1032378456

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AID: 1032378456
Английский
APR 1
APRm
Reproductive Characterization and Preliminary Studies on Controlled Breeding of Annatto (Bixa orellana L.)
Plant Systematics and Evolution, . V. 298. No. 1. P. 239250 (12).
Annatto (Bixa orellana L.) is an important dye-yielding medium-sized tree occurring in the tropics. Investigations aimed at elucidating the reproductive characters as well as establishing a set of breeding parameters for genetic improvement of B. orellana was carried out. Records on pollen/ovule ratios of annatto showed that this species is xenogamous. The acetolyzed pollen of B. orellana was tricolporate. The fluorochromatic test showed 95% pollen viability. The viability of the pollen grains decreased sharply after 4 h from anther dehiscence. The optimum time range for artificial pollination was standardized between 12:00 and 13:00 h. A high in vitro germination rate (92%) of freshly collected pollen was recorded in modified Brewbaker’s medium with 15% sucrose. Resource allocation studies showed that the construction of each flower cost 1.162 g. The floral vegetative cost was 75%. Of the total allocation, 21% was spent by the stamens. Based on identified reproductive characters, controlled pollination experiments were conducted by selecting four morphologically distinct parent plants: (1) green-fruited with reddish spines, (2) red-fruited, (3) brown large-fruited, and (4) with brown distorted fruits. In artificial cross-pollination experiments, wide variation ranges in fruit set (0–95%) and fruit maturation (0–85%) were observed in different crosses. The number of seeds per capsule also showed variation (0–40 per capsule). Germination studies of seeds raised from different crosses showed a maximum 93% germination. The present study proved that improvement in B. orellana could be achieved by adopting breeding techniques using specifically selected parents.
Ключевые словаPollen viability, In vitro pollen germination, Resource allocation, Controlled pollination
Таксоны растенийBixa orellana, Bixa

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