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How is the relationship between the C4 cereal Sorghum bicolor and the C3 root hemi-parasites Striga hermonthica and Striga asiatica affected by elevated CO2?


, : How is the relationship between the C4 cereal Sorghum bicolor and the C3 root hemi-parasites Striga hermonthica and Striga asiatica affected by elevated CO2?. Plant Cell & Environment 20(10): 1292-1300, Oct

The C4 cereal Sorghum bicolor was grown under either ambient (350 mumol mol-1) or elevated (700 mumol mol-1) (CO2) in either the presence or absence of the C3 obligate root hemi-parasites Striga hermonthica or S. asiatica. Both uninfected and infected sorghum plants were taller and had greater biomass, photosynthetic rates, water-use efficiencies and leaf areas under elevated compared with ambient (CO2). There was no evidence of any downregulation of photosynthesis in sorghum grown at elevated (CO2). Biomass of infected sorghum was lower under both ambient and elevated (CO2), and although infected plants were larger under elevated (CO2) the relative impact of infection on host biomass was either the same (S. asiatica) or only slightly less (S. hermonthica) than under ambient (CO2). In contrast, biomass of S. hermonthica and S. asiatica per host was lower under elevated than ambient (CO2), although rates of photosynthesis were higher at elevated (CO2) and parasite stomatal conductance was not responsive to (CO2). Parasites emerged above-ground and flowered earlier under ambient compared with elevated (CO2). It appears that the mechanism(s) by which the parasites affect host growth is (are) relatively insensitive to increased atmospheric (CO2), although the parasites themselves were adversely affected by growth at elevated (CO2).

Accession: 003162478

DOI: 10.1046/j.1365-3040.1997.d01-19.x

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Related references

Watling, J.R.; Press, M.C., 1997: How does elevated CO-2 affect the relationship between the C-3 root hemiparasite Striga hermonthica and the C-4 host Sorghum bicolor?. Plant Physiology (Rockville) 114(3 SUPPL ): 27

Kulkarni N.; Shinde V.K., 1985: Genetic analysis of striga resistance in sorghum sorghum bicolor stability of yield and its components with and under striga striga asiatica stress. Stability parameters for grain yield and yield components in sorghum were studied by evaluating seven-parents and 42 crosses under low and normal fertility with and without striga infestation. G .times. E (linear) interaction was significant for a...

Ogunlela, Vb, 1983: Striga, fertilizer application and hybrid sorghum performance in the Nigerian savanna Striga hermonthica, Sorghum bicolor. Zeitschrift fur Acker und Pflanzenbau = Journal of agronomy and crop science 152(3): 208-218

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