Preferential reproduction mode of hermaphrodite papaya plant (Carica papaya L; Caricaceae)

This research was done to study the reproductive system of papaya hermaphrodite plant based on the histochemical nature of pollen grain, stigma receptivity, in vivo pollen grain germination and pollen:ovule ratio. In the histochemical analysis, pollen grains were stained by using Sudan IV and I2KI solution ; the stigma receptivity was assessed by alpha-naphthtyl acetate solution in closed and opened flowers. Pollen germination and pollen tube growing were examined in flower buds near anthesis with 0.1% aniline blue. To estimate the pollen:ovule ratio , anthers from each flower bud were dissected and all pollen grains were counted; ovules were dissected from ovaries and were counted under stereomicroscope. The results indicated that papaya pollen grains are of lipidic nature; the stigmas were receptive before the opening and until 48 hours after opening; the pollen grains germinated and emitted polinic tube before flower opening and the pollen:ovule ratio indicated the predominance of autogamous reproductive system. These results indicate that hermaphrodite papaya trees is preferentially of optional autogamous with cleistogamy.

Bibliographic Details

Main Authors:	Damasceno junior,Pedro Corrêa, Pereira,Telma Nair Santana, Pereira,Messias Gonzaga, Silva,Francisco Filho da, Souza,Margarete de Magalhães, Nicoli,Rodrigo Gualandi
Format:	Digital revista
Language:	English
Published:	Sociedade Brasileira de Fruticultura 2009
Online Access:	http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452009000100025
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