Response of contrasting root genotypes of castor (Ricinus communis L.) to water stress


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RESPONSE OF CONTRASTING ROOT GENOTYPES OF CASTOR TO WATER STRESS

Authors

  • P LAKSHMAMMA ICAR-Indian Institute of Oilseeds Research, Rajendranagar, Hyderabad-500 030, Telangana
  • LAKSHMI PRAYAGA ICAR-Indian Institute of Oilseeds Research, Rajendranagar, Hyderabad-500 030, Telangana
  • C SARADA ICAR-Indian Institute of Oilseeds Research, Rajendranagar, Hyderabad-500 030, Telangana

https://doi.org/10.56739/jor.v33i4.137865

Keywords:

Castor, Root, Seed yield, Water stress

Abstract

Two contrasting genotypes for root biomass i.e. RG-111 with good root, RG-1520 with poor root were studied for root, shoot growth till 90 DAS in root structures and also in field for seed yield by imposing water stress (30-90 DAS) during late rabi (2011-12). The reduction in root length was less due to stress. But root volume, dry weight and shoot growth reduced with stress and the per cent reduction was less in poorer root genotype (RG-1520) compared to good root genotype (RG-111). With drought stress in field, the growth before relieving stress, seed yield of different order branches and total seed yield reduced significantly in both genotypes. RG-1520 showed adaptation to survive drought stress in root structure and in field by increasing chlorophyll content (SCMR), less reduction in relative water content (RWC), decrease in specific leaf area (SLA) and increase in bloomcontent as that of good root genotype RG-111. But, seed yield reduction was more in poor root genotype (RG-1520) and also recorded high drought susceptibility index (DSI) as its photo assimilates were spent for its survival in stress and assimilate translocation was less for seed growth. Hence good root is important for crop survival, growth and seed yield especially in drought conditions.

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References

DOR 2011. Annual Report 2010-11, Directorate of Oilseeds Research, Rajendranagar, Hyderabad, pp. 10-11.

DOR 2012. Annual Report 2011-12, Directorate of Oilseeds Research, Rajendranagar, Hyderabad, pp. 11-12.

Lakshmamma P and Lakshmi Prayaga 2006. Identifying the sources of tolerance for drought in castor (Ricinus communis L). Journal of Oilseeds Research, 23(2): 348-352.

Lakshmamma P, Lakshmi Prayaga, Lavanya C and Sarada C 2014. Genetic diversity, variability and heritability for root, shoot and water use efficiency traits in castor (Ricinus communis L.) genotypes. Indian Journal of Plant Genetic Resources, 27(3): 230-237.

Lakshmamma P, Lakshmi Prayaga and Alivelu K 2015. Selection of castor (Ricinus communis L.) germplasm with good root traits for drought tolerance in field. Proceedings of 3rd International Plant Physiology Congress on Challenges and Strategies in Plant Biology Research, 11-15 December 2015, New Delhi, pp. 142.

Lynch J P 2007. Roots of the second green revolution. Australian Journal of Botany, 55: 493-512.

Nageshwar Rao R C, Talwar H S and Wright G C 2001. Rapid assessment of specific leaf area and leaf nitrogen in peanut (Arachis hypogaea L.) using a chlorophyll meter. Journal of Agronomy and Crop Science, 186: 175-182.

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Submitted

2023-06-16

Published

2016-12-30

How to Cite

P LAKSHMAMMA, LAKSHMI PRAYAGA, & C SARADA. (2016). Response of contrasting root genotypes of castor (Ricinus communis L.) to water stress: RESPONSE OF CONTRASTING ROOT GENOTYPES OF CASTOR TO WATER STRESS. Journal of Oilseeds Research, 33(4). https://doi.org/10.56739/jor.v33i4.137865