Genotypic and Environmental Variation in Nodal Root Growth of Post-rainy Season (Rabi) Sorghum

Soman, P and Seetharama, N (1992) Genotypic and Environmental Variation in Nodal Root Growth of Post-rainy Season (Rabi) Sorghum. Experimental Agriculture, 28 (3). pp. 331-341. ISSN 0014-4797

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Rapid initiation and growth of nodal roots (NR) are critical for the establishment of post-rainy season (rabi) sorghums grown in drying soil. The growth of NR was studied in sorghum in the field when sown at different depths in order to vary the crown depth, when different levels of irrigation water were applied to create different moisture contents in the topsoil, and in a number of cultivars to assess genotypic variability. Variation in sowing depth did not result in differences in NR growth, partly because of the capacity of sorghum to vary the mesocotyl length, which brought the crown to approximately the same depth. Different soil moisture levels in the field affected the elongation rate of NR, but not their initiation. Genotypic variation existed in the thermal time required for NR initiation and rate of elongation. The variation in NR growth was independent of the variation in shoot growth. The genotypic variability in NR growth offers an opportunity for combining root-related traits with useful agronomic characters

Item Type: Article
Subjects: Mandate crops > Sorghum
Others > Genetics and Genomics
Depositing User: Mr B K Murthy
Date Deposited: 15 Apr 2014 09:51
Last Modified: 15 Apr 2014 09:51
Official URL:
Acknowledgement: UNSPECIFIED
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