2. Materials and methods
2.1. Plant materials
Hybrid seeds were produced by crossing a high yielding, drought and stem canker tolerant cultivar (TRI 3013-female parent), with a moderate yielding and nematodes tolerant cultivar (DT 95-male parent). Anthers were collected from unopened flower buds and vials containing pollens were kept overnight in a desiccator to enhance anther dehiscence. On following day morning, sepals and petals of the unopened mature flower buds were removed, emasculated and pollen was dusted onto the stigma of TRI 3013 flowers using a camel hair brush. The pollinated buds were tagged with a reference number and covered with a cloth bag. After 3 days, cloth bags were removed and net bags were attached to ensure collection of mature seeds from fruits. Seeds fallen into net bags were collected at the time of fruit dehiscence (9 months after pollination).
The collected seeds were disinfected with 20% NaOCl (Sigma, USA) and embryos were regenerated on MS solid medium supplemented with 3 mg L−1 BAP, 0.5 mg L−1 IBA, 8 g L−1 Agar and 30 g L−1 sucrose (Multiplication Medium, Gunasekare and Evans, 2000). The pH of the medium was adjusted to 5.8 before autoclaving. The cultures were incubated at 25 °C and 15 h light duration. Regenerated micro-shoots were multiplied 4 times by sub culturing onto multiplication medium at 8 week intervals until the required amount of micro-shoots were produced.
2. Materials and methods2.1. Plant materialsHybrid seeds were produced by crossing a high yielding, drought and stem canker tolerant cultivar (TRI 3013-female parent), with a moderate yielding and nematodes tolerant cultivar (DT 95-male parent). Anthers were collected from unopened flower buds and vials containing pollens were kept overnight in a desiccator to enhance anther dehiscence. On following day morning, sepals and petals of the unopened mature flower buds were removed, emasculated and pollen was dusted onto the stigma of TRI 3013 flowers using a camel hair brush. The pollinated buds were tagged with a reference number and covered with a cloth bag. After 3 days, cloth bags were removed and net bags were attached to ensure collection of mature seeds from fruits. Seeds fallen into net bags were collected at the time of fruit dehiscence (9 months after pollination).The collected seeds were disinfected with 20% NaOCl (Sigma, USA) and embryos were regenerated on MS solid medium supplemented with 3 mg L−1 BAP, 0.5 mg L−1 IBA, 8 g L−1 Agar and 30 g L−1 sucrose (Multiplication Medium, Gunasekare and Evans, 2000). The pH of the medium was adjusted to 5.8 before autoclaving. The cultures were incubated at 25 °C and 15 h light duration. Regenerated micro-shoots were multiplied 4 times by sub culturing onto multiplication medium at 8 week intervals until the required amount of micro-shoots were produced.
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