caa a22 4500 477039359 CHVBK 20180405111313.0 cr unu---uuuuu 170330e19960301xx s 000 0 eng 10.1007/BF00989062 doi (NATIONALLICENCE)springer-10.1007/BF00989062 Microgametophytes in flowers with and without fruits of Phlox drummondii ( Polemoniaceae ) [Elektronische Daten] [Uzi Plitmann, Donald Levin] Relationships between microgametophyte numbers per flower and fruit-set were sought inPhlox drummondii Hook. This was accomplished by counting fluorescentstained pollen tubes in flowers with and without fruits in 21 populations, and in flowers subject to either supplemental or sparse pollination, and then determining whether the flowers initiate fruits. There was a conspicuous variation in mean pollen tubes per flower (3-38) and in percent fruit-set (17%-92%) among populations. Neighboring populations often differed strikingly in these respects. Flowers with fruits had an average of 15.2 pollen tubes per stigma whereas those without had an average of 3 7 tubes. Over all flowers, there was a mean of 3.7 tubes per ovule. There was a strong correlation between mean tube number within populations and their percent fruit-set (r = 0.86). Supplemental pollination significantly enhanced fruit-set, thereby supporting the notion that fruit-set was pollen-limited in most populations. In both natural and artificial pollinations a portion of flowers without fruits still had several pollen tubes. The occurrence of fruitless flowers containing tubes is explained by attrition factors, like late-acting pollen-pistil incompatibility, and resource limitation. Fruit-set could be initiated with one pollen tube, but this rarely occurred in nature. Higher pollen loads were accompanied by higher percents of fruit-set and number of seeds per flower. Springer-Verlag, 1996 Polemoniaceae nationallicence Phlox drummondii nationallicence Microgametophytes nationallicence pollen tube numbers nationallicence fruit-set nationallicence seed-set nationallicence Plitmann Uzi The Hebrew University, 91904, Jerusalem, Israel aut Levin Donald Department of Botany, University of Texas at Austin, Texas, USA aut Plant Systematics and Evolution Springer-Verlag 201/1-4(1996-03-01), 211-221 0378-2697 201:1-4<211 1996 201 606 https://doi.org/10.1007/BF00989062 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00989062 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Plitmann Uzi The Hebrew University, 91904, Jerusalem, Israel aut NATIONALLICENCE 700 1- Levin Donald Department of Botany, University of Texas at Austin, Texas, USA aut NATIONALLICENCE 773 0- Plant Systematics and Evolution Springer-Verlag 201/1-4(1996-03-01), 211-221 0378-2697 201:1-4<211 1996 201 606 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer