Morfologia polínica de espécies das tribos Ipomoeeae Hallier f. e Merremieae D.F. Austin (Convolvulaceae) ocorrentes numa região de ecótono do município de Caetité, BA, Brasil

Abstract

-(Pollen morphology of species from tribes Ipomoeeae Hallier f. and Merremieae D.F. Austin, Convolvulaceae, occurring in an ecotonal region of the municipality of Caetité, Bahia State, Brazil). This pollen morphology study of species of the tribes Ipomoeeae and Merremieae (Convolvulaceae) aims to contribute to the knowledge of palynology of the taxa studied and to the taxonomy of the group. Ten species of Ipomoea, one of Turbina (Ipomoeeae tribe), and four species of Merremia (Merremieae tribe) occurring in the flora of the Brejinho das Ametistas, Caetité, Bahia State, Brazil were examined. The pollen grains were acetolysed, measured, described, and illustrated under light microscopy (LM) and scanning electron (SEM) microscopy. By analyzing the pollen morphology of the taxa studied, it was possible to confirm the euripollinic character of the group and to recognize two pollen types based upon the apertural type and the exine ornamentation: 1) pantoporate, echinate pollen grain; 2) 3-6-colpate, microechinate, granulate pollen grain.

Pollen Morphology of Convolvulaceae from Southeastern Amazonian Cangas and Its Relevance for Interaction Networks and Paleoenvironmental Studies

“…The main differences between D. macrocalyx and Operculina hamiltonii are the size and shape, where D. macrocalyx has large and subprolate pollen grains, while O. hamiltonii has very large pollen grains with a spheroidal prolate shape. These findings corroborate with [ 61 ] and [ 42 ], but differ from those findings reported by [ 62 ], specifically related to D. macrocalyx (prolate grains). According to [ 26 ], 4-colpate pollen grains are found in D. macrocalyx , a characteristic that was not observed in the studied grains.…”

“…The nine Ipomoea species analyzed exhibit pollen grains with semitectate to tectate, pantoporate, and echinate exine, which corroborates the descriptions in several studies [ 20 , 21 , 24 , 26 , 42 , 47 , 48 , 49 , 52 , 53 , 54 , 56 ].…”

“…Distimake macrocalyx has been erroneously described with psilate ornamentation [ 46 ]. In the SEM analysis, granulate and microreticulate exines were observed [ 60 ], which were classified as granules by [ 42 ]. D. macrocalyx has been described as having distally branched columellae [ 22 ].…”

“…In the morphometric description, the data were organized in the following sequence: minimum value (standard deviation) and maximum value. For echinae, the classification was adapted from [ 42 ]: conical; bulbous with apiculate apex (type 1); bulbous with rounded apex (type 2); and bulbous with bulbous apex (type 3).…”

Pollen Morphology of Convolvulaceae From Serra Dos Carajás, Southeastern Amazonia

“…The nine Ipomoea species analyzed exhibit pollen grains with semitectate to tectate, pantoporate, and echinate exine, which corroborates the descriptions in several studies [20,21,24,26,42,[47][48][49][52][53][54]56].…”