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rainfed lowland rice - Breeding Rice for Drought-Prone Environments
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Hybrid Rice Contents
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Differetial seeding
Success in CMS line multiplication or growing hybrid seed depends on synchronizing the flowering of the seed parent and the pollen parent. By synchronizing flowering, we mean that the seed and the pollinator parents flower at the same time in the field, even though they may have different growth durations. Synchronizing flowering is important because we want pollen from the B or R line to be available to the A line throughout its flowering period.
Synchronization of flowering can be done in two ways:
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We can adjust the seeding dates of the parents in the seedbed so they flower at the same time in the field. That is called differential seeding. Seeding time always depends on the growth duration of the parents, whether you are multiplying a CMS line or producing hybrid seed.
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We can adjust the flowering date in the field by crop management practices later in the growing season. These are explained in the section on entitled Adjusting flowering date.
