Variation in Morphological Characteristics of Maize Varieties and its Implication in Plant Variety Protection
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Authors
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NGUYEN XUAN THANG
Division of Seed Science and Technology, Indian Agricultural Research Institute, New Delhi 110012
Author
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SK CHAKRABARTY
Division of Seed Science and Technology, Indian Agricultural Research Institute, New Delhi 110012
Author
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M. DADLANI
Division of Seed Science and Technology, Indian Agricultural Research Institute, New Delhi 110012
Author
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S.P. SHARMA
Division of Seed Science and Technology, Indian Agricultural Research Institute, New Delhi 110012
Author
Keywords:
Distinctiveness, Uniformity, Characteristics, Variety, MaizeAbstract
The legislation on “Protection of Plant Varieties and Farmers’ Rights Act (PPV & FR Act)” passed by the Indian Government in 2001, provides for protection and registration of a new variety of plant if it conforms to the criteria of Distinctiveness, Uniformity and Stability (DUS). The National Agricultural Research System (NARS) of India has released a number of maize varieties and hybrids for different agro climatic region. However, assessment of these for DUS characteristics, have not been made. Therefore, ten maize genotypes, comprising inbreds, single, double and three-way crosses and composites were evaluated at Indian Agricultural Research Institute, New Delhi in Kharif season, 2005 following the National DUS Test Guideline. Among these characteristics, expression of two qualitative characteristics, i.e., anthocyanin colouration of leaf sheath and the angle between the leaf blade and stem were found stable and uniform in all genotypes studied. Other characteristics exhibited variable states of expression. Among the genotypes, inbred line193-1 and single cross hybrid Prakash showed the highest level of uniformity and lowest within the population variation for almost all characteristics. Rest of the genotypes including the inbred CM 137 exhibited lesser uniformity, indicating inherent variability in the different states of expression among characteristics. The study provided an assessment of the status of variation in characteristics expression of maize genotypes which are discussed in the light of requirements of variety maintenance and conduct of DUS test for Plant Variety Protection.
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