) and of some single gene mutations ("Tricarpel," Buchholz and Blakeslee, 1927). Attempted intergeneric crosses using Datura as the female parent showed similar pollen-tube abnormalities (Sanz, 1945). Buchholz et al (1935) investigated pollen-tube growth in both selfs and crosses of the ten species of Datura, charting the relative numbers of normal and burst pollen tubes and calculating the growth rates.…”

“…method the pollen tubes could cross the splice RESULTS.-By dissecting the base of the D. inoxia sooner and before excessive drying or wound effects style we found that it was possible for the pollen could occur. The two styles were held in place by tubes to bridge the splice in all the crosses and to thin walled glass capillary tubing (Sanz, 1945). grow into and through the base of the style of The diameter of the tubing used for a particular D. inoxia.…”