Plant Soil Environ., 2011, 57(12):541-546 | DOI: 10.17221/116/2011-PSE

The enhancement of drought tolerance for pigeon pea inoculated by arbuscular mycorrhizae fungi

G. Qiao1, X.P. Wen1, L.F. Yu2, X.B. Ji1
1 Guizhou Key Laboratory of Agricultural Bioengineering, Guizhou University, Guiyang, P.R. China
2 School of Forestry Science, Guizhou University, Guiyang, P.R. China

Pigeon pea (Cajanus cajan) has been rapidly grown in the drought-striken Karst regions of southwest China. Present research aimed to investigate the effects of arbuscular mycorrhizae (AM) on the drought tolerance of pigeon pea, as well as to elucidate the physiological responses of AM-colonized seedlings to the water deficit. As subjected to drought stress, AM symbiosis (AMD) highly led to the positive effects on root system, plant height and stem diameter. AMD demonstrated a remarkably higher chlorophyll content, photosynthetic rate and stomatal conductance. The soluble sugar in AMD was significantly higher than that of the non-AM seedlings (NAMD), indicating the enhanced tolerance at least partially correlated with osmotic solute. Conversely, the proline (Pro) of AMD was lower, revealing the excessive Pro was not imperative for drought tolerance. After 30 days drought stress, AMD gave around a third less lipid peroxides than that of NAMD. Rather, the root activities of AMD were significantly higher than that of the latter after 10 days drought stress. Thereby, AM fungi might substantially elevate the tolerance to drought of pigeon pea, and the cumulative effects contributed to the enhanced tolerance. To date, this has been the first report concerning the enhancement of drought tolerance via AM colonization in this legume species.

Keywords: arbuscular mycorrhizal fungi; drought stress; osmotic solute; photosynthesis; pigeon pea (Cajanus cajan)

Published: December 31, 2011  Show citation

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Qiao G, Wen XP, Yu LF, Ji XB. The enhancement of drought tolerance for pigeon pea inoculated by arbuscular mycorrhizae fungi. Plant Soil Environ. 2011;57(12):541-546. doi: 10.17221/116/2011-PSE.
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