viabilidade do pÓlen em variedades de laranja doce pollen viability in sweet orange varieties
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Abstract
Pollination is one of the most critical points in fruit growth and development, contributing with male gametes for fertilization and determine, greatly, fruit setting in citrus. It is necessary to evaluate male sterility in sweet orange varieties for their possible use in breeding programs. The sterility limits sexual hybridization, but on the other hand, it has economic importance in leading to fewer seeds per fruit in some citrus varieties. In order to characterize 44 sweet orange varieties (Citrus sinensis [L.] osbeck) for pollen viability, anthers were collected from the varieties grafted on Cleopatra mandarin. The varieties investigated represented the major sweet orange groups: acidic oranges (as 'Pera' orange), low acidic oranges (as 'Lima' orange), navel oranges (as 'Bahia' orange) and bloody oranges (as 'Rubi Blood' orange). The percent of viable pollen was evaluated using acetic carmine stain under optic microscopy. The values ranged from 12.0% for 'Pera Sem Sementes' orange to 88.8% for 'Hamlin Reserva' orange. The 'Hamlin' clones showed the largest percent of viable pollen. Absence of pollen in navel oranges, originated from 'Bahia' variety was observed. The varieties 'Pera', 'Valência' and 'Natal', which are the main sweet orange cultivars in São Paulo State and Brazil, presented low percent of viable pollen.
| Reference Key |
domingues1999scientiaviabilidade
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| Authors | ;Edson Tobias Domingues;Augusto Tulmann Neto;Joaquim Teófilo Sobrinho |
| Journal | journal of the iranian chemical society |
| Year | 1999 |
| DOI |
10.1590/S0103-90161999000200002
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