Quality Rice Seed

Quality Rice Seed

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Production of Rice Seed in Irrigated Environments btn_backbtn_forward
Roguing during rice seed production
To understand the importance of roguing to maintain genetic purity.
Roguing is the removal of all off-types or mixtures of plants. Roguing in any seed production plot is extremely important to prevent pollen from off-type plants causing irreparable damage to the crop through cross-pollination.

Plants with heterogeneous characters in a seed production plot are off-types. Sources of off-types are:

Off-types can be identified by observing the characteristics of plants:

  • Plants taller or shorter than most of the population
  • Plants with different color leaves, sheaths or straw
  • Presence or absence of awns: if the existence of awns in a plant is different from the rest of the population, it is an off-type
  • Plants with earlier or later panicle emergence are off-types: Only plants that flower within 2-3 days should be kept
  • Angle of the lag leaf: If erect flag leaves are dominant in a crop, then horizontal or droopy leaves are off-types.
  • Inconsistent size, shape or color of grains: If most of the panicles have long grains then those with medium grains are off-types. If slender grains are dominant, then blood grains are off types
  • Diseased- or insect-damaged plants.
Timing Roguing should be done continuously over the whole growing season whenever off-types are noticed. A special emphasis is needed during the period from panicle emergence to early seed development.

Next lesson Disease and pest management is discussed in the next lesson. btn_backbtn_forward
Last Updated on Wednesday, 09 March 2016 13:00  

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