Define 'Grow-out test'. Explain briefly the methods of roguing in seed fields.
A Grow-out Test (GOT) is a post-harvest purity test for seed lots. A representative sample of seeds is grown in the field or greenhouse under controlled conditions to assess its genetic purity, particularly for characteristics like varietal identity, off-type presence, and hybridity. It ensures the seed truly reproduces the intended variety.
Methods of Roguing in Seed Fields:
Roguing is the process of identifying and removing off-type or undesirable plants from seed production fields to maintain genetic purity.
-
Timeliness: Roguing is crucial at specific growth stages when off-type plants are most clearly distinguishable from the desired variety (e.g., seedling stage, flowering stage based on flower color/structure, or maturity based on plant height/ear characteristics).
-
Identification: Plants are identified based on morphological differences (e.g., height, leaf shape, flowering time, maturity, disease symptoms) that deviate from the known characteristics of the pure variety.
-
Complete Removal: It's essential to uproot and completely remove the entire off-type plant, including its roots, to prevent regrowth and especially to avoid pollen contamination during flowering, which could compromise the genetic purity of the harvested seed.
-
Frequency: Roguing is often done multiple times during the crop cycle to catch off-types appearing at different developmental stages.
Answered By:
Similar Questions
Briefly discuss significant features of heterosis and explain the dominance and overdominance hypotheses of heterosis, giving their main features.
Define Marker-Assisted Selection and give suitable examples. Discuss the applications of marker-assisted selection in recurrent selection, gene pyramiding and QTL introgression.
Define cell cycle. Describe different types and phases of cell cycle.
Classify plant mineral nutrients based on biochemical functions. How do excess minerals in the soil limit the plant growth?
Explain mutagenesis with its classification. Discuss briefly the mechanisms of action of alkylating agents and azide mutagens in crop improvement.
What do you mean by Intellectual Property? Discuss the protection of Intellectual Property Rights in reference to patent, plant breeders' rights and copyright.
Why do fruit plants need to be propagated vegetatively? Explain the advantages and disadvantages of asexual and sexual propagation.
Give an account on double haploid and its applications in plant breeding. Also discuss the production methods of haploid.
Explain the functions of plant cell wall in growth, development, maintenance and reproduction of plants.
Define genetic purity. How can the maintenance of genetic purity of varieties be done outside their normal cultivation area?
Important Questions from Miscellaneous
Write a note in 150 words
Mendelian and non-Mendelian traits.Write a note in 150 words
Theoretical significance of Purum kinship-system.Write a note in 150 words
Smell as a signal among non-human primates.Write a note in 150 words
Osteodontokeratik culture and its makers.Discuss the Miocene hominoid remains and their significance in evolution.
